diff --git a/Cargo.lock b/Cargo.lock
index 5f98a977d..1477e28a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -453,6 +453,7 @@ dependencies = [
  "objc2-metal",
  "objc2-metal-kit",
  "objc2-model-io",
+ "objc2-quartz-core",
 ]
 
 [[package]]
diff --git a/crates/header-translator/src/library.rs b/crates/header-translator/src/library.rs
index 1d4435bec..708cc7126 100644
--- a/crates/header-translator/src/library.rs
+++ b/crates/header-translator/src/library.rs
@@ -232,6 +232,12 @@ impl Library {
             )?;
             writeln!(lib_rs, "//! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html")?;
             writeln!(lib_rs, "#![no_std]")?;
+            if !self.data.is_library {
+                writeln!(
+                    lib_rs,
+                    "#![cfg_attr(feature = \"unstable-darwin-objc\", feature(darwin_objc))]"
+                )?;
+            }
             writeln!(lib_rs, "#![cfg_attr(docsrs, feature(doc_auto_cfg))]")?;
             writeln!(lib_rs, "// Update in Cargo.toml as well.")?;
             writeln!(
@@ -447,6 +453,20 @@ see that for related crates.", self.data.krate)?;
             cargo_toml["features"][feature] = array_with_newlines(enabled_features);
         }
 
+        // Emit unstable-darwin-objc feature in framework crates.
+        //
+        // We could also use this to enable the feature automatically in
+        // dependencies, but we'd like for this feature to remain "unstable" in
+        // the sense that we'd be free to remove it in a patch release. By
+        // mentioning it across crates, that would no longer be the case.
+        //
+        // It's slightly less convenient for users, but in practice, most users
+        // already directly depend on all their `objc2-*` crates in their
+        // dependency tree.
+        if !self.data.is_library {
+            cargo_toml["features"]["unstable-darwin-objc"] = array_with_newlines([]);
+        }
+
         // And then the rest of the features.
         if !emitted_features.is_empty() {
             add_newline_at_end(&mut cargo_toml["features"]);
diff --git a/crates/objc2/Cargo.toml b/crates/objc2/Cargo.toml
index 54dba5d3a..2e95fae70 100644
--- a/crates/objc2/Cargo.toml
+++ b/crates/objc2/Cargo.toml
@@ -72,7 +72,7 @@ disable-encoding-assertions = []
 # no longer required.
 verify = []
 
-# Make the `sel!` macro look up the selector statically.
+# Make the `sel!`/`class!` macro look up the item statically.
 #
 # The plan is to enable this by default, but right now we are uncertain of
 # its stability, and it might need significant changes before being fully
@@ -85,6 +85,9 @@ unstable-static-sel-inlined = ["unstable-static-sel"]
 unstable-static-class = ["dep:objc2-proc-macros"]
 unstable-static-class-inlined = ["unstable-static-class"]
 
+# Augment the above with the nightly `darwin_objc` feature.
+unstable-darwin-objc = []
+
 # Uses nightly features to make autorelease pools fully sound
 unstable-autoreleasesafe = []
 
diff --git a/crates/objc2/src/__macros/class.rs b/crates/objc2/src/__macros/class.rs
index c4955fdfd..50954e9a9 100644
--- a/crates/objc2/src/__macros/class.rs
+++ b/crates/objc2/src/__macros/class.rs
@@ -89,6 +89,23 @@ macro_rules! __class_inner {
     }};
 }
 
+#[doc(hidden)]
+#[macro_export]
+#[cfg(all(
+    feature = "unstable-static-class",
+    feature = "unstable-darwin-objc",
+    not(feature = "gnustep-1-7"),
+))]
+macro_rules! __class_inner {
+    ($name:expr, $_hash:expr) => {{
+        let ptr = $crate::__macros::core_darwin_objc::class!($name);
+        let ptr = ptr.cast_const().cast::<$crate::runtime::AnyClass>();
+        #[allow(unused_unsafe)]
+        let r: &'static $crate::runtime::AnyClass = unsafe { &*ptr };
+        r
+    }};
+}
+
 #[doc(hidden)]
 #[macro_export]
 #[cfg(all(
@@ -175,6 +192,7 @@ macro_rules! __statics_class {
 #[macro_export]
 #[cfg(all(
     feature = "unstable-static-class",
+    not(feature = "unstable-darwin-objc"),
     not(feature = "gnustep-1-7"),
     not(feature = "unstable-static-class-inlined")
 ))]
@@ -199,6 +217,7 @@ macro_rules! __class_inner {
 #[macro_export]
 #[cfg(all(
     feature = "unstable-static-class",
+    not(feature = "unstable-darwin-objc"),
     not(feature = "gnustep-1-7"),
     feature = "unstable-static-class-inlined"
 ))]
diff --git a/crates/objc2/src/__macros/mod.rs b/crates/objc2/src/__macros/mod.rs
index 90253c10c..9aab4d39f 100644
--- a/crates/objc2/src/__macros/mod.rs
+++ b/crates/objc2/src/__macros/mod.rs
@@ -52,6 +52,9 @@ pub use core::primitive::{bool, isize, str, u8};
 pub use core::{compile_error, concat, env, module_path, panic, stringify};
 pub use std::sync::Once;
 
+#[cfg(feature = "unstable-darwin-objc")]
+pub use core::os::darwin::objc as core_darwin_objc;
+
 pub use self::available::{is_available, AvailableVersion, OSVersion};
 pub use self::class::{disallow_in_static, CachedClass};
 pub use self::convert::{ConvertArgument, ConvertArguments, ConvertReturn, TupleExtender};
diff --git a/crates/objc2/src/__macros/sel.rs b/crates/objc2/src/__macros/sel.rs
index 580359226..3917a1c97 100644
--- a/crates/objc2/src/__macros/sel.rs
+++ b/crates/objc2/src/__macros/sel.rs
@@ -49,13 +49,26 @@ use crate::runtime::Sel;
 /// - runtime, causing UB (unlikely)
 ///
 /// The `"unstable-static-sel-inlined"` feature is the even more extreme
-/// version - it yields the best performance and is closest to real
+/// version - it yield better performance and is closer to real
 /// Objective-C code, but probably won't work unless your code and its
 /// inlining is written in a very certain way.
 ///
 /// Enabling LTO greatly increases the chance that these features work.
 ///
+/// On Apple/Darwin targets, these limitations can be overcome with the
+/// `"unstable-darwin-objc"` feature which uses the nightly-only `darwin_objc`
+/// language feature. This experimental language feature implements the
+/// Objective-C static selector ABI directly in the Rust compiler and should
+/// work in more if not all cases. Using `"unstable-darwin-objc"` requires
+/// `darwin_objc` to be enabled in every crate that uses this macro, which can
+/// be achieved in `objc2` crates by enabling their own
+/// `"unstable-darwin-objc"` features and in your own crates by adding
+/// `#![feature(darwin_objc)]`.
+///
+/// See [rust-lang/rust#145496] for the tracking issue for the feature.
+///
 /// [rust-lang/rust#53929]: https://github.com/rust-lang/rust/issues/53929
+/// [rust-lang/rust#145496]: https://github.com/rust-lang/rust/issues/145496
 ///
 ///
 /// # Examples
@@ -177,9 +190,9 @@ macro_rules! __sel_helper {
     // Base-case
     {
         ($($parsed_sel:tt)*)
-    } => ({
+    } => {
         $crate::__sel_data!($($parsed_sel)*)
-    });
+    };
     // Single identifier
     {
         ()
@@ -219,7 +232,6 @@ macro_rules! __sel_data {
         $crate::__macros::concat!(
             $crate::__macros::stringify!($first),
             $(':', $($($crate::__macros::stringify!($rest),)? ':',)*)?
-            '\0',
         )
     };
 }
@@ -232,7 +244,21 @@ macro_rules! __sel_inner {
         static CACHED_SEL: $crate::__macros::CachedSel = $crate::__macros::CachedSel::new();
         #[allow(unused_unsafe)]
         unsafe {
-            CACHED_SEL.get($data)
+            CACHED_SEL.get($crate::__macros::concat!($data, '\0'))
+        }
+    }};
+}
+
+#[doc(hidden)]
+#[macro_export]
+#[cfg(all(feature = "unstable-static-sel", feature = "unstable-darwin-objc"))]
+macro_rules! __sel_inner {
+    ($data:expr, $_hash:expr) => {{
+        let ptr = $crate::__macros::core_darwin_objc::selector!($data);
+        let ptr = ptr.cast_const().cast::<$crate::__macros::u8>();
+        #[allow(unused_unsafe)]
+        unsafe {
+            $crate::runtime::Sel::__internal_from_ptr(ptr)
         }
     }};
 }
@@ -245,7 +271,7 @@ macro_rules! __statics_sel {
         ($data:expr)
         ($hash:expr)
     } => {
-        const X: &[$crate::__macros::u8] = $data.as_bytes();
+        const X: &[$crate::__macros::u8] = $crate::__macros::concat!($data, '\0').as_bytes();
 
         /// Clang marks this with LLVM's `unnamed_addr`.
         /// See rust-lang/rust#18297
@@ -321,7 +347,8 @@ macro_rules! __statics_sel {
 #[macro_export]
 #[cfg(all(
     feature = "unstable-static-sel",
-    not(feature = "unstable-static-sel-inlined")
+    not(feature = "unstable-darwin-objc"),
+    not(feature = "unstable-static-sel-inlined"),
 ))]
 macro_rules! __sel_inner {
     ($data:expr, $hash:expr) => {{
@@ -353,7 +380,11 @@ macro_rules! __sel_inner {
 
 #[doc(hidden)]
 #[macro_export]
-#[cfg(feature = "unstable-static-sel-inlined")]
+#[cfg(all(
+    feature = "unstable-static-sel",
+    not(feature = "unstable-darwin-objc"),
+    feature = "unstable-static-sel-inlined",
+))]
 macro_rules! __sel_inner {
     ($data:expr, $hash:expr) => {{
         $crate::__statics_sel! {
@@ -425,22 +456,22 @@ impl CachedSel {
 
 #[inline]
 pub fn alloc_sel() -> Sel {
-    __sel_inner!("alloc\0", "alloc")
+    __sel_inner!("alloc", "alloc")
 }
 
 #[inline]
 pub fn init_sel() -> Sel {
-    __sel_inner!("init\0", "init")
+    __sel_inner!("init", "init")
 }
 
 #[inline]
 pub fn new_sel() -> Sel {
-    __sel_inner!("new\0", "new")
+    __sel_inner!("new", "new")
 }
 
 #[inline]
 pub fn dealloc_sel() -> Sel {
-    __sel_inner!("dealloc\0", "dealloc")
+    __sel_inner!("dealloc", "dealloc")
 }
 
 /// An undocumented selector called by the Objective-C runtime when
@@ -448,7 +479,7 @@ pub fn dealloc_sel() -> Sel {
 #[inline]
 #[allow(dead_code)] // May be useful in the future
 fn cxx_construct_sel() -> Sel {
-    __sel_inner!(".cxx_construct\0", ".cxx_construct")
+    __sel_inner!(".cxx_construct", ".cxx_construct")
 }
 
 /// Objective-C runtimes call `.cxx_destruct` as part of the final `dealloc`
@@ -485,7 +516,7 @@ fn cxx_construct_sel() -> Sel {
 #[inline]
 #[allow(dead_code)] // May be useful in the future
 fn cxx_destruct_sel() -> Sel {
-    __sel_inner!(".cxx_destruct\0", ".cxx_destruct")
+    __sel_inner!(".cxx_destruct", ".cxx_destruct")
 }
 
 #[cfg(test)]
diff --git a/crates/objc2/src/lib.rs b/crates/objc2/src/lib.rs
index 4e5e79104..94ec0b771 100644
--- a/crates/objc2/src/lib.rs
+++ b/crates/objc2/src/lib.rs
@@ -102,6 +102,7 @@
 //! [#203]: https://github.com/madsmtm/objc2/issues/203
 
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(
     feature = "unstable-autoreleasesafe",
     feature(negative_impls, auto_traits)
diff --git a/examples/app/Cargo.toml b/examples/app/Cargo.toml
index 162a029ff..6ca949031 100644
--- a/examples/app/Cargo.toml
+++ b/examples/app/Cargo.toml
@@ -18,6 +18,13 @@ path = "default_xcode_app/main.rs"
 name = "hello_world_app"
 path = "hello_world_app.rs"
 
+[features]
+unstable-darwin-objc = [
+    "objc2/unstable-darwin-objc",
+    "objc2-app-kit/unstable-darwin-objc",
+    "objc2-foundation/unstable-darwin-objc",
+]
+
 [dependencies]
 objc2 = "0.6.2"
 objc2-foundation = { version = "0.3.1", default-features = false, features = [
diff --git a/examples/app/default_xcode_app/main.rs b/examples/app/default_xcode_app/main.rs
index c10441846..690a13bab 100644
--- a/examples/app/default_xcode_app/main.rs
+++ b/examples/app/default_xcode_app/main.rs
@@ -3,6 +3,8 @@
 //! Using a Storyboard outside of Xcode is quite involved, so instead, we set
 //! up the entire UI (menubar and window) ourselves.
 
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
+
 use objc2::MainThreadMarker;
 use objc2_app_kit::NSApplication;
 
diff --git a/examples/app/delegate.rs b/examples/app/delegate.rs
index c86d8641b..6ffc67540 100644
--- a/examples/app/delegate.rs
+++ b/examples/app/delegate.rs
@@ -1,5 +1,6 @@
 //! Implementing `NSApplicationDelegate` for a custom class.
 #![deny(unsafe_op_in_unsafe_fn)]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 use objc2::rc::Retained;
 use objc2::runtime::ProtocolObject;
 use objc2::{define_class, msg_send, DefinedClass, MainThreadMarker, MainThreadOnly};
diff --git a/examples/app/hello_world_app.rs b/examples/app/hello_world_app.rs
index 37550a414..ba86653e7 100644
--- a/examples/app/hello_world_app.rs
+++ b/examples/app/hello_world_app.rs
@@ -1,4 +1,5 @@
 #![deny(unsafe_op_in_unsafe_fn)]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 use std::cell::OnceCell;
 
 use objc2::rc::Retained;
diff --git a/examples/audio/Cargo.toml b/examples/audio/Cargo.toml
index c5834da11..b820a1767 100644
--- a/examples/audio/Cargo.toml
+++ b/examples/audio/Cargo.toml
@@ -9,6 +9,12 @@ publish = false
 name = "speech_synthesis"
 path = "speech_synthesis.rs"
 
+[features]
+unstable-darwin-objc = [
+    "objc2/unstable-darwin-objc",
+    "objc2-foundation/unstable-darwin-objc",
+]
+
 [dependencies]
 objc2 = "0.6.2"
 objc2-foundation = { version = "0.3.1", default-features = false, features = [
diff --git a/examples/audio/speech_synthesis.rs b/examples/audio/speech_synthesis.rs
index 8fb773c7b..9ebb6a081 100644
--- a/examples/audio/speech_synthesis.rs
+++ b/examples/audio/speech_synthesis.rs
@@ -12,6 +12,7 @@
 //! Works on macOS >= 10.7 and iOS > 7.0.
 #![deny(unsafe_op_in_unsafe_fn)]
 #![allow(unused_imports)]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 
 use std::thread;
 use std::time::Duration;
diff --git a/examples/metal/Cargo.toml b/examples/metal/Cargo.toml
index 7cbce932d..5be83f2c5 100644
--- a/examples/metal/Cargo.toml
+++ b/examples/metal/Cargo.toml
@@ -13,6 +13,18 @@ path = "triangle/main.rs"
 name = "default_xcode_game"
 path = "default_xcode_game/main.rs"
 
+[features]
+unstable-darwin-objc = [
+    "objc2/unstable-darwin-objc",
+    "objc2-app-kit/unstable-darwin-objc",
+    "objc2-core-foundation/unstable-darwin-objc",
+    "objc2-foundation/unstable-darwin-objc",
+    "objc2-metal-kit/unstable-darwin-objc",
+    "objc2-metal/unstable-darwin-objc",
+    "objc2-model-io/unstable-darwin-objc",
+    "objc2-quartz-core/unstable-darwin-objc",
+]
+
 [dependencies]
 objc2 = "0.6.2"
 dispatch2 = "0.3.0"
@@ -62,6 +74,7 @@ objc2-core-foundation = { version = "0.3.1", default-features = false, features
     "std",
     "CFCGTypes",
 ] }
+objc2-quartz-core = { version = "0.3.1", default-features = false, features = [] }
 
 [target.'cfg(target_os = "macos")'.dependencies]
 objc2-app-kit = { version = "0.3.1", default-features = false, features = [
diff --git a/examples/metal/default_xcode_game/main.rs b/examples/metal/default_xcode_game/main.rs
index b3d1ae6b0..11a321456 100644
--- a/examples/metal/default_xcode_game/main.rs
+++ b/examples/metal/default_xcode_game/main.rs
@@ -7,6 +7,8 @@
 //! NOTE: Using a Storyboard outside of Xcode is quite involved, so instead,
 //! we set up the entire UI (menubar and window) ourselves.
 
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
+
 #[cfg(all(target_os = "macos", target_arch = "aarch64"))]
 use objc2::MainThreadMarker;
 #[cfg(all(target_os = "macos", target_arch = "aarch64"))]
diff --git a/examples/metal/triangle/main.rs b/examples/metal/triangle/main.rs
index 06dba1aa0..f9819fd3f 100644
--- a/examples/metal/triangle/main.rs
+++ b/examples/metal/triangle/main.rs
@@ -2,6 +2,7 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 #![allow(clippy::incompatible_msrv)]
 #![cfg_attr(not(target_os = "macos"), allow(dead_code, unused))]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 
 use core::{cell::OnceCell, ptr::NonNull};
 
diff --git a/examples/testing/Cargo.toml b/examples/testing/Cargo.toml
index 09dd03115..08a8bd453 100644
--- a/examples/testing/Cargo.toml
+++ b/examples/testing/Cargo.toml
@@ -13,6 +13,14 @@ path = "screenshot.rs"
 name = "ui_test"
 path = "ui_test.rs"
 
+[features]
+unstable-darwin-objc = [
+    "objc2/unstable-darwin-objc",
+    "objc2-foundation/unstable-darwin-objc",
+    "objc2-xc-test/unstable-darwin-objc",
+    "objc2-xc-ui-automation/unstable-darwin-objc",
+]
+
 [dependencies]
 objc2 = "0.6.2"
 objc2-foundation = { version = "0.3.1", default-features = false, features = [
diff --git a/examples/testing/screenshot.rs b/examples/testing/screenshot.rs
index 6a3cf4580..d65b0f79c 100644
--- a/examples/testing/screenshot.rs
+++ b/examples/testing/screenshot.rs
@@ -1,4 +1,5 @@
 #![no_main] // Required, we build this with `-bundle`.
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 
 use objc2::{define_class, ClassType, MainThreadOnly};
 use objc2_foundation::ns_string;
diff --git a/examples/testing/ui_test.rs b/examples/testing/ui_test.rs
index d02881b39..17ec9cadb 100644
--- a/examples/testing/ui_test.rs
+++ b/examples/testing/ui_test.rs
@@ -1,4 +1,5 @@
 #![no_main] // Required, we build this with `-bundle`.
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 
 use objc2::{define_class, ClassType, MainThreadOnly};
 use objc2_xc_test::XCTestCase;
diff --git a/examples/webkit/Cargo.toml b/examples/webkit/Cargo.toml
index 52396f603..a2cf23f68 100644
--- a/examples/webkit/Cargo.toml
+++ b/examples/webkit/Cargo.toml
@@ -9,6 +9,14 @@ publish = false
 name = "browser"
 path = "browser.rs"
 
+[features]
+unstable-darwin-objc = [
+    "objc2/unstable-darwin-objc",
+    "objc2-app-kit/unstable-darwin-objc",
+    "objc2-foundation/unstable-darwin-objc",
+    "objc2-web-kit/unstable-darwin-objc",
+]
+
 [dependencies]
 objc2 = "0.6.2"
 objc2-web-kit = { version = "0.3.1", default-features = false, features = [
diff --git a/examples/webkit/browser.rs b/examples/webkit/browser.rs
index fed054957..2c3bfec60 100644
--- a/examples/webkit/browser.rs
+++ b/examples/webkit/browser.rs
@@ -1,6 +1,7 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 #![allow(clippy::incompatible_msrv)]
 #![cfg_attr(not(target_os = "macos"), allow(dead_code, unused))]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 use core::cell::OnceCell;
 
 use objc2::{
diff --git a/framework-crates/objc2-accessibility/Cargo.toml b/framework-crates/objc2-accessibility/Cargo.toml
index df2ce6e91..f46100140 100644
--- a/framework-crates/objc2-accessibility/Cargo.toml
+++ b/framework-crates/objc2-accessibility/Cargo.toml
@@ -69,6 +69,7 @@ bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 AXAudiograph = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-accessibility/src/lib.rs b/framework-crates/objc2-accessibility/src/lib.rs
index a730902b8..17511406e 100644
--- a/framework-crates/objc2-accessibility/src/lib.rs
+++ b/framework-crates/objc2-accessibility/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/accessibility/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-accessibility/0.3.1")]
diff --git a/framework-crates/objc2-accessory-setup-kit/Cargo.toml b/framework-crates/objc2-accessory-setup-kit/Cargo.toml
index 907163bc1..a1f78a5ca 100644
--- a/framework-crates/objc2-accessory-setup-kit/Cargo.toml
+++ b/framework-crates/objc2-accessory-setup-kit/Cargo.toml
@@ -61,6 +61,7 @@ block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-core-bluetooth = ["dep:objc2-core-bluetooth"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 ASAccessory = [
     "bitflags",
diff --git a/framework-crates/objc2-accessory-setup-kit/src/lib.rs b/framework-crates/objc2-accessory-setup-kit/src/lib.rs
index fc416e2eb..262302957 100644
--- a/framework-crates/objc2-accessory-setup-kit/src/lib.rs
+++ b/framework-crates/objc2-accessory-setup-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/accessorysetupkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-accessory-setup-kit/0.3.1")]
diff --git a/framework-crates/objc2-accounts/Cargo.toml b/framework-crates/objc2-accounts/Cargo.toml
index 0bc93093c..d06dac029 100644
--- a/framework-crates/objc2-accounts/Cargo.toml
+++ b/framework-crates/objc2-accounts/Cargo.toml
@@ -44,6 +44,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 ACAccount = ["objc2-foundation/NSString"]
 ACAccountCredential = [
diff --git a/framework-crates/objc2-accounts/src/lib.rs b/framework-crates/objc2-accounts/src/lib.rs
index cd292ceb5..563aa91ed 100644
--- a/framework-crates/objc2-accounts/src/lib.rs
+++ b/framework-crates/objc2-accounts/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/accounts/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-accounts/0.3.1")]
diff --git a/framework-crates/objc2-ad-services/Cargo.toml b/framework-crates/objc2-ad-services/Cargo.toml
index 21a19beee..82d0b2742 100644
--- a/framework-crates/objc2-ad-services/Cargo.toml
+++ b/framework-crates/objc2-ad-services/Cargo.toml
@@ -37,6 +37,7 @@ default = [
 ]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
 
 AAAttribution = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-ad-services/src/lib.rs b/framework-crates/objc2-ad-services/src/lib.rs
index 105ac278b..2764e3381 100644
--- a/framework-crates/objc2-ad-services/src/lib.rs
+++ b/framework-crates/objc2-ad-services/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/adservices/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-ad-services/0.3.1")]
diff --git a/framework-crates/objc2-ad-support/Cargo.toml b/framework-crates/objc2-ad-support/Cargo.toml
index 8578c0a20..e755f056a 100644
--- a/framework-crates/objc2-ad-support/Cargo.toml
+++ b/framework-crates/objc2-ad-support/Cargo.toml
@@ -37,5 +37,6 @@ default = [
 ]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
 
 ASIdentifierManager = ["objc2-foundation/NSUUID"]
diff --git a/framework-crates/objc2-ad-support/src/lib.rs b/framework-crates/objc2-ad-support/src/lib.rs
index 380e14901..4777fcd9d 100644
--- a/framework-crates/objc2-ad-support/src/lib.rs
+++ b/framework-crates/objc2-ad-support/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/adsupport/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-ad-support/0.3.1")]
diff --git a/framework-crates/objc2-app-clip/Cargo.toml b/framework-crates/objc2-app-clip/Cargo.toml
index 2363c32e8..9189d50d4 100644
--- a/framework-crates/objc2-app-clip/Cargo.toml
+++ b/framework-crates/objc2-app-clip/Cargo.toml
@@ -43,6 +43,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-core-location = ["dep:objc2-core-location"]
+unstable-darwin-objc = []
 
 APActivationPayload = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-app-clip/src/lib.rs b/framework-crates/objc2-app-clip/src/lib.rs
index bce5f837b..fb4ad32b0 100644
--- a/framework-crates/objc2-app-clip/src/lib.rs
+++ b/framework-crates/objc2-app-clip/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/appclip/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-app-clip/0.3.1")]
diff --git a/framework-crates/objc2-app-kit/Cargo.toml b/framework-crates/objc2-app-kit/Cargo.toml
index 2af95e48d..04bdb6c20 100644
--- a/framework-crates/objc2-app-kit/Cargo.toml
+++ b/framework-crates/objc2-app-kit/Cargo.toml
@@ -424,6 +424,7 @@ objc2-core-video = ["dep:objc2-core-video"]
 objc2-open-gl = ["dep:objc2-open-gl"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 AppKitDefines = []
 AppKitErrors = []
diff --git a/framework-crates/objc2-app-kit/src/lib.rs b/framework-crates/objc2-app-kit/src/lib.rs
index e6572bd8e..ac88852f1 100644
--- a/framework-crates/objc2-app-kit/src/lib.rs
+++ b/framework-crates/objc2-app-kit/src/lib.rs
@@ -19,6 +19,7 @@
 //! `window.releasedWhenClosed(false)` to get correct memory management, which
 //! is also why the creation methods for `NSWindow` are `unsafe`.
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-app-kit/0.3.1")]
diff --git a/framework-crates/objc2-app-tracking-transparency/Cargo.toml b/framework-crates/objc2-app-tracking-transparency/Cargo.toml
index 26f115fb1..9b533875a 100644
--- a/framework-crates/objc2-app-tracking-transparency/Cargo.toml
+++ b/framework-crates/objc2-app-tracking-transparency/Cargo.toml
@@ -39,3 +39,4 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-app-tracking-transparency/src/lib.rs b/framework-crates/objc2-app-tracking-transparency/src/lib.rs
index 89ae091c6..0d7992419 100644
--- a/framework-crates/objc2-app-tracking-transparency/src/lib.rs
+++ b/framework-crates/objc2-app-tracking-transparency/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/apptrackingtransparency/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-app-tracking-transparency/0.3.1")]
diff --git a/framework-crates/objc2-application-services/Cargo.toml b/framework-crates/objc2-application-services/Cargo.toml
index 3487b834d..3d7d63588 100644
--- a/framework-crates/objc2-application-services/Cargo.toml
+++ b/framework-crates/objc2-application-services/Cargo.toml
@@ -103,6 +103,7 @@ objc2 = [
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-services = ["dep:objc2-core-services"]
 objc2-foundation = ["dep:objc2-foundation"]
+unstable-darwin-objc = []
 
 AXActionConstants = []
 AXAttributeConstants = ["bitflags"]
diff --git a/framework-crates/objc2-application-services/src/lib.rs b/framework-crates/objc2-application-services/src/lib.rs
index bd9b1f195..87ee596ba 100644
--- a/framework-crates/objc2-application-services/src/lib.rs
+++ b/framework-crates/objc2-application-services/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/applicationservices/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-application-services/0.3.1")]
diff --git a/framework-crates/objc2-ar-kit/Cargo.toml b/framework-crates/objc2-ar-kit/Cargo.toml
index d5ad7b287..ec59c30a9 100644
--- a/framework-crates/objc2-ar-kit/Cargo.toml
+++ b/framework-crates/objc2-ar-kit/Cargo.toml
@@ -188,6 +188,7 @@ objc2-scene-kit = ["dep:objc2-scene-kit"]
 objc2-sprite-kit = ["dep:objc2-sprite-kit"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
 objc2-vision = ["dep:objc2-vision"]
+unstable-darwin-objc = []
 
 ARAnchor = []
 ARAppClipCodeAnchor = []
diff --git a/framework-crates/objc2-ar-kit/src/lib.rs b/framework-crates/objc2-ar-kit/src/lib.rs
index 4e3daa697..9a157060e 100644
--- a/framework-crates/objc2-ar-kit/src/lib.rs
+++ b/framework-crates/objc2-ar-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/arkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-ar-kit/0.3.1")]
diff --git a/framework-crates/objc2-audio-toolbox/Cargo.toml b/framework-crates/objc2-audio-toolbox/Cargo.toml
index 5006a4657..f8b61e261 100644
--- a/framework-crates/objc2-audio-toolbox/Cargo.toml
+++ b/framework-crates/objc2-audio-toolbox/Cargo.toml
@@ -111,6 +111,7 @@ objc2-core-audio = ["dep:objc2-core-audio"]
 objc2-core-audio-types = ["dep:objc2-core-audio-types"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-midi = ["dep:objc2-core-midi"]
+unstable-darwin-objc = []
 
 AUAudioUnit = [
     "bitflags",
diff --git a/framework-crates/objc2-audio-toolbox/src/lib.rs b/framework-crates/objc2-audio-toolbox/src/lib.rs
index fe01d056f..7e3e01b3b 100644
--- a/framework-crates/objc2-audio-toolbox/src/lib.rs
+++ b/framework-crates/objc2-audio-toolbox/src/lib.rs
@@ -8,6 +8,7 @@
 //! [audiounit]: https://developer.apple.com/documentation/audiounit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-audio-toolbox/0.3.1")]
diff --git a/framework-crates/objc2-authentication-services/Cargo.toml b/framework-crates/objc2-authentication-services/Cargo.toml
index b983400d2..340b01fb5 100644
--- a/framework-crates/objc2-authentication-services/Cargo.toml
+++ b/framework-crates/objc2-authentication-services/Cargo.toml
@@ -162,6 +162,7 @@ block2 = ["dep:block2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-local-authentication = ["dep:objc2-local-authentication"]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 ASAccountAuthenticationModificationController = [
     "objc2-app-kit/NSResponder",
diff --git a/framework-crates/objc2-authentication-services/src/lib.rs b/framework-crates/objc2-authentication-services/src/lib.rs
index f534b238e..bf29dfb89 100644
--- a/framework-crates/objc2-authentication-services/src/lib.rs
+++ b/framework-crates/objc2-authentication-services/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/authenticationservices/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-authentication-services/0.3.1")]
diff --git a/framework-crates/objc2-automatic-assessment-configuration/Cargo.toml b/framework-crates/objc2-automatic-assessment-configuration/Cargo.toml
index fbf136c91..df3dffba6 100644
--- a/framework-crates/objc2-automatic-assessment-configuration/Cargo.toml
+++ b/framework-crates/objc2-automatic-assessment-configuration/Cargo.toml
@@ -41,3 +41,4 @@ targets = [
 default = ["std"]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-automatic-assessment-configuration/src/lib.rs b/framework-crates/objc2-automatic-assessment-configuration/src/lib.rs
index 0d4bb4f36..205a67bc7 100644
--- a/framework-crates/objc2-automatic-assessment-configuration/src/lib.rs
+++ b/framework-crates/objc2-automatic-assessment-configuration/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/automaticassessmentconfiguration/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-automatic-assessment-configuration/0.3.1")]
diff --git a/framework-crates/objc2-automator/Cargo.toml b/framework-crates/objc2-automator/Cargo.toml
index cbe07085f..2bc5d827e 100644
--- a/framework-crates/objc2-automator/Cargo.toml
+++ b/framework-crates/objc2-automator/Cargo.toml
@@ -66,6 +66,7 @@ alloc = []
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-osa-kit = ["dep:objc2-osa-kit"]
+unstable-darwin-objc = []
 
 AMAction = [
     "objc2-foundation/NSDictionary",
diff --git a/framework-crates/objc2-automator/src/lib.rs b/framework-crates/objc2-automator/src/lib.rs
index 2afbc2746..32c5c6da5 100644
--- a/framework-crates/objc2-automator/src/lib.rs
+++ b/framework-crates/objc2-automator/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/automator/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-automator/0.3.1")]
diff --git a/framework-crates/objc2-av-foundation/Cargo.toml b/framework-crates/objc2-av-foundation/Cargo.toml
index c97ad6176..b5e6291a5 100644
--- a/framework-crates/objc2-av-foundation/Cargo.toml
+++ b/framework-crates/objc2-av-foundation/Cargo.toml
@@ -286,6 +286,7 @@ objc2-image-io = ["dep:objc2-image-io"]
 objc2-media-toolbox = ["dep:objc2-media-toolbox"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 AVAnimation = ["objc2-foundation/NSString"]
 AVAsset = [
diff --git a/framework-crates/objc2-av-foundation/src/lib.rs b/framework-crates/objc2-av-foundation/src/lib.rs
index 8c5e98611..6e4b842e8 100644
--- a/framework-crates/objc2-av-foundation/src/lib.rs
+++ b/framework-crates/objc2-av-foundation/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/avfoundation/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-av-foundation/0.3.1")]
diff --git a/framework-crates/objc2-av-kit/Cargo.toml b/framework-crates/objc2-av-kit/Cargo.toml
index 1ae53d32f..3361b77f9 100644
--- a/framework-crates/objc2-av-kit/Cargo.toml
+++ b/framework-crates/objc2-av-kit/Cargo.toml
@@ -100,6 +100,7 @@ objc2-av-foundation = ["dep:objc2-av-foundation"]
 objc2-av-routing = ["dep:objc2-av-routing"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-media = ["dep:objc2-core-media"]
+unstable-darwin-objc = []
 
 AVCaptureView = [
     "objc2-foundation/NSCoder",
diff --git a/framework-crates/objc2-av-kit/src/lib.rs b/framework-crates/objc2-av-kit/src/lib.rs
index 56501ec8c..197781776 100644
--- a/framework-crates/objc2-av-kit/src/lib.rs
+++ b/framework-crates/objc2-av-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/avkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-av-kit/0.3.1")]
diff --git a/framework-crates/objc2-av-routing/Cargo.toml b/framework-crates/objc2-av-routing/Cargo.toml
index 956a0a1fc..396c0bd99 100644
--- a/framework-crates/objc2-av-routing/Cargo.toml
+++ b/framework-crates/objc2-av-routing/Cargo.toml
@@ -48,6 +48,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 AVCustomDeviceRoute = ["objc2-foundation/NSUUID"]
 AVCustomRoutingActionItem = ["objc2-foundation/NSString"]
diff --git a/framework-crates/objc2-av-routing/src/lib.rs b/framework-crates/objc2-av-routing/src/lib.rs
index b3b5dec0f..ab6720025 100644
--- a/framework-crates/objc2-av-routing/src/lib.rs
+++ b/framework-crates/objc2-av-routing/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/avrouting/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-av-routing/0.3.1")]
diff --git a/framework-crates/objc2-avf-audio/Cargo.toml b/framework-crates/objc2-avf-audio/Cargo.toml
index 412926aa5..269c83682 100644
--- a/framework-crates/objc2-avf-audio/Cargo.toml
+++ b/framework-crates/objc2-avf-audio/Cargo.toml
@@ -120,6 +120,7 @@ objc2-audio-toolbox = ["dep:objc2-audio-toolbox"]
 objc2-core-audio-types = ["dep:objc2-core-audio-types"]
 objc2-core-media = ["dep:objc2-core-media"]
 objc2-core-midi = ["dep:objc2-core-midi"]
+unstable-darwin-objc = []
 
 AVAudioApplication = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-avf-audio/src/lib.rs b/framework-crates/objc2-avf-audio/src/lib.rs
index 15c10b5d2..0f094e7fb 100644
--- a/framework-crates/objc2-avf-audio/src/lib.rs
+++ b/framework-crates/objc2-avf-audio/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/avfaudio/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-avf-audio/0.3.1")]
diff --git a/framework-crates/objc2-background-assets/Cargo.toml b/framework-crates/objc2-background-assets/Cargo.toml
index 3db91d931..851dd574a 100644
--- a/framework-crates/objc2-background-assets/Cargo.toml
+++ b/framework-crates/objc2-background-assets/Cargo.toml
@@ -57,6 +57,7 @@ std = ["alloc"]
 alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 BAAppExtensionInfo = [
     "objc2-foundation/NSObject",
diff --git a/framework-crates/objc2-background-assets/src/lib.rs b/framework-crates/objc2-background-assets/src/lib.rs
index 3a247729e..0fe43f4db 100644
--- a/framework-crates/objc2-background-assets/src/lib.rs
+++ b/framework-crates/objc2-background-assets/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/backgroundassets/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-background-assets/0.3.1")]
diff --git a/framework-crates/objc2-background-tasks/Cargo.toml b/framework-crates/objc2-background-tasks/Cargo.toml
index 7bef37494..635b9118c 100644
--- a/framework-crates/objc2-background-tasks/Cargo.toml
+++ b/framework-crates/objc2-background-tasks/Cargo.toml
@@ -52,6 +52,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
+unstable-darwin-objc = []
 
 BGDefines = []
 BGTask = [
diff --git a/framework-crates/objc2-background-tasks/src/lib.rs b/framework-crates/objc2-background-tasks/src/lib.rs
index 89d5ed09d..ca8e8ea04 100644
--- a/framework-crates/objc2-background-tasks/src/lib.rs
+++ b/framework-crates/objc2-background-tasks/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/backgroundtasks/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-background-tasks/0.3.1")]
diff --git a/framework-crates/objc2-browser-engine-core/Cargo.toml b/framework-crates/objc2-browser-engine-core/Cargo.toml
index 465c38f5f..56db7be98 100644
--- a/framework-crates/objc2-browser-engine-core/Cargo.toml
+++ b/framework-crates/objc2-browser-engine-core/Cargo.toml
@@ -53,6 +53,7 @@ libc = ["dep:libc"]
 objc2 = ["dep:objc2"]
 objc2-avf-audio = ["dep:objc2-avf-audio"]
 objc2-foundation = ["dep:objc2-foundation"]
+unstable-darwin-objc = []
 
 BEAudioSession = []
 BEMemory = []
diff --git a/framework-crates/objc2-browser-engine-core/src/lib.rs b/framework-crates/objc2-browser-engine-core/src/lib.rs
index 723404f93..9ec5bd074 100644
--- a/framework-crates/objc2-browser-engine-core/src/lib.rs
+++ b/framework-crates/objc2-browser-engine-core/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/browserenginecore/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-browser-engine-core/0.3.1")]
diff --git a/framework-crates/objc2-browser-engine-kit/Cargo.toml b/framework-crates/objc2-browser-engine-kit/Cargo.toml
index 9b106c727..161057759 100644
--- a/framework-crates/objc2-browser-engine-kit/Cargo.toml
+++ b/framework-crates/objc2-browser-engine-kit/Cargo.toml
@@ -89,6 +89,7 @@ objc2-av-foundation = ["dep:objc2-av-foundation"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 BEAccessibility = [
     "bitflags",
diff --git a/framework-crates/objc2-browser-engine-kit/src/lib.rs b/framework-crates/objc2-browser-engine-kit/src/lib.rs
index 135aa4ae8..6f566c535 100644
--- a/framework-crates/objc2-browser-engine-kit/src/lib.rs
+++ b/framework-crates/objc2-browser-engine-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/browserenginekit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-browser-engine-kit/0.3.1")]
diff --git a/framework-crates/objc2-business-chat/Cargo.toml b/framework-crates/objc2-business-chat/Cargo.toml
index 8035325a4..4eedfb541 100644
--- a/framework-crates/objc2-business-chat/Cargo.toml
+++ b/framework-crates/objc2-business-chat/Cargo.toml
@@ -40,6 +40,7 @@ default = [
 ]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
 
 BCChatAction = [
     "objc2-foundation/NSDictionary",
diff --git a/framework-crates/objc2-business-chat/src/lib.rs b/framework-crates/objc2-business-chat/src/lib.rs
index 667c1a87c..f93ffbfaf 100644
--- a/framework-crates/objc2-business-chat/src/lib.rs
+++ b/framework-crates/objc2-business-chat/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/businesschat/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-business-chat/0.3.1")]
diff --git a/framework-crates/objc2-call-kit/Cargo.toml b/framework-crates/objc2-call-kit/Cargo.toml
index 1bc4abd41..bb96e2bee 100644
--- a/framework-crates/objc2-call-kit/Cargo.toml
+++ b/framework-crates/objc2-call-kit/Cargo.toml
@@ -72,6 +72,7 @@ alloc = []
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-avf-audio = ["dep:objc2-avf-audio"]
+unstable-darwin-objc = []
 
 CXAction = [
     "objc2-foundation/NSCoder",
diff --git a/framework-crates/objc2-call-kit/src/lib.rs b/framework-crates/objc2-call-kit/src/lib.rs
index 6d25e55e9..b0df5bd22 100644
--- a/framework-crates/objc2-call-kit/src/lib.rs
+++ b/framework-crates/objc2-call-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/callkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-call-kit/0.3.1")]
diff --git a/framework-crates/objc2-car-play/Cargo.toml b/framework-crates/objc2-car-play/Cargo.toml
index 4ff49a587..0ad5eaaf7 100644
--- a/framework-crates/objc2-car-play/Cargo.toml
+++ b/framework-crates/objc2-car-play/Cargo.toml
@@ -142,6 +142,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-map-kit = ["dep:objc2-map-kit"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 CPActionSheetTemplate = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-car-play/src/lib.rs b/framework-crates/objc2-car-play/src/lib.rs
index bb983d5d9..c4644f8c3 100644
--- a/framework-crates/objc2-car-play/src/lib.rs
+++ b/framework-crates/objc2-car-play/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/carplay/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-car-play/0.3.1")]
diff --git a/framework-crates/objc2-carbon/Cargo.toml b/framework-crates/objc2-carbon/Cargo.toml
index 2e6aeaa2b..c919c9498 100644
--- a/framework-crates/objc2-carbon/Cargo.toml
+++ b/framework-crates/objc2-carbon/Cargo.toml
@@ -29,3 +29,4 @@ targets = [
 default = ["std"]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-carbon/src/lib.rs b/framework-crates/objc2-carbon/src/lib.rs
index 2901c9a07..7ea0c15ab 100644
--- a/framework-crates/objc2-carbon/src/lib.rs
+++ b/framework-crates/objc2-carbon/src/lib.rs
@@ -5,6 +5,7 @@
 //!
 //! [new-issue]: https://github.com/madsmtm/objc2/issues/new
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 
 #[cfg(feature = "alloc")]
 extern crate alloc;
diff --git a/framework-crates/objc2-cf-network/Cargo.toml b/framework-crates/objc2-cf-network/Cargo.toml
index 6ea2e0d96..c34003934 100644
--- a/framework-crates/objc2-cf-network/Cargo.toml
+++ b/framework-crates/objc2-cf-network/Cargo.toml
@@ -56,6 +56,7 @@ objc2 = [
     "dep:objc2",
     "objc2-core-foundation/objc2",
 ]
+unstable-darwin-objc = []
 
 CFFTPStream = [
     "objc2-core-foundation/CFDictionary",
diff --git a/framework-crates/objc2-cf-network/src/lib.rs b/framework-crates/objc2-cf-network/src/lib.rs
index 9b991165e..31a642f3b 100644
--- a/framework-crates/objc2-cf-network/src/lib.rs
+++ b/framework-crates/objc2-cf-network/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/cfnetwork/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-cf-network/0.3.1")]
diff --git a/framework-crates/objc2-cinematic/Cargo.toml b/framework-crates/objc2-cinematic/Cargo.toml
index 3ed7e84a5..783f03391 100644
--- a/framework-crates/objc2-cinematic/Cargo.toml
+++ b/framework-crates/objc2-cinematic/Cargo.toml
@@ -89,6 +89,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-media = ["dep:objc2-core-media"]
 objc2-core-video = ["dep:objc2-core-video"]
 objc2-metal = ["dep:objc2-metal"]
+unstable-darwin-objc = []
 
 CNAssetInfo = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-cinematic/src/lib.rs b/framework-crates/objc2-cinematic/src/lib.rs
index a62383944..c930c24d4 100644
--- a/framework-crates/objc2-cinematic/src/lib.rs
+++ b/framework-crates/objc2-cinematic/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/cinematic/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-cinematic/0.3.1")]
diff --git a/framework-crates/objc2-class-kit/Cargo.toml b/framework-crates/objc2-class-kit/Cargo.toml
index 026e39aeb..b37e20cd7 100644
--- a/framework-crates/objc2-class-kit/Cargo.toml
+++ b/framework-crates/objc2-class-kit/Cargo.toml
@@ -57,6 +57,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 CLSActivity = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-class-kit/src/lib.rs b/framework-crates/objc2-class-kit/src/lib.rs
index 99a0bd4b3..1d2f185a1 100644
--- a/framework-crates/objc2-class-kit/src/lib.rs
+++ b/framework-crates/objc2-class-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/classkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-class-kit/0.3.1")]
diff --git a/framework-crates/objc2-clock-kit/Cargo.toml b/framework-crates/objc2-clock-kit/Cargo.toml
index 85d6dbcdd..b4d244ec5 100644
--- a/framework-crates/objc2-clock-kit/Cargo.toml
+++ b/framework-crates/objc2-clock-kit/Cargo.toml
@@ -66,6 +66,7 @@ bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-intents = ["dep:objc2-intents"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 CLKComplication = [
     "objc2-foundation/NSDictionary",
diff --git a/framework-crates/objc2-clock-kit/src/lib.rs b/framework-crates/objc2-clock-kit/src/lib.rs
index 11f62cd2e..014573cba 100644
--- a/framework-crates/objc2-clock-kit/src/lib.rs
+++ b/framework-crates/objc2-clock-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/clockkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-clock-kit/0.3.1")]
diff --git a/framework-crates/objc2-cloud-kit/Cargo.toml b/framework-crates/objc2-cloud-kit/Cargo.toml
index 53b436d90..3050a2cce 100644
--- a/framework-crates/objc2-cloud-kit/Cargo.toml
+++ b/framework-crates/objc2-cloud-kit/Cargo.toml
@@ -105,6 +105,7 @@ bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-contacts = ["dep:objc2-contacts"]
 objc2-core-location = ["dep:objc2-core-location"]
+unstable-darwin-objc = []
 
 CKAcceptSharesOperation = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-cloud-kit/src/lib.rs b/framework-crates/objc2-cloud-kit/src/lib.rs
index f68524bbe..a77c3e689 100644
--- a/framework-crates/objc2-cloud-kit/src/lib.rs
+++ b/framework-crates/objc2-cloud-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/cloudkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-cloud-kit/0.3.1")]
diff --git a/framework-crates/objc2-collaboration/Cargo.toml b/framework-crates/objc2-collaboration/Cargo.toml
index 7d33081e0..65b9b2f85 100644
--- a/framework-crates/objc2-collaboration/Cargo.toml
+++ b/framework-crates/objc2-collaboration/Cargo.toml
@@ -64,6 +64,7 @@ libc = ["dep:libc"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-services = ["dep:objc2-core-services"]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 CBIdentity = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-collaboration/src/lib.rs b/framework-crates/objc2-collaboration/src/lib.rs
index 00eed9cb6..39f6be302 100644
--- a/framework-crates/objc2-collaboration/src/lib.rs
+++ b/framework-crates/objc2-collaboration/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/collaboration/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-collaboration/0.3.1")]
diff --git a/framework-crates/objc2-color-sync/Cargo.toml b/framework-crates/objc2-color-sync/Cargo.toml
index 5f6e2b212..087bfdd88 100644
--- a/framework-crates/objc2-color-sync/Cargo.toml
+++ b/framework-crates/objc2-color-sync/Cargo.toml
@@ -48,6 +48,7 @@ objc2 = [
     "dep:objc2",
     "objc2-core-foundation/objc2",
 ]
+unstable-darwin-objc = []
 
 ColorSyncBase = []
 ColorSyncCMM = [
diff --git a/framework-crates/objc2-color-sync/src/lib.rs b/framework-crates/objc2-color-sync/src/lib.rs
index 36cd98a8f..ba3233744 100644
--- a/framework-crates/objc2-color-sync/src/lib.rs
+++ b/framework-crates/objc2-color-sync/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/colorsync/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-color-sync/0.3.1")]
diff --git a/framework-crates/objc2-compositor-services/Cargo.toml b/framework-crates/objc2-compositor-services/Cargo.toml
index 6a8b18c5f..62047d8f6 100644
--- a/framework-crates/objc2-compositor-services/Cargo.toml
+++ b/framework-crates/objc2-compositor-services/Cargo.toml
@@ -73,6 +73,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-metal = ["dep:objc2-metal"]
+unstable-darwin-objc = []
 
 cp_base = []
 cp_conditionals = []
diff --git a/framework-crates/objc2-compositor-services/src/lib.rs b/framework-crates/objc2-compositor-services/src/lib.rs
index 09ce54b0f..c8207cc21 100644
--- a/framework-crates/objc2-compositor-services/src/lib.rs
+++ b/framework-crates/objc2-compositor-services/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/compositorservices/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-compositor-services/0.3.1")]
diff --git a/framework-crates/objc2-contacts-ui/Cargo.toml b/framework-crates/objc2-contacts-ui/Cargo.toml
index 914e60cb0..2102dbec3 100644
--- a/framework-crates/objc2-contacts-ui/Cargo.toml
+++ b/framework-crates/objc2-contacts-ui/Cargo.toml
@@ -58,6 +58,7 @@ std = ["alloc"]
 alloc = []
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-contacts = ["dep:objc2-contacts"]
+unstable-darwin-objc = []
 
 CNContactPicker = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-contacts-ui/src/lib.rs b/framework-crates/objc2-contacts-ui/src/lib.rs
index 8c3ceffed..42c8db44d 100644
--- a/framework-crates/objc2-contacts-ui/src/lib.rs
+++ b/framework-crates/objc2-contacts-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/contactsui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-contacts-ui/0.3.1")]
diff --git a/framework-crates/objc2-contacts/Cargo.toml b/framework-crates/objc2-contacts/Cargo.toml
index d2efa848a..db4284be7 100644
--- a/framework-crates/objc2-contacts/Cargo.toml
+++ b/framework-crates/objc2-contacts/Cargo.toml
@@ -70,6 +70,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 CNChangeHistoryEvent = [
     "objc2-foundation/NSObject",
diff --git a/framework-crates/objc2-contacts/src/lib.rs b/framework-crates/objc2-contacts/src/lib.rs
index 5c92a6c0f..8ee157b8f 100644
--- a/framework-crates/objc2-contacts/src/lib.rs
+++ b/framework-crates/objc2-contacts/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/contacts/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-contacts/0.3.1")]
diff --git a/framework-crates/objc2-core-audio-kit/Cargo.toml b/framework-crates/objc2-core-audio-kit/Cargo.toml
index 5ac5f2254..00ee3b49f 100644
--- a/framework-crates/objc2-core-audio-kit/Cargo.toml
+++ b/framework-crates/objc2-core-audio-kit/Cargo.toml
@@ -83,6 +83,7 @@ block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-audio-toolbox = ["dep:objc2-audio-toolbox"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
+unstable-darwin-objc = []
 
 AUCustomViewPersistentData = [
     "objc2-foundation/NSDictionary",
diff --git a/framework-crates/objc2-core-audio-kit/src/lib.rs b/framework-crates/objc2-core-audio-kit/src/lib.rs
index d02b40f97..0da2ac71a 100644
--- a/framework-crates/objc2-core-audio-kit/src/lib.rs
+++ b/framework-crates/objc2-core-audio-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coreaudiokit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-audio-kit/0.3.1")]
diff --git a/framework-crates/objc2-core-audio-types/Cargo.toml b/framework-crates/objc2-core-audio-types/Cargo.toml
index 2bb02bda9..1faee385a 100644
--- a/framework-crates/objc2-core-audio-types/Cargo.toml
+++ b/framework-crates/objc2-core-audio-types/Cargo.toml
@@ -44,6 +44,7 @@ std = ["alloc"]
 alloc = []
 bitflags = ["dep:bitflags"]
 objc2 = ["dep:objc2"]
+unstable-darwin-objc = []
 
 AudioSessionTypes = []
 CoreAudioBaseTypes = ["bitflags"]
diff --git a/framework-crates/objc2-core-audio-types/src/lib.rs b/framework-crates/objc2-core-audio-types/src/lib.rs
index bfa848a8d..248d80b1e 100644
--- a/framework-crates/objc2-core-audio-types/src/lib.rs
+++ b/framework-crates/objc2-core-audio-types/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coreaudiotypes/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-audio-types/0.3.1")]
diff --git a/framework-crates/objc2-core-audio/Cargo.toml b/framework-crates/objc2-core-audio/Cargo.toml
index 3b92641ab..4e7bf9282 100644
--- a/framework-crates/objc2-core-audio/Cargo.toml
+++ b/framework-crates/objc2-core-audio/Cargo.toml
@@ -70,6 +70,7 @@ objc2 = [
 ]
 objc2-core-audio-types = ["dep:objc2-core-audio-types"]
 objc2-foundation = ["dep:objc2-foundation"]
+unstable-darwin-objc = []
 
 AudioHardware = ["objc2-core-foundation/CFDictionary"]
 AudioHardwareDeprecated = ["objc2-core-foundation/CFRunLoop"]
diff --git a/framework-crates/objc2-core-audio/src/lib.rs b/framework-crates/objc2-core-audio/src/lib.rs
index 1d8386457..2956616bd 100644
--- a/framework-crates/objc2-core-audio/src/lib.rs
+++ b/framework-crates/objc2-core-audio/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coreaudio/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-audio/0.3.1")]
diff --git a/framework-crates/objc2-core-bluetooth/Cargo.toml b/framework-crates/objc2-core-bluetooth/Cargo.toml
index 879adf28a..d545bb7a1 100644
--- a/framework-crates/objc2-core-bluetooth/Cargo.toml
+++ b/framework-crates/objc2-core-bluetooth/Cargo.toml
@@ -72,6 +72,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 dispatch2 = ["dep:dispatch2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
+unstable-darwin-objc = []
 
 CBATTRequest = ["objc2-foundation/NSData"]
 CBAdvertisementData = ["objc2-foundation/NSString"]
diff --git a/framework-crates/objc2-core-bluetooth/src/lib.rs b/framework-crates/objc2-core-bluetooth/src/lib.rs
index 9c084eb02..88de7321b 100644
--- a/framework-crates/objc2-core-bluetooth/src/lib.rs
+++ b/framework-crates/objc2-core-bluetooth/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corebluetooth/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-bluetooth/0.3.1")]
diff --git a/framework-crates/objc2-core-data/Cargo.toml b/framework-crates/objc2-core-data/Cargo.toml
index a7a433cca..5339dcdb3 100644
--- a/framework-crates/objc2-core-data/Cargo.toml
+++ b/framework-crates/objc2-core-data/Cargo.toml
@@ -139,6 +139,7 @@ bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-cloud-kit = ["dep:objc2-cloud-kit"]
 objc2-core-spotlight = ["dep:objc2-core-spotlight"]
+unstable-darwin-objc = []
 
 CloudKit = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-core-data/src/lib.rs b/framework-crates/objc2-core-data/src/lib.rs
index fa218e753..db7cb1a2f 100644
--- a/framework-crates/objc2-core-data/src/lib.rs
+++ b/framework-crates/objc2-core-data/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coredata/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-data/0.3.1")]
diff --git a/framework-crates/objc2-core-foundation/Cargo.toml b/framework-crates/objc2-core-foundation/Cargo.toml
index 16aa9b4fe..f235f792d 100644
--- a/framework-crates/objc2-core-foundation/Cargo.toml
+++ b/framework-crates/objc2-core-foundation/Cargo.toml
@@ -103,6 +103,7 @@ objc2 = [
     "dep:objc2",
     "dispatch2?/objc2",
 ]
+unstable-darwin-objc = []
 
 CFArray = []
 CFAttributedString = []
diff --git a/framework-crates/objc2-core-foundation/src/lib.rs b/framework-crates/objc2-core-foundation/src/lib.rs
index 25e1f8c5f..0e2e3c55f 100644
--- a/framework-crates/objc2-core-foundation/src/lib.rs
+++ b/framework-crates/objc2-core-foundation/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corefoundation/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(feature = "unstable-coerce-pointee", feature(derive_coerce_pointee))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
diff --git a/framework-crates/objc2-core-graphics/Cargo.toml b/framework-crates/objc2-core-graphics/Cargo.toml
index 4dc96af6c..7383b6d2e 100644
--- a/framework-crates/objc2-core-graphics/Cargo.toml
+++ b/framework-crates/objc2-core-graphics/Cargo.toml
@@ -114,6 +114,7 @@ objc2 = [
 ]
 objc2-io-surface = ["dep:objc2-io-surface"]
 objc2-metal = ["dep:objc2-metal"]
+unstable-darwin-objc = []
 
 CGAffineTransform = ["objc2-core-foundation/CFCGTypes"]
 CGBase = []
diff --git a/framework-crates/objc2-core-graphics/src/lib.rs b/framework-crates/objc2-core-graphics/src/lib.rs
index caf614893..9c6ab4dca 100644
--- a/framework-crates/objc2-core-graphics/src/lib.rs
+++ b/framework-crates/objc2-core-graphics/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coregraphics/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-graphics/0.3.1")]
diff --git a/framework-crates/objc2-core-haptics/Cargo.toml b/framework-crates/objc2-core-haptics/Cargo.toml
index 06a754314..6237d4ae5 100644
--- a/framework-crates/objc2-core-haptics/Cargo.toml
+++ b/framework-crates/objc2-core-haptics/Cargo.toml
@@ -49,6 +49,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-avf-audio = ["dep:objc2-avf-audio"]
+unstable-darwin-objc = []
 
 CHHapticDeviceCapability = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-core-haptics/src/lib.rs b/framework-crates/objc2-core-haptics/src/lib.rs
index e62997b71..af532d271 100644
--- a/framework-crates/objc2-core-haptics/src/lib.rs
+++ b/framework-crates/objc2-core-haptics/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corehaptics/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-haptics/0.3.1")]
diff --git a/framework-crates/objc2-core-image/Cargo.toml b/framework-crates/objc2-core-image/Cargo.toml
index 5eb7d9ef5..f49f6045d 100644
--- a/framework-crates/objc2-core-image/Cargo.toml
+++ b/framework-crates/objc2-core-image/Cargo.toml
@@ -128,6 +128,7 @@ objc2-image-io = ["dep:objc2-image-io"]
 objc2-io-surface = ["dep:objc2-io-surface"]
 objc2-metal = ["dep:objc2-metal"]
 objc2-open-gl = ["dep:objc2-open-gl"]
+unstable-darwin-objc = []
 
 CIBarcodeDescriptor = [
     "objc2-foundation/NSData",
diff --git a/framework-crates/objc2-core-image/src/lib.rs b/framework-crates/objc2-core-image/src/lib.rs
index 22153d932..743de5995 100644
--- a/framework-crates/objc2-core-image/src/lib.rs
+++ b/framework-crates/objc2-core-image/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coreimage/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-image/0.3.1")]
diff --git a/framework-crates/objc2-core-location-ui/Cargo.toml b/framework-crates/objc2-core-location-ui/Cargo.toml
index 90c15dc3b..1f5210fc7 100644
--- a/framework-crates/objc2-core-location-ui/Cargo.toml
+++ b/framework-crates/objc2-core-location-ui/Cargo.toml
@@ -60,6 +60,7 @@ alloc = []
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 CLLocationButton = [
     "objc2-foundation/NSCoder",
diff --git a/framework-crates/objc2-core-location-ui/src/lib.rs b/framework-crates/objc2-core-location-ui/src/lib.rs
index fd610b24b..ce3e4b151 100644
--- a/framework-crates/objc2-core-location-ui/src/lib.rs
+++ b/framework-crates/objc2-core-location-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corelocationui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-location-ui/0.3.1")]
diff --git a/framework-crates/objc2-core-location/Cargo.toml b/framework-crates/objc2-core-location/Cargo.toml
index 120d2ebe4..62ab78962 100644
--- a/framework-crates/objc2-core-location/Cargo.toml
+++ b/framework-crates/objc2-core-location/Cargo.toml
@@ -83,6 +83,7 @@ CLLocation = [
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-contacts = ["dep:objc2-contacts"]
+unstable-darwin-objc = []
 
 CLAvailability = []
 CLBackgroundActivitySession = []
diff --git a/framework-crates/objc2-core-location/src/lib.rs b/framework-crates/objc2-core-location/src/lib.rs
index a90d2d44e..a19c1f153 100644
--- a/framework-crates/objc2-core-location/src/lib.rs
+++ b/framework-crates/objc2-core-location/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corelocation/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-location/0.3.1")]
diff --git a/framework-crates/objc2-core-media-io/Cargo.toml b/framework-crates/objc2-core-media-io/Cargo.toml
index 2ecce9e81..615417840 100644
--- a/framework-crates/objc2-core-media-io/Cargo.toml
+++ b/framework-crates/objc2-core-media-io/Cargo.toml
@@ -83,6 +83,7 @@ libc = ["dep:libc"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-media = ["dep:objc2-core-media"]
 objc2-core-video = ["dep:objc2-core-video"]
+unstable-darwin-objc = []
 
 CMIOExtension = []
 CMIOExtensionDevice = [
diff --git a/framework-crates/objc2-core-media-io/src/lib.rs b/framework-crates/objc2-core-media-io/src/lib.rs
index 9f0493960..79a353d96 100644
--- a/framework-crates/objc2-core-media-io/src/lib.rs
+++ b/framework-crates/objc2-core-media-io/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coremediaio/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-media-io/0.3.1")]
diff --git a/framework-crates/objc2-core-media/Cargo.toml b/framework-crates/objc2-core-media/Cargo.toml
index c3631c2ea..0abef50aa 100644
--- a/framework-crates/objc2-core-media/Cargo.toml
+++ b/framework-crates/objc2-core-media/Cargo.toml
@@ -91,6 +91,7 @@ objc2 = [
 objc2-core-audio = ["dep:objc2-core-audio"]
 objc2-core-audio-types = ["dep:objc2-core-audio-types"]
 objc2-core-video = ["dep:objc2-core-video"]
+unstable-darwin-objc = []
 
 CMAttachment = ["objc2-core-foundation/CFDictionary"]
 CMAudioClock = []
diff --git a/framework-crates/objc2-core-media/src/lib.rs b/framework-crates/objc2-core-media/src/lib.rs
index b665de9c9..9e8fb06ea 100644
--- a/framework-crates/objc2-core-media/src/lib.rs
+++ b/framework-crates/objc2-core-media/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coremedia/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-media/0.3.1")]
diff --git a/framework-crates/objc2-core-midi/Cargo.toml b/framework-crates/objc2-core-midi/Cargo.toml
index afeb0f1ce..5348f4154 100644
--- a/framework-crates/objc2-core-midi/Cargo.toml
+++ b/framework-crates/objc2-core-midi/Cargo.toml
@@ -89,6 +89,7 @@ objc2 = [
 ]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-foundation = ["dep:objc2-foundation"]
+unstable-darwin-objc = []
 
 MIDIBluetoothConnection = []
 MIDICIDevice = []
diff --git a/framework-crates/objc2-core-midi/src/lib.rs b/framework-crates/objc2-core-midi/src/lib.rs
index bf3b0e639..557da74b9 100644
--- a/framework-crates/objc2-core-midi/src/lib.rs
+++ b/framework-crates/objc2-core-midi/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coremidi/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-midi/0.3.1")]
diff --git a/framework-crates/objc2-core-ml/Cargo.toml b/framework-crates/objc2-core-ml/Cargo.toml
index 81204dc7a..7537977b6 100644
--- a/framework-crates/objc2-core-ml/Cargo.toml
+++ b/framework-crates/objc2-core-ml/Cargo.toml
@@ -146,6 +146,7 @@ objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-video = ["dep:objc2-core-video"]
 objc2-image-io = ["dep:objc2-image-io"]
 objc2-metal = ["dep:objc2-metal"]
+unstable-darwin-objc = []
 
 MLAllComputeDevices = ["objc2-foundation/NSArray"]
 MLArrayBatchProvider = [
diff --git a/framework-crates/objc2-core-ml/src/lib.rs b/framework-crates/objc2-core-ml/src/lib.rs
index fb3b7e61d..0504110b3 100644
--- a/framework-crates/objc2-core-ml/src/lib.rs
+++ b/framework-crates/objc2-core-ml/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coreml/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-ml/0.3.1")]
diff --git a/framework-crates/objc2-core-motion/Cargo.toml b/framework-crates/objc2-core-motion/Cargo.toml
index 64c1bde4c..82bc57a83 100644
--- a/framework-crates/objc2-core-motion/Cargo.toml
+++ b/framework-crates/objc2-core-motion/Cargo.toml
@@ -80,6 +80,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-core-location = ["dep:objc2-core-location"]
+unstable-darwin-objc = []
 
 CMAbsoluteAltitude = ["objc2-foundation/NSObject"]
 CMAccelerometer = ["objc2-foundation/NSObject"]
diff --git a/framework-crates/objc2-core-motion/src/lib.rs b/framework-crates/objc2-core-motion/src/lib.rs
index ba04405db..a5a8ac137 100644
--- a/framework-crates/objc2-core-motion/src/lib.rs
+++ b/framework-crates/objc2-core-motion/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coremotion/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-motion/0.3.1")]
diff --git a/framework-crates/objc2-core-nfc/Cargo.toml b/framework-crates/objc2-core-nfc/Cargo.toml
index 34c52746a..a6cfde7ef 100644
--- a/framework-crates/objc2-core-nfc/Cargo.toml
+++ b/framework-crates/objc2-core-nfc/Cargo.toml
@@ -57,3 +57,4 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-core-nfc/src/lib.rs b/framework-crates/objc2-core-nfc/src/lib.rs
index 65821361b..beca1a34c 100644
--- a/framework-crates/objc2-core-nfc/src/lib.rs
+++ b/framework-crates/objc2-core-nfc/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corenfc/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-nfc/0.3.1")]
diff --git a/framework-crates/objc2-core-services/Cargo.toml b/framework-crates/objc2-core-services/Cargo.toml
index 3a09c9c97..f52f185b0 100644
--- a/framework-crates/objc2-core-services/Cargo.toml
+++ b/framework-crates/objc2-core-services/Cargo.toml
@@ -106,6 +106,7 @@ objc2 = [
     "objc2-security?/objc2",
 ]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 AE = []
 AEDataModel = []
diff --git a/framework-crates/objc2-core-services/src/lib.rs b/framework-crates/objc2-core-services/src/lib.rs
index 900b29349..9a5fc97bc 100644
--- a/framework-crates/objc2-core-services/src/lib.rs
+++ b/framework-crates/objc2-core-services/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coreservices/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-services/0.2.2")]
diff --git a/framework-crates/objc2-core-spotlight/Cargo.toml b/framework-crates/objc2-core-spotlight/Cargo.toml
index 16e86694a..f8b27d476 100644
--- a/framework-crates/objc2-core-spotlight/Cargo.toml
+++ b/framework-crates/objc2-core-spotlight/Cargo.toml
@@ -63,6 +63,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 CSBase = []
 CSImportExtension = [
diff --git a/framework-crates/objc2-core-spotlight/src/lib.rs b/framework-crates/objc2-core-spotlight/src/lib.rs
index 7ea8e5135..4a375ecd0 100644
--- a/framework-crates/objc2-core-spotlight/src/lib.rs
+++ b/framework-crates/objc2-core-spotlight/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corespotlight/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-spotlight/0.3.1")]
diff --git a/framework-crates/objc2-core-telephony/Cargo.toml b/framework-crates/objc2-core-telephony/Cargo.toml
index 0fd96a5c0..2d103ca32 100644
--- a/framework-crates/objc2-core-telephony/Cargo.toml
+++ b/framework-crates/objc2-core-telephony/Cargo.toml
@@ -50,6 +50,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 CTCall = ["objc2-foundation/NSString"]
 CTCallCenter = ["objc2-foundation/NSSet"]
diff --git a/framework-crates/objc2-core-telephony/src/lib.rs b/framework-crates/objc2-core-telephony/src/lib.rs
index 8b8820886..f9c2f583f 100644
--- a/framework-crates/objc2-core-telephony/src/lib.rs
+++ b/framework-crates/objc2-core-telephony/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coretelephony/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-telephony/0.3.1")]
diff --git a/framework-crates/objc2-core-text/Cargo.toml b/framework-crates/objc2-core-text/Cargo.toml
index b4a834875..47344d523 100644
--- a/framework-crates/objc2-core-text/Cargo.toml
+++ b/framework-crates/objc2-core-text/Cargo.toml
@@ -81,6 +81,7 @@ objc2 = [
     "objc2-core-graphics?/objc2",
 ]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 CTDefines = []
 CTFont = [
diff --git a/framework-crates/objc2-core-text/src/lib.rs b/framework-crates/objc2-core-text/src/lib.rs
index 3f6692f36..e4e3686c0 100644
--- a/framework-crates/objc2-core-text/src/lib.rs
+++ b/framework-crates/objc2-core-text/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/coretext/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-text/0.3.1")]
diff --git a/framework-crates/objc2-core-video/Cargo.toml b/framework-crates/objc2-core-video/Cargo.toml
index 3a2805aa8..5919480d0 100644
--- a/framework-crates/objc2-core-video/Cargo.toml
+++ b/framework-crates/objc2-core-video/Cargo.toml
@@ -97,6 +97,7 @@ objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-io-surface = ["dep:objc2-io-surface"]
 objc2-metal = ["dep:objc2-metal"]
 objc2-open-gl = ["dep:objc2-open-gl"]
+unstable-darwin-objc = []
 
 CVBase = ["bitflags"]
 CVBuffer = ["objc2-core-foundation/CFDictionary"]
diff --git a/framework-crates/objc2-core-video/src/lib.rs b/framework-crates/objc2-core-video/src/lib.rs
index ce6eec908..62658e20c 100644
--- a/framework-crates/objc2-core-video/src/lib.rs
+++ b/framework-crates/objc2-core-video/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corevideo/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-video/0.3.1")]
diff --git a/framework-crates/objc2-core-wlan/Cargo.toml b/framework-crates/objc2-core-wlan/Cargo.toml
index a8281c858..d2f40b214 100644
--- a/framework-crates/objc2-core-wlan/Cargo.toml
+++ b/framework-crates/objc2-core-wlan/Cargo.toml
@@ -62,6 +62,7 @@ bitflags = ["dep:bitflags"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-security = ["dep:objc2-security"]
 objc2-security-foundation = ["dep:objc2-security-foundation"]
+unstable-darwin-objc = []
 
 CWChannel = ["objc2-foundation/NSObject"]
 CWConfiguration = [
diff --git a/framework-crates/objc2-core-wlan/src/lib.rs b/framework-crates/objc2-core-wlan/src/lib.rs
index bdb960193..3a134aa19 100644
--- a/framework-crates/objc2-core-wlan/src/lib.rs
+++ b/framework-crates/objc2-core-wlan/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/corewlan/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-core-wlan/0.3.1")]
diff --git a/framework-crates/objc2-crypto-token-kit/Cargo.toml b/framework-crates/objc2-crypto-token-kit/Cargo.toml
index 5b499f410..f599323b5 100644
--- a/framework-crates/objc2-crypto-token-kit/Cargo.toml
+++ b/framework-crates/objc2-crypto-token-kit/Cargo.toml
@@ -63,6 +63,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 TKBase = []
 TKError = ["objc2-foundation/NSString"]
diff --git a/framework-crates/objc2-crypto-token-kit/src/lib.rs b/framework-crates/objc2-crypto-token-kit/src/lib.rs
index 848088283..abc7aa9f5 100644
--- a/framework-crates/objc2-crypto-token-kit/src/lib.rs
+++ b/framework-crates/objc2-crypto-token-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/cryptotokenkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-crypto-token-kit/0.3.1")]
diff --git a/framework-crates/objc2-data-detection/Cargo.toml b/framework-crates/objc2-data-detection/Cargo.toml
index c59f335ff..87e0cf824 100644
--- a/framework-crates/objc2-data-detection/Cargo.toml
+++ b/framework-crates/objc2-data-detection/Cargo.toml
@@ -40,6 +40,7 @@ default = [
 ]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
 
 DDMatch = [
     "objc2-foundation/NSDate",
diff --git a/framework-crates/objc2-data-detection/src/lib.rs b/framework-crates/objc2-data-detection/src/lib.rs
index b884b5485..37dc118ba 100644
--- a/framework-crates/objc2-data-detection/src/lib.rs
+++ b/framework-crates/objc2-data-detection/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/datadetection/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-data-detection/0.3.1")]
diff --git a/framework-crates/objc2-device-check/Cargo.toml b/framework-crates/objc2-device-check/Cargo.toml
index c598880c3..c0ee8d1ba 100644
--- a/framework-crates/objc2-device-check/Cargo.toml
+++ b/framework-crates/objc2-device-check/Cargo.toml
@@ -44,6 +44,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 DCAppAttestService = [
     "objc2-foundation/NSData",
diff --git a/framework-crates/objc2-device-check/src/lib.rs b/framework-crates/objc2-device-check/src/lib.rs
index c66340352..d34d801f4 100644
--- a/framework-crates/objc2-device-check/src/lib.rs
+++ b/framework-crates/objc2-device-check/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/devicecheck/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-device-check/0.3.1")]
diff --git a/framework-crates/objc2-device-discovery-extension/Cargo.toml b/framework-crates/objc2-device-discovery-extension/Cargo.toml
index 92dae2290..8a2796b6c 100644
--- a/framework-crates/objc2-device-discovery-extension/Cargo.toml
+++ b/framework-crates/objc2-device-discovery-extension/Cargo.toml
@@ -49,6 +49,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 DDCommon = []
 DDDevice = [
diff --git a/framework-crates/objc2-device-discovery-extension/src/lib.rs b/framework-crates/objc2-device-discovery-extension/src/lib.rs
index 6e8e6717d..5be53759d 100644
--- a/framework-crates/objc2-device-discovery-extension/src/lib.rs
+++ b/framework-crates/objc2-device-discovery-extension/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/devicediscoveryextension/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-device-discovery-extension/0.3.1")]
diff --git a/framework-crates/objc2-disk-arbitration/Cargo.toml b/framework-crates/objc2-disk-arbitration/Cargo.toml
index 16ffe0317..b36d822bb 100644
--- a/framework-crates/objc2-disk-arbitration/Cargo.toml
+++ b/framework-crates/objc2-disk-arbitration/Cargo.toml
@@ -53,6 +53,7 @@ objc2 = [
     "dispatch2?/objc2",
     "objc2-core-foundation/objc2",
 ]
+unstable-darwin-objc = []
 
 DADisk = [
     "objc2-core-foundation/CFDictionary",
diff --git a/framework-crates/objc2-disk-arbitration/src/lib.rs b/framework-crates/objc2-disk-arbitration/src/lib.rs
index 01274404d..c9ac22e5a 100644
--- a/framework-crates/objc2-disk-arbitration/src/lib.rs
+++ b/framework-crates/objc2-disk-arbitration/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/diskarbitration/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-disk-arbitration/0.3.1")]
diff --git a/framework-crates/objc2-event-kit-ui/Cargo.toml b/framework-crates/objc2-event-kit-ui/Cargo.toml
index 457c3f66b..febf28804 100644
--- a/framework-crates/objc2-event-kit-ui/Cargo.toml
+++ b/framework-crates/objc2-event-kit-ui/Cargo.toml
@@ -60,6 +60,7 @@ std = ["alloc"]
 alloc = []
 objc2-event-kit = ["dep:objc2-event-kit"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 EKCalendarChooser = [
     "objc2-foundation/NSBundle",
diff --git a/framework-crates/objc2-event-kit-ui/src/lib.rs b/framework-crates/objc2-event-kit-ui/src/lib.rs
index 0c215fe7d..3913d8112 100644
--- a/framework-crates/objc2-event-kit-ui/src/lib.rs
+++ b/framework-crates/objc2-event-kit-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/eventkitui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-event-kit-ui/0.3.1")]
diff --git a/framework-crates/objc2-event-kit/Cargo.toml b/framework-crates/objc2-event-kit/Cargo.toml
index f54f27c02..39394e06d 100644
--- a/framework-crates/objc2-event-kit/Cargo.toml
+++ b/framework-crates/objc2-event-kit/Cargo.toml
@@ -78,6 +78,7 @@ objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-location = ["dep:objc2-core-location"]
 objc2-map-kit = ["dep:objc2-map-kit"]
+unstable-darwin-objc = []
 
 EKAlarm = [
     "objc2-foundation/NSDate",
diff --git a/framework-crates/objc2-event-kit/src/lib.rs b/framework-crates/objc2-event-kit/src/lib.rs
index 4186c34a7..bcb3ad7dc 100644
--- a/framework-crates/objc2-event-kit/src/lib.rs
+++ b/framework-crates/objc2-event-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/eventkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-event-kit/0.3.1")]
diff --git a/framework-crates/objc2-exception-handling/Cargo.toml b/framework-crates/objc2-exception-handling/Cargo.toml
index 5346a8bc1..badf61836 100644
--- a/framework-crates/objc2-exception-handling/Cargo.toml
+++ b/framework-crates/objc2-exception-handling/Cargo.toml
@@ -36,6 +36,7 @@ default = [
 ]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
 
 ExceptionHandlingDefines = []
 NSExceptionHandler = [
diff --git a/framework-crates/objc2-exception-handling/src/lib.rs b/framework-crates/objc2-exception-handling/src/lib.rs
index 1d8d7f673..4a796797a 100644
--- a/framework-crates/objc2-exception-handling/src/lib.rs
+++ b/framework-crates/objc2-exception-handling/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/exceptionhandling/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-exception-handling/0.3.1")]
diff --git a/framework-crates/objc2-execution-policy/Cargo.toml b/framework-crates/objc2-execution-policy/Cargo.toml
index 40d462928..d9adb779c 100644
--- a/framework-crates/objc2-execution-policy/Cargo.toml
+++ b/framework-crates/objc2-execution-policy/Cargo.toml
@@ -43,6 +43,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 EPDeveloperTool = []
 EPErrors = [
diff --git a/framework-crates/objc2-execution-policy/src/lib.rs b/framework-crates/objc2-execution-policy/src/lib.rs
index 6fc646fb6..582dae462 100644
--- a/framework-crates/objc2-execution-policy/src/lib.rs
+++ b/framework-crates/objc2-execution-policy/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/executionpolicy/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-execution-policy/0.3.1")]
diff --git a/framework-crates/objc2-exposure-notification/Cargo.toml b/framework-crates/objc2-exposure-notification/Cargo.toml
index 6e25f2fb3..b6e8874ab 100644
--- a/framework-crates/objc2-exposure-notification/Cargo.toml
+++ b/framework-crates/objc2-exposure-notification/Cargo.toml
@@ -48,6 +48,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
+unstable-darwin-objc = []
 
 ENCommon = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-exposure-notification/src/lib.rs b/framework-crates/objc2-exposure-notification/src/lib.rs
index 975d74c47..8c4cf7e1c 100644
--- a/framework-crates/objc2-exposure-notification/src/lib.rs
+++ b/framework-crates/objc2-exposure-notification/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/exposurenotification/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-exposure-notification/0.3.1")]
diff --git a/framework-crates/objc2-extension-kit/Cargo.toml b/framework-crates/objc2-extension-kit/Cargo.toml
index cb44f9563..b4b3c32a9 100644
--- a/framework-crates/objc2-extension-kit/Cargo.toml
+++ b/framework-crates/objc2-extension-kit/Cargo.toml
@@ -53,6 +53,7 @@ default = [
 std = ["alloc"]
 alloc = []
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 EXAppExtensionBrowserViewController = [
     "objc2-foundation/NSBundle",
diff --git a/framework-crates/objc2-extension-kit/src/lib.rs b/framework-crates/objc2-extension-kit/src/lib.rs
index bd66d28c2..6d4d00d6d 100644
--- a/framework-crates/objc2-extension-kit/src/lib.rs
+++ b/framework-crates/objc2-extension-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/extensionkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-extension-kit/0.3.1")]
diff --git a/framework-crates/objc2-external-accessory/Cargo.toml b/framework-crates/objc2-external-accessory/Cargo.toml
index 2123fc01a..e636a7709 100644
--- a/framework-crates/objc2-external-accessory/Cargo.toml
+++ b/framework-crates/objc2-external-accessory/Cargo.toml
@@ -55,6 +55,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
+unstable-darwin-objc = []
 
 EAAccessory = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-external-accessory/src/lib.rs b/framework-crates/objc2-external-accessory/src/lib.rs
index 6d768fbf5..9950040da 100644
--- a/framework-crates/objc2-external-accessory/src/lib.rs
+++ b/framework-crates/objc2-external-accessory/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/externalaccessory/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-external-accessory/0.3.1")]
diff --git a/framework-crates/objc2-file-provider-ui/Cargo.toml b/framework-crates/objc2-file-provider-ui/Cargo.toml
index fa2724d89..ea13278dc 100644
--- a/framework-crates/objc2-file-provider-ui/Cargo.toml
+++ b/framework-crates/objc2-file-provider-ui/Cargo.toml
@@ -55,6 +55,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 FPUIActionExtensionContext = [
     "objc2-file-provider/NSFileProviderDomain",
diff --git a/framework-crates/objc2-file-provider-ui/src/lib.rs b/framework-crates/objc2-file-provider-ui/src/lib.rs
index f459d2439..2e2063f76 100644
--- a/framework-crates/objc2-file-provider-ui/src/lib.rs
+++ b/framework-crates/objc2-file-provider-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/fileproviderui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-file-provider-ui/0.3.1")]
diff --git a/framework-crates/objc2-file-provider/Cargo.toml b/framework-crates/objc2-file-provider/Cargo.toml
index f07ea4d77..f58186fd7 100644
--- a/framework-crates/objc2-file-provider/Cargo.toml
+++ b/framework-crates/objc2-file-provider/Cargo.toml
@@ -66,6 +66,7 @@ bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 Extension = [
     "bitflags",
diff --git a/framework-crates/objc2-file-provider/src/lib.rs b/framework-crates/objc2-file-provider/src/lib.rs
index 4ece32154..6e6ae0683 100644
--- a/framework-crates/objc2-file-provider/src/lib.rs
+++ b/framework-crates/objc2-file-provider/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/fileprovider/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-file-provider/0.3.1")]
diff --git a/framework-crates/objc2-finder-sync/Cargo.toml b/framework-crates/objc2-finder-sync/Cargo.toml
index b37d3efca..d6aee53aa 100644
--- a/framework-crates/objc2-finder-sync/Cargo.toml
+++ b/framework-crates/objc2-finder-sync/Cargo.toml
@@ -56,3 +56,4 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-finder-sync/src/lib.rs b/framework-crates/objc2-finder-sync/src/lib.rs
index b958ac2cc..9ec9cc2af 100644
--- a/framework-crates/objc2-finder-sync/src/lib.rs
+++ b/framework-crates/objc2-finder-sync/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/findersync/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-finder-sync/0.3.1")]
diff --git a/framework-crates/objc2-foundation/Cargo.toml b/framework-crates/objc2-foundation/Cargo.toml
index 26679c4f8..da0eca22f 100644
--- a/framework-crates/objc2-foundation/Cargo.toml
+++ b/framework-crates/objc2-foundation/Cargo.toml
@@ -257,6 +257,7 @@ block2 = ["dep:block2"]
 libc = ["dep:libc"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-services = ["dep:objc2-core-services"]
+unstable-darwin-objc = []
 
 FoundationErrors = []
 FoundationLegacySwiftCompatibility = []
diff --git a/framework-crates/objc2-foundation/src/lib.rs b/framework-crates/objc2-foundation/src/lib.rs
index 0056a9de1..13e7755bb 100644
--- a/framework-crates/objc2-foundation/src/lib.rs
+++ b/framework-crates/objc2-foundation/src/lib.rs
@@ -104,6 +104,7 @@
 //! println!("{}", dict.len());
 //! ```
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-foundation/0.3.1")]
diff --git a/framework-crates/objc2-fs-kit/Cargo.toml b/framework-crates/objc2-fs-kit/Cargo.toml
index 837c8b67a..5b5754c6c 100644
--- a/framework-crates/objc2-fs-kit/Cargo.toml
+++ b/framework-crates/objc2-fs-kit/Cargo.toml
@@ -61,6 +61,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 libc = ["dep:libc"]
+unstable-darwin-objc = []
 
 FSClient = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-fs-kit/src/lib.rs b/framework-crates/objc2-fs-kit/src/lib.rs
index eef6da8b1..8fb200fe9 100644
--- a/framework-crates/objc2-fs-kit/src/lib.rs
+++ b/framework-crates/objc2-fs-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/fskit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-fs-kit/0.3.1")]
diff --git a/framework-crates/objc2-game-controller/Cargo.toml b/framework-crates/objc2-game-controller/Cargo.toml
index a9c13bc43..68b74e132 100644
--- a/framework-crates/objc2-game-controller/Cargo.toml
+++ b/framework-crates/objc2-game-controller/Cargo.toml
@@ -129,6 +129,7 @@ dispatch2 = ["dep:dispatch2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-haptics = ["dep:objc2-core-haptics"]
+unstable-darwin-objc = []
 
 GCAxis2DInput = [
     "objc2-foundation/NSDate",
diff --git a/framework-crates/objc2-game-controller/src/lib.rs b/framework-crates/objc2-game-controller/src/lib.rs
index 75d79fb55..8558eb02f 100644
--- a/framework-crates/objc2-game-controller/src/lib.rs
+++ b/framework-crates/objc2-game-controller/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/gamecontroller/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-game-controller/0.3.1")]
diff --git a/framework-crates/objc2-game-kit/Cargo.toml b/framework-crates/objc2-game-kit/Cargo.toml
index 31d1d30de..7cbc4918c 100644
--- a/framework-crates/objc2-game-kit/Cargo.toml
+++ b/framework-crates/objc2-game-kit/Cargo.toml
@@ -107,6 +107,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 GKAccessPoint = [
     "objc2-foundation/NSGeometry",
diff --git a/framework-crates/objc2-game-kit/src/lib.rs b/framework-crates/objc2-game-kit/src/lib.rs
index 550498950..ce1157436 100644
--- a/framework-crates/objc2-game-kit/src/lib.rs
+++ b/framework-crates/objc2-game-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/gamekit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-game-kit/0.3.1")]
diff --git a/framework-crates/objc2-gameplay-kit/Cargo.toml b/framework-crates/objc2-gameplay-kit/Cargo.toml
index c7133701e..90ee01b7d 100644
--- a/framework-crates/objc2-gameplay-kit/Cargo.toml
+++ b/framework-crates/objc2-gameplay-kit/Cargo.toml
@@ -124,6 +124,7 @@ objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-scene-kit = ["dep:objc2-scene-kit"]
 objc2-sprite-kit = ["dep:objc2-sprite-kit"]
+unstable-darwin-objc = []
 
 GKAgent = [
     "objc2-foundation/NSDate",
diff --git a/framework-crates/objc2-gameplay-kit/src/lib.rs b/framework-crates/objc2-gameplay-kit/src/lib.rs
index e08e50f9b..e110fd831 100644
--- a/framework-crates/objc2-gameplay-kit/src/lib.rs
+++ b/framework-crates/objc2-gameplay-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/gameplaykit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-gameplay-kit/0.3.1")]
diff --git a/framework-crates/objc2-gl-kit/Cargo.toml b/framework-crates/objc2-gl-kit/Cargo.toml
index 3e1253553..e71d3d432 100644
--- a/framework-crates/objc2-gl-kit/Cargo.toml
+++ b/framework-crates/objc2-gl-kit/Cargo.toml
@@ -97,6 +97,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-model-io = ["dep:objc2-model-io"]
 objc2-open-gl = ["dep:objc2-open-gl"]
+unstable-darwin-objc = []
 
 GLKBaseEffect = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-gl-kit/src/lib.rs b/framework-crates/objc2-gl-kit/src/lib.rs
index 6df7bb1c2..4736380f0 100644
--- a/framework-crates/objc2-gl-kit/src/lib.rs
+++ b/framework-crates/objc2-gl-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/glkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-gl-kit/0.3.1")]
diff --git a/framework-crates/objc2-health-kit-ui/Cargo.toml b/framework-crates/objc2-health-kit-ui/Cargo.toml
index 899dda007..97369193f 100644
--- a/framework-crates/objc2-health-kit-ui/Cargo.toml
+++ b/framework-crates/objc2-health-kit-ui/Cargo.toml
@@ -56,6 +56,7 @@ alloc = []
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-health-kit = ["dep:objc2-health-kit"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
+unstable-darwin-objc = []
 
 HKActivityRingView = [
     "objc2-foundation/NSCoder",
diff --git a/framework-crates/objc2-health-kit-ui/src/lib.rs b/framework-crates/objc2-health-kit-ui/src/lib.rs
index 6848a3fb1..4c883bdee 100644
--- a/framework-crates/objc2-health-kit-ui/src/lib.rs
+++ b/framework-crates/objc2-health-kit-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/healthkitui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-health-kit-ui/0.3.1")]
diff --git a/framework-crates/objc2-health-kit/Cargo.toml b/framework-crates/objc2-health-kit/Cargo.toml
index 99e2b7cf4..61be6c252 100644
--- a/framework-crates/objc2-health-kit/Cargo.toml
+++ b/framework-crates/objc2-health-kit/Cargo.toml
@@ -142,6 +142,7 @@ bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-core-location = ["dep:objc2-core-location"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 HKActivitySummary = [
     "objc2-foundation/NSCalendar",
diff --git a/framework-crates/objc2-health-kit/src/lib.rs b/framework-crates/objc2-health-kit/src/lib.rs
index 132e75130..96afd5735 100644
--- a/framework-crates/objc2-health-kit/src/lib.rs
+++ b/framework-crates/objc2-health-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/healthkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-health-kit/0.3.1")]
diff --git a/framework-crates/objc2-home-kit/Cargo.toml b/framework-crates/objc2-home-kit/Cargo.toml
index 61033f7dc..a6df61b92 100644
--- a/framework-crates/objc2-home-kit/Cargo.toml
+++ b/framework-crates/objc2-home-kit/Cargo.toml
@@ -125,6 +125,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-location = ["dep:objc2-core-location"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 HMAccessControl = []
 HMAccessory = [
diff --git a/framework-crates/objc2-home-kit/src/lib.rs b/framework-crates/objc2-home-kit/src/lib.rs
index b04b23d93..bfae8afd1 100644
--- a/framework-crates/objc2-home-kit/src/lib.rs
+++ b/framework-crates/objc2-home-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/homekit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-home-kit/0.3.1")]
diff --git a/framework-crates/objc2-identity-lookup-ui/Cargo.toml b/framework-crates/objc2-identity-lookup-ui/Cargo.toml
index 3c9fe1b35..55c7cbbef 100644
--- a/framework-crates/objc2-identity-lookup-ui/Cargo.toml
+++ b/framework-crates/objc2-identity-lookup-ui/Cargo.toml
@@ -52,6 +52,7 @@ std = ["alloc"]
 alloc = []
 objc2-identity-lookup = ["dep:objc2-identity-lookup"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 ILClassificationUIExtensionContext = ["objc2-foundation/NSExtensionContext"]
 ILClassificationUIExtensionViewController = [
diff --git a/framework-crates/objc2-identity-lookup-ui/src/lib.rs b/framework-crates/objc2-identity-lookup-ui/src/lib.rs
index 878d9e5e3..541edae03 100644
--- a/framework-crates/objc2-identity-lookup-ui/src/lib.rs
+++ b/framework-crates/objc2-identity-lookup-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/identitylookupui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-identity-lookup-ui/0.3.1")]
diff --git a/framework-crates/objc2-identity-lookup/Cargo.toml b/framework-crates/objc2-identity-lookup/Cargo.toml
index d84a126ca..9987eb077 100644
--- a/framework-crates/objc2-identity-lookup/Cargo.toml
+++ b/framework-crates/objc2-identity-lookup/Cargo.toml
@@ -59,6 +59,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 ILBase = []
 ILCallClassificationRequest = [
diff --git a/framework-crates/objc2-identity-lookup/src/lib.rs b/framework-crates/objc2-identity-lookup/src/lib.rs
index 1ab4f1cde..32b210074 100644
--- a/framework-crates/objc2-identity-lookup/src/lib.rs
+++ b/framework-crates/objc2-identity-lookup/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/identitylookup/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-identity-lookup/0.3.1")]
diff --git a/framework-crates/objc2-image-capture-core/Cargo.toml b/framework-crates/objc2-image-capture-core/Cargo.toml
index bda2f46b8..fffce9d50 100644
--- a/framework-crates/objc2-image-capture-core/Cargo.toml
+++ b/framework-crates/objc2-image-capture-core/Cargo.toml
@@ -65,6 +65,7 @@ block2 = ["dep:block2"]
 libc = ["dep:libc"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 ICCameraDevice = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-image-capture-core/src/lib.rs b/framework-crates/objc2-image-capture-core/src/lib.rs
index 24c39986e..5f17a7b0b 100644
--- a/framework-crates/objc2-image-capture-core/src/lib.rs
+++ b/framework-crates/objc2-image-capture-core/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/imagecapturecore/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-image-capture-core/0.3.1")]
diff --git a/framework-crates/objc2-image-io/Cargo.toml b/framework-crates/objc2-image-io/Cargo.toml
index 59463d804..2bfdd420c 100644
--- a/framework-crates/objc2-image-io/Cargo.toml
+++ b/framework-crates/objc2-image-io/Cargo.toml
@@ -60,6 +60,7 @@ objc2 = [
     "objc2-core-graphics?/objc2",
 ]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 CGImageAnimation = [
     "objc2-core-foundation/CFData",
diff --git a/framework-crates/objc2-image-io/src/lib.rs b/framework-crates/objc2-image-io/src/lib.rs
index 3490a7f02..368dce778 100644
--- a/framework-crates/objc2-image-io/src/lib.rs
+++ b/framework-crates/objc2-image-io/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/imageio/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-image-io/0.3.1")]
diff --git a/framework-crates/objc2-input-method-kit/Cargo.toml b/framework-crates/objc2-input-method-kit/Cargo.toml
index 659c96081..3d0f2f3f4 100644
--- a/framework-crates/objc2-input-method-kit/Cargo.toml
+++ b/framework-crates/objc2-input-method-kit/Cargo.toml
@@ -43,6 +43,7 @@ default = [
 std = ["alloc"]
 alloc = []
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 IMKCandidates = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-input-method-kit/src/lib.rs b/framework-crates/objc2-input-method-kit/src/lib.rs
index 4df55f828..622e251c6 100644
--- a/framework-crates/objc2-input-method-kit/src/lib.rs
+++ b/framework-crates/objc2-input-method-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/inputmethodkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-input-method-kit/0.3.1")]
diff --git a/framework-crates/objc2-intents-ui/Cargo.toml b/framework-crates/objc2-intents-ui/Cargo.toml
index 6820a845a..c9bc5b3ea 100644
--- a/framework-crates/objc2-intents-ui/Cargo.toml
+++ b/framework-crates/objc2-intents-ui/Cargo.toml
@@ -75,6 +75,7 @@ alloc = []
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-intents = ["dep:objc2-intents"]
+unstable-darwin-objc = []
 
 INImage_IntentsUI = []
 INUIAddVoiceShortcutButton = [
diff --git a/framework-crates/objc2-intents-ui/src/lib.rs b/framework-crates/objc2-intents-ui/src/lib.rs
index 4c18d028c..3ee868941 100644
--- a/framework-crates/objc2-intents-ui/src/lib.rs
+++ b/framework-crates/objc2-intents-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/intentsui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-intents-ui/0.3.1")]
diff --git a/framework-crates/objc2-intents/Cargo.toml b/framework-crates/objc2-intents/Cargo.toml
index 58eca570d..f8bbdfc49 100644
--- a/framework-crates/objc2-intents/Cargo.toml
+++ b/framework-crates/objc2-intents/Cargo.toml
@@ -466,6 +466,7 @@ block2 = ["dep:block2"]
 objc2-contacts = ["dep:objc2-contacts"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-location = ["dep:objc2-core-location"]
+unstable-darwin-objc = []
 
 CLPlacemark_IntentsAdditions = ["objc2-foundation/NSString"]
 INAccountType = []
diff --git a/framework-crates/objc2-intents/src/lib.rs b/framework-crates/objc2-intents/src/lib.rs
index 55302aa17..2ed068e6d 100644
--- a/framework-crates/objc2-intents/src/lib.rs
+++ b/framework-crates/objc2-intents/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/intents/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-intents/0.3.1")]
diff --git a/framework-crates/objc2-io-bluetooth-ui/Cargo.toml b/framework-crates/objc2-io-bluetooth-ui/Cargo.toml
index 769eab3a8..b79fbe1d5 100644
--- a/framework-crates/objc2-io-bluetooth-ui/Cargo.toml
+++ b/framework-crates/objc2-io-bluetooth-ui/Cargo.toml
@@ -57,6 +57,7 @@ alloc = []
 objc2 = []
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-io-bluetooth = ["dep:objc2-io-bluetooth"]
+unstable-darwin-objc = []
 
 IOBluetoothDeviceSelectorController = [
     "objc2-app-kit/NSNib",
diff --git a/framework-crates/objc2-io-bluetooth-ui/src/lib.rs b/framework-crates/objc2-io-bluetooth-ui/src/lib.rs
index f9e3621b6..d3a654ff3 100644
--- a/framework-crates/objc2-io-bluetooth-ui/src/lib.rs
+++ b/framework-crates/objc2-io-bluetooth-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/iobluetoothui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-io-bluetooth-ui/0.3.1")]
diff --git a/framework-crates/objc2-io-bluetooth/Cargo.toml b/framework-crates/objc2-io-bluetooth/Cargo.toml
index abfd6d073..be05bb5c5 100644
--- a/framework-crates/objc2-io-bluetooth/Cargo.toml
+++ b/framework-crates/objc2-io-bluetooth/Cargo.toml
@@ -86,6 +86,7 @@ objc2 = [
 ]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-foundation = ["dep:objc2-foundation"]
+unstable-darwin-objc = []
 
 Bluetooth = []
 BluetoothAssignedNumbers = []
diff --git a/framework-crates/objc2-io-bluetooth/src/lib.rs b/framework-crates/objc2-io-bluetooth/src/lib.rs
index e178a8c89..491384533 100644
--- a/framework-crates/objc2-io-bluetooth/src/lib.rs
+++ b/framework-crates/objc2-io-bluetooth/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/iobluetooth/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-io-bluetooth/0.3.1")]
diff --git a/framework-crates/objc2-io-kit/Cargo.toml b/framework-crates/objc2-io-kit/Cargo.toml
index 281f874b0..774b79455 100644
--- a/framework-crates/objc2-io-kit/Cargo.toml
+++ b/framework-crates/objc2-io-kit/Cargo.toml
@@ -78,6 +78,7 @@ objc2 = [
     "dispatch2?/objc2",
     "objc2-core-foundation/objc2",
 ]
+unstable-darwin-objc = []
 
 AppleUSBDefinitions = []
 IOUSBHostFamilyDefinitions = []
diff --git a/framework-crates/objc2-io-kit/src/lib.rs b/framework-crates/objc2-io-kit/src/lib.rs
index a68f27222..294d6d11b 100644
--- a/framework-crates/objc2-io-kit/src/lib.rs
+++ b/framework-crates/objc2-io-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/iokit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-io-kit/0.3.1")]
diff --git a/framework-crates/objc2-io-surface/Cargo.toml b/framework-crates/objc2-io-surface/Cargo.toml
index b3791cbba..e221babac 100644
--- a/framework-crates/objc2-io-surface/Cargo.toml
+++ b/framework-crates/objc2-io-surface/Cargo.toml
@@ -64,6 +64,7 @@ objc2 = [
 ]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-foundation = ["dep:objc2-foundation"]
+unstable-darwin-objc = []
 
 IOSurface = []
 IOSurfaceAPI = []
diff --git a/framework-crates/objc2-io-surface/src/lib.rs b/framework-crates/objc2-io-surface/src/lib.rs
index ee435da80..220e3658c 100644
--- a/framework-crates/objc2-io-surface/src/lib.rs
+++ b/framework-crates/objc2-io-surface/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/iosurface/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-io-surface/0.3.1")]
diff --git a/framework-crates/objc2-io-usb-host/Cargo.toml b/framework-crates/objc2-io-usb-host/Cargo.toml
index c5d36c93f..337345812 100644
--- a/framework-crates/objc2-io-usb-host/Cargo.toml
+++ b/framework-crates/objc2-io-usb-host/Cargo.toml
@@ -76,6 +76,7 @@ block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-io-kit = ["dep:objc2-io-kit"]
+unstable-darwin-objc = []
 
 AppleUSBDescriptorParsing = []
 IOUSBHostCIControllerStateMachine = ["objc2-foundation/NSError"]
diff --git a/framework-crates/objc2-io-usb-host/src/lib.rs b/framework-crates/objc2-io-usb-host/src/lib.rs
index 789f7951c..c2c7c46ed 100644
--- a/framework-crates/objc2-io-usb-host/src/lib.rs
+++ b/framework-crates/objc2-io-usb-host/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/iousbhost/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-io-usb-host/0.3.1")]
diff --git a/framework-crates/objc2-itunes-library/Cargo.toml b/framework-crates/objc2-itunes-library/Cargo.toml
index 8fb829e8a..82e109b73 100644
--- a/framework-crates/objc2-itunes-library/Cargo.toml
+++ b/framework-crates/objc2-itunes-library/Cargo.toml
@@ -49,6 +49,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 ITLibAlbum = [
     "objc2-foundation/NSString",
diff --git a/framework-crates/objc2-itunes-library/src/lib.rs b/framework-crates/objc2-itunes-library/src/lib.rs
index 4faee5cc7..3ebaaa354 100644
--- a/framework-crates/objc2-itunes-library/src/lib.rs
+++ b/framework-crates/objc2-itunes-library/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/ituneslibrary/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-itunes-library/0.3.1")]
diff --git a/framework-crates/objc2-javascript-core/Cargo.toml b/framework-crates/objc2-javascript-core/Cargo.toml
index 0b8521b3e..8a47ce94d 100644
--- a/framework-crates/objc2-javascript-core/Cargo.toml
+++ b/framework-crates/objc2-javascript-core/Cargo.toml
@@ -74,6 +74,7 @@ objc2 = [
 ]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-foundation = ["dep:objc2-foundation"]
+unstable-darwin-objc = []
 
 JSBase = []
 JSContext = []
diff --git a/framework-crates/objc2-javascript-core/src/lib.rs b/framework-crates/objc2-javascript-core/src/lib.rs
index 8999da413..9ce46da30 100644
--- a/framework-crates/objc2-javascript-core/src/lib.rs
+++ b/framework-crates/objc2-javascript-core/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/javascriptcore/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-java-script-core/0.3.1")]
diff --git a/framework-crates/objc2-latent-semantic-mapping/Cargo.toml b/framework-crates/objc2-latent-semantic-mapping/Cargo.toml
index 6745eefbf..87760bd40 100644
--- a/framework-crates/objc2-latent-semantic-mapping/Cargo.toml
+++ b/framework-crates/objc2-latent-semantic-mapping/Cargo.toml
@@ -46,3 +46,4 @@ objc2 = [
     "dep:objc2",
     "objc2-core-foundation/objc2",
 ]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-latent-semantic-mapping/src/lib.rs b/framework-crates/objc2-latent-semantic-mapping/src/lib.rs
index a9548d946..837dc476b 100644
--- a/framework-crates/objc2-latent-semantic-mapping/src/lib.rs
+++ b/framework-crates/objc2-latent-semantic-mapping/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/latentsemanticmapping/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-latent-semantic-mapping/0.3.1")]
diff --git a/framework-crates/objc2-link-presentation/Cargo.toml b/framework-crates/objc2-link-presentation/Cargo.toml
index 55003d9a8..6fb164463 100644
--- a/framework-crates/objc2-link-presentation/Cargo.toml
+++ b/framework-crates/objc2-link-presentation/Cargo.toml
@@ -58,6 +58,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 LPError = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-link-presentation/src/lib.rs b/framework-crates/objc2-link-presentation/src/lib.rs
index 2f92e578f..85aa7ce26 100644
--- a/framework-crates/objc2-link-presentation/src/lib.rs
+++ b/framework-crates/objc2-link-presentation/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/linkpresentation/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-link-presentation/0.3.1")]
diff --git a/framework-crates/objc2-local-authentication-embedded-ui/Cargo.toml b/framework-crates/objc2-local-authentication-embedded-ui/Cargo.toml
index b0192ab6e..e0a6aeba0 100644
--- a/framework-crates/objc2-local-authentication-embedded-ui/Cargo.toml
+++ b/framework-crates/objc2-local-authentication-embedded-ui/Cargo.toml
@@ -58,6 +58,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 LAAuthenticationView = [
     "objc2-foundation/NSCoder",
diff --git a/framework-crates/objc2-local-authentication-embedded-ui/src/lib.rs b/framework-crates/objc2-local-authentication-embedded-ui/src/lib.rs
index 6b925fdcc..00dba1c98 100644
--- a/framework-crates/objc2-local-authentication-embedded-ui/src/lib.rs
+++ b/framework-crates/objc2-local-authentication-embedded-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/localauthenticationembeddedui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-local-authentication-embedded-ui/0.3.1")]
diff --git a/framework-crates/objc2-local-authentication/Cargo.toml b/framework-crates/objc2-local-authentication/Cargo.toml
index 8099d0a4d..0b08deaea 100644
--- a/framework-crates/objc2-local-authentication/Cargo.toml
+++ b/framework-crates/objc2-local-authentication/Cargo.toml
@@ -67,6 +67,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 LABase = []
 LABiometryType = []
diff --git a/framework-crates/objc2-local-authentication/src/lib.rs b/framework-crates/objc2-local-authentication/src/lib.rs
index 493c5eb53..48212e91b 100644
--- a/framework-crates/objc2-local-authentication/src/lib.rs
+++ b/framework-crates/objc2-local-authentication/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/localauthentication/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-local-authentication/0.3.1")]
diff --git a/framework-crates/objc2-mail-kit/Cargo.toml b/framework-crates/objc2-mail-kit/Cargo.toml
index 21889a95d..3ef93e0c4 100644
--- a/framework-crates/objc2-mail-kit/Cargo.toml
+++ b/framework-crates/objc2-mail-kit/Cargo.toml
@@ -68,6 +68,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 MEAddressAnnotation = [
     "objc2-foundation/NSObject",
diff --git a/framework-crates/objc2-mail-kit/src/lib.rs b/framework-crates/objc2-mail-kit/src/lib.rs
index 424ba4dbd..0cf94c83f 100644
--- a/framework-crates/objc2-mail-kit/src/lib.rs
+++ b/framework-crates/objc2-mail-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/mailkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-mail-kit/0.3.1")]
diff --git a/framework-crates/objc2-map-kit/Cargo.toml b/framework-crates/objc2-map-kit/Cargo.toml
index fb4bb2155..12679df4c 100644
--- a/framework-crates/objc2-map-kit/Cargo.toml
+++ b/framework-crates/objc2-map-kit/Cargo.toml
@@ -170,6 +170,7 @@ objc2-contacts = ["dep:objc2-contacts"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-location = ["dep:objc2-core-location"]
+unstable-darwin-objc = []
 
 MKAddress = ["objc2-foundation/NSString"]
 MKAddressFilter = [
diff --git a/framework-crates/objc2-map-kit/src/lib.rs b/framework-crates/objc2-map-kit/src/lib.rs
index 58ecfa7ab..ece9a2f12 100644
--- a/framework-crates/objc2-map-kit/src/lib.rs
+++ b/framework-crates/objc2-map-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/mapkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-map-kit/0.3.1")]
diff --git a/framework-crates/objc2-media-accessibility/Cargo.toml b/framework-crates/objc2-media-accessibility/Cargo.toml
index 5211772ff..2090f2995 100644
--- a/framework-crates/objc2-media-accessibility/Cargo.toml
+++ b/framework-crates/objc2-media-accessibility/Cargo.toml
@@ -73,6 +73,7 @@ objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-text = ["dep:objc2-core-text"]
 objc2-foundation = ["dep:objc2-foundation"]
 objc2-io-surface = ["dep:objc2-io-surface"]
+unstable-darwin-objc = []
 
 MAAudibleMedia = ["objc2-core-foundation/CFArray"]
 MACaptionAppearance = [
diff --git a/framework-crates/objc2-media-accessibility/src/lib.rs b/framework-crates/objc2-media-accessibility/src/lib.rs
index 983d4a262..dc0a3290a 100644
--- a/framework-crates/objc2-media-accessibility/src/lib.rs
+++ b/framework-crates/objc2-media-accessibility/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/mediaaccessibility/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-media-accessibility/0.3.1")]
diff --git a/framework-crates/objc2-media-extension/Cargo.toml b/framework-crates/objc2-media-extension/Cargo.toml
index fa3af2322..b5723913d 100644
--- a/framework-crates/objc2-media-extension/Cargo.toml
+++ b/framework-crates/objc2-media-extension/Cargo.toml
@@ -77,6 +77,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-media = ["dep:objc2-core-media"]
 objc2-core-video = ["dep:objc2-core-video"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 MEError = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-media-extension/src/lib.rs b/framework-crates/objc2-media-extension/src/lib.rs
index 46dabe494..4e56a828b 100644
--- a/framework-crates/objc2-media-extension/src/lib.rs
+++ b/framework-crates/objc2-media-extension/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/mediaextension/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-media-extension/0.3.1")]
diff --git a/framework-crates/objc2-media-player/Cargo.toml b/framework-crates/objc2-media-player/Cargo.toml
index 9c7e70bf5..d3c0f215f 100644
--- a/framework-crates/objc2-media-player/Cargo.toml
+++ b/framework-crates/objc2-media-player/Cargo.toml
@@ -102,6 +102,7 @@ objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-av-foundation = ["dep:objc2-av-foundation"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-media = ["dep:objc2-core-media"]
+unstable-darwin-objc = []
 
 AVFoundation_MPNowPlayingInfoLanguageOptionAdditions = []
 AVPlayerItem_MediaPlayerAdditions = [
diff --git a/framework-crates/objc2-media-player/src/lib.rs b/framework-crates/objc2-media-player/src/lib.rs
index 605dce670..1461fb833 100644
--- a/framework-crates/objc2-media-player/src/lib.rs
+++ b/framework-crates/objc2-media-player/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/mediaplayer/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-media-player/0.3.1")]
diff --git a/framework-crates/objc2-media-setup/Cargo.toml b/framework-crates/objc2-media-setup/Cargo.toml
index 2fac044c0..a42366f08 100644
--- a/framework-crates/objc2-media-setup/Cargo.toml
+++ b/framework-crates/objc2-media-setup/Cargo.toml
@@ -44,6 +44,7 @@ default = [
 std = ["alloc"]
 alloc = []
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 MSServiceAccount = [
     "objc2-foundation/NSString",
diff --git a/framework-crates/objc2-media-setup/src/lib.rs b/framework-crates/objc2-media-setup/src/lib.rs
index 640d2813b..19e41de1a 100644
--- a/framework-crates/objc2-media-setup/src/lib.rs
+++ b/framework-crates/objc2-media-setup/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/mediasetup/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-media-setup/0.3.1")]
diff --git a/framework-crates/objc2-media-toolbox/Cargo.toml b/framework-crates/objc2-media-toolbox/Cargo.toml
index 5f2e8b74a..308817c29 100644
--- a/framework-crates/objc2-media-toolbox/Cargo.toml
+++ b/framework-crates/objc2-media-toolbox/Cargo.toml
@@ -58,6 +58,7 @@ objc2 = [
 ]
 objc2-core-audio-types = ["dep:objc2-core-audio-types"]
 objc2-core-media = ["dep:objc2-core-media"]
+unstable-darwin-objc = []
 
 MTAudioProcessingTap = []
 MTFormatNames = []
diff --git a/framework-crates/objc2-media-toolbox/src/lib.rs b/framework-crates/objc2-media-toolbox/src/lib.rs
index e0daf12bb..7c6fe859c 100644
--- a/framework-crates/objc2-media-toolbox/src/lib.rs
+++ b/framework-crates/objc2-media-toolbox/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/mediatoolbox/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-media-toolbox/0.3.1")]
diff --git a/framework-crates/objc2-message-ui/Cargo.toml b/framework-crates/objc2-message-ui/Cargo.toml
index bdb8a3037..b21ff0af8 100644
--- a/framework-crates/objc2-message-ui/Cargo.toml
+++ b/framework-crates/objc2-message-ui/Cargo.toml
@@ -57,6 +57,7 @@ alloc = []
 block2 = ["dep:block2"]
 objc2-messages = ["dep:objc2-messages"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 MFMailComposeControllerDeferredAction = []
 MFMailComposeViewController = [
diff --git a/framework-crates/objc2-message-ui/src/lib.rs b/framework-crates/objc2-message-ui/src/lib.rs
index 8fc6b9071..45c65f089 100644
--- a/framework-crates/objc2-message-ui/src/lib.rs
+++ b/framework-crates/objc2-message-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/messageui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-message-ui/0.3.1")]
diff --git a/framework-crates/objc2-messages/Cargo.toml b/framework-crates/objc2-messages/Cargo.toml
index 5d2aa06b4..4ebccf0a0 100644
--- a/framework-crates/objc2-messages/Cargo.toml
+++ b/framework-crates/objc2-messages/Cargo.toml
@@ -75,6 +75,7 @@ block2 = ["dep:block2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 MSConversation = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-messages/src/lib.rs b/framework-crates/objc2-messages/src/lib.rs
index 31c972a8e..324c8a283 100644
--- a/framework-crates/objc2-messages/src/lib.rs
+++ b/framework-crates/objc2-messages/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/messages/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-messages/0.3.1")]
diff --git a/framework-crates/objc2-metal-fx/Cargo.toml b/framework-crates/objc2-metal-fx/Cargo.toml
index f3154af30..c7c9121d9 100644
--- a/framework-crates/objc2-metal-fx/Cargo.toml
+++ b/framework-crates/objc2-metal-fx/Cargo.toml
@@ -46,6 +46,7 @@ default = [
 ]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
 
 MTL4FXFrameInterpolator = ["objc2-metal/MTL4CommandBuffer"]
 MTL4FXSpatialScaler = ["objc2-metal/MTL4CommandBuffer"]
diff --git a/framework-crates/objc2-metal-fx/src/lib.rs b/framework-crates/objc2-metal-fx/src/lib.rs
index 392eacda2..62ad7f43e 100644
--- a/framework-crates/objc2-metal-fx/src/lib.rs
+++ b/framework-crates/objc2-metal-fx/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/metalfx/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-metal-fx/0.3.1")]
diff --git a/framework-crates/objc2-metal-kit/Cargo.toml b/framework-crates/objc2-metal-kit/Cargo.toml
index 1ff819395..b81e8f56c 100644
--- a/framework-crates/objc2-metal-kit/Cargo.toml
+++ b/framework-crates/objc2-metal-kit/Cargo.toml
@@ -89,6 +89,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-model-io = ["dep:objc2-model-io"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
+unstable-darwin-objc = []
 
 MTKDefines = []
 MTKModel = [
diff --git a/framework-crates/objc2-metal-kit/src/lib.rs b/framework-crates/objc2-metal-kit/src/lib.rs
index 402f15f94..df0389df8 100644
--- a/framework-crates/objc2-metal-kit/src/lib.rs
+++ b/framework-crates/objc2-metal-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/metalkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-metal-kit/0.3.1")]
diff --git a/framework-crates/objc2-metal-performance-shaders-graph/Cargo.toml b/framework-crates/objc2-metal-performance-shaders-graph/Cargo.toml
index 8bfb57768..929311ae6 100644
--- a/framework-crates/objc2-metal-performance-shaders-graph/Cargo.toml
+++ b/framework-crates/objc2-metal-performance-shaders-graph/Cargo.toml
@@ -102,6 +102,7 @@ bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-metal-performance-shaders = ["dep:objc2-metal-performance-shaders"]
+unstable-darwin-objc = []
 
 MPSGraph = [
     "bitflags",
diff --git a/framework-crates/objc2-metal-performance-shaders-graph/src/lib.rs b/framework-crates/objc2-metal-performance-shaders-graph/src/lib.rs
index c68b1f270..93dbd8f5c 100644
--- a/framework-crates/objc2-metal-performance-shaders-graph/src/lib.rs
+++ b/framework-crates/objc2-metal-performance-shaders-graph/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/metalperformanceshadersgraph/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-metal-performance-shaders-graph/0.3.1")]
diff --git a/framework-crates/objc2-metal-performance-shaders/Cargo.toml b/framework-crates/objc2-metal-performance-shaders/Cargo.toml
index 44e2769e0..439330706 100644
--- a/framework-crates/objc2-metal-performance-shaders/Cargo.toml
+++ b/framework-crates/objc2-metal-performance-shaders/Cargo.toml
@@ -148,6 +148,7 @@ alloc = []
 block2 = ["dep:block2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 MPSAccelerationStructure = [
     "objc2-foundation/NSCoder",
diff --git a/framework-crates/objc2-metal-performance-shaders/src/lib.rs b/framework-crates/objc2-metal-performance-shaders/src/lib.rs
index 9618e3449..ea295751e 100644
--- a/framework-crates/objc2-metal-performance-shaders/src/lib.rs
+++ b/framework-crates/objc2-metal-performance-shaders/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/metalperformanceshaders/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-metal-performance-shaders/0.3.1")]
diff --git a/framework-crates/objc2-metal/Cargo.toml b/framework-crates/objc2-metal/Cargo.toml
index a2be4cbc1..595142580 100644
--- a/framework-crates/objc2-metal/Cargo.toml
+++ b/framework-crates/objc2-metal/Cargo.toml
@@ -200,6 +200,7 @@ block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-io-surface = ["dep:objc2-io-surface"]
+unstable-darwin-objc = []
 
 MTL4AccelerationStructure = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-metal/src/lib.rs b/framework-crates/objc2-metal/src/lib.rs
index ecf8dc621..ca47db6e6 100644
--- a/framework-crates/objc2-metal/src/lib.rs
+++ b/framework-crates/objc2-metal/src/lib.rs
@@ -26,6 +26,7 @@
 #![recursion_limit = "256"]
 #![allow(non_snake_case)]
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-metal/0.3.1")]
diff --git a/framework-crates/objc2-metric-kit/Cargo.toml b/framework-crates/objc2-metric-kit/Cargo.toml
index a43931c49..1a5f69d0b 100644
--- a/framework-crates/objc2-metric-kit/Cargo.toml
+++ b/framework-crates/objc2-metric-kit/Cargo.toml
@@ -74,6 +74,7 @@ default = [
 std = ["alloc"]
 alloc = []
 libc = ["dep:libc"]
+unstable-darwin-objc = []
 
 MXAnimationMetric = [
     "objc2-foundation/NSMeasurement",
diff --git a/framework-crates/objc2-metric-kit/src/lib.rs b/framework-crates/objc2-metric-kit/src/lib.rs
index cc9a0adc2..094cf836e 100644
--- a/framework-crates/objc2-metric-kit/src/lib.rs
+++ b/framework-crates/objc2-metric-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/metrickit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-metric-kit/0.3.1")]
diff --git a/framework-crates/objc2-ml-compute/Cargo.toml b/framework-crates/objc2-ml-compute/Cargo.toml
index 711454cc1..85a7ecf60 100644
--- a/framework-crates/objc2-ml-compute/Cargo.toml
+++ b/framework-crates/objc2-ml-compute/Cargo.toml
@@ -103,6 +103,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-metal = ["dep:objc2-metal"]
+unstable-darwin-objc = []
 
 MLCActivationDescriptor = ["objc2-foundation/NSObject"]
 MLCActivationLayer = []
diff --git a/framework-crates/objc2-ml-compute/src/lib.rs b/framework-crates/objc2-ml-compute/src/lib.rs
index 391d81be5..b47b07294 100644
--- a/framework-crates/objc2-ml-compute/src/lib.rs
+++ b/framework-crates/objc2-ml-compute/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/mlcompute/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-ml-compute/0.3.1")]
diff --git a/framework-crates/objc2-model-io/Cargo.toml b/framework-crates/objc2-model-io/Cargo.toml
index 3237c4b12..26be89c3f 100644
--- a/framework-crates/objc2-model-io/Cargo.toml
+++ b/framework-crates/objc2-model-io/Cargo.toml
@@ -70,6 +70,7 @@ alloc = []
 block2 = ["dep:block2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 MDLAnimatedValueTypes = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-model-io/src/lib.rs b/framework-crates/objc2-model-io/src/lib.rs
index c7f95e5ef..f2d95b5bc 100644
--- a/framework-crates/objc2-model-io/src/lib.rs
+++ b/framework-crates/objc2-model-io/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/modelio/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-model-io/0.3.1")]
diff --git a/framework-crates/objc2-multipeer-connectivity/Cargo.toml b/framework-crates/objc2-multipeer-connectivity/Cargo.toml
index 5b273b935..7264fa65b 100644
--- a/framework-crates/objc2-multipeer-connectivity/Cargo.toml
+++ b/framework-crates/objc2-multipeer-connectivity/Cargo.toml
@@ -60,6 +60,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 MCAdvertiserAssistant = [
     "objc2-foundation/NSDictionary",
diff --git a/framework-crates/objc2-multipeer-connectivity/src/lib.rs b/framework-crates/objc2-multipeer-connectivity/src/lib.rs
index f2690ec7a..20bd6d3e0 100644
--- a/framework-crates/objc2-multipeer-connectivity/src/lib.rs
+++ b/framework-crates/objc2-multipeer-connectivity/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/multipeerconnectivity/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-multipeer-connectivity/0.3.1")]
diff --git a/framework-crates/objc2-natural-language/Cargo.toml b/framework-crates/objc2-natural-language/Cargo.toml
index 8b03d5424..1c510b73b 100644
--- a/framework-crates/objc2-natural-language/Cargo.toml
+++ b/framework-crates/objc2-natural-language/Cargo.toml
@@ -57,6 +57,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-core-ml = ["dep:objc2-core-ml"]
+unstable-darwin-objc = []
 
 NLContextualEmbedding = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-natural-language/src/lib.rs b/framework-crates/objc2-natural-language/src/lib.rs
index 75774585d..2283d4966 100644
--- a/framework-crates/objc2-natural-language/src/lib.rs
+++ b/framework-crates/objc2-natural-language/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/naturallanguage/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-natural-language/0.3.1")]
diff --git a/framework-crates/objc2-nearby-interaction/Cargo.toml b/framework-crates/objc2-nearby-interaction/Cargo.toml
index f3d887918..32c0489ff 100644
--- a/framework-crates/objc2-nearby-interaction/Cargo.toml
+++ b/framework-crates/objc2-nearby-interaction/Cargo.toml
@@ -58,6 +58,7 @@ std = ["alloc"]
 alloc = []
 dispatch2 = ["dep:dispatch2"]
 objc2-ar-kit = ["dep:objc2-ar-kit"]
+unstable-darwin-objc = []
 
 NIAlgorithmConvergenceStatusReason = ["objc2-foundation/NSString"]
 NIConfiguration = [
diff --git a/framework-crates/objc2-nearby-interaction/src/lib.rs b/framework-crates/objc2-nearby-interaction/src/lib.rs
index 0a4a25579..cbecda192 100644
--- a/framework-crates/objc2-nearby-interaction/src/lib.rs
+++ b/framework-crates/objc2-nearby-interaction/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/nearbyinteraction/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-nearby-interaction/0.3.1")]
diff --git a/framework-crates/objc2-network-extension/Cargo.toml b/framework-crates/objc2-network-extension/Cargo.toml
index 58c5999bf..661bd43aa 100644
--- a/framework-crates/objc2-network-extension/Cargo.toml
+++ b/framework-crates/objc2-network-extension/Cargo.toml
@@ -78,3 +78,4 @@ dispatch2 = ["dep:dispatch2"]
 libc = ["dep:libc"]
 objc2-accessory-setup-kit = ["dep:objc2-accessory-setup-kit"]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-network-extension/src/lib.rs b/framework-crates/objc2-network-extension/src/lib.rs
index 3d3145261..cb8a9a5fe 100644
--- a/framework-crates/objc2-network-extension/src/lib.rs
+++ b/framework-crates/objc2-network-extension/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/networkextension/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-network-extension/0.3.1")]
diff --git a/framework-crates/objc2-notification-center/Cargo.toml b/framework-crates/objc2-notification-center/Cargo.toml
index b37c79a60..f0a195712 100644
--- a/framework-crates/objc2-notification-center/Cargo.toml
+++ b/framework-crates/objc2-notification-center/Cargo.toml
@@ -54,6 +54,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 NCWidgetController = ["objc2-foundation/NSString"]
 NCWidgetListViewController = [
diff --git a/framework-crates/objc2-notification-center/src/lib.rs b/framework-crates/objc2-notification-center/src/lib.rs
index 67eb7d186..539156929 100644
--- a/framework-crates/objc2-notification-center/src/lib.rs
+++ b/framework-crates/objc2-notification-center/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/notificationcenter/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-notification-center/0.3.1")]
diff --git a/framework-crates/objc2-open-directory/Cargo.toml b/framework-crates/objc2-open-directory/Cargo.toml
index 4bff90b3c..36f813085 100644
--- a/framework-crates/objc2-open-directory/Cargo.toml
+++ b/framework-crates/objc2-open-directory/Cargo.toml
@@ -72,6 +72,7 @@ alloc = []
 dispatch2 = ["dep:dispatch2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-security-foundation = ["dep:objc2-security-foundation"]
+unstable-darwin-objc = []
 
 CFODContext = []
 CFODNode = ["objc2-foundation/NSString"]
diff --git a/framework-crates/objc2-open-directory/src/lib.rs b/framework-crates/objc2-open-directory/src/lib.rs
index d67607629..e8df84773 100644
--- a/framework-crates/objc2-open-directory/src/lib.rs
+++ b/framework-crates/objc2-open-directory/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/opendirectory/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-open-directory/0.3.1")]
diff --git a/framework-crates/objc2-open-gl-es/Cargo.toml b/framework-crates/objc2-open-gl-es/Cargo.toml
index 6f76ae274..a7ac028ff 100644
--- a/framework-crates/objc2-open-gl-es/Cargo.toml
+++ b/framework-crates/objc2-open-gl-es/Cargo.toml
@@ -50,6 +50,7 @@ std = ["alloc"]
 alloc = []
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-io-surface = ["dep:objc2-io-surface"]
+unstable-darwin-objc = []
 
 EAGL = ["objc2-foundation/NSString"]
 EAGLDrawable = [
diff --git a/framework-crates/objc2-open-gl-es/src/lib.rs b/framework-crates/objc2-open-gl-es/src/lib.rs
index cdc906772..7fa4fba48 100644
--- a/framework-crates/objc2-open-gl-es/src/lib.rs
+++ b/framework-crates/objc2-open-gl-es/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/opengles/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-open-gl-es/0.3.1")]
diff --git a/framework-crates/objc2-open-gl/Cargo.toml b/framework-crates/objc2-open-gl/Cargo.toml
index 1ae37e8d4..e7e2ce398 100644
--- a/framework-crates/objc2-open-gl/Cargo.toml
+++ b/framework-crates/objc2-open-gl/Cargo.toml
@@ -43,6 +43,7 @@ default = [
 std = ["alloc"]
 alloc = []
 objc2-io-surface = ["dep:objc2-io-surface"]
+unstable-darwin-objc = []
 
 CGLCurrent = []
 CGLDevice = []
diff --git a/framework-crates/objc2-open-gl/src/lib.rs b/framework-crates/objc2-open-gl/src/lib.rs
index 96cdc9d44..93b09b773 100644
--- a/framework-crates/objc2-open-gl/src/lib.rs
+++ b/framework-crates/objc2-open-gl/src/lib.rs
@@ -9,6 +9,7 @@
 //! [opengl-docs]: https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_intro/opengl_intro.html
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-opengl/0.3.1")]
diff --git a/framework-crates/objc2-os-log/Cargo.toml b/framework-crates/objc2-os-log/Cargo.toml
index d22640813..91d14dfaa 100644
--- a/framework-crates/objc2-os-log/Cargo.toml
+++ b/framework-crates/objc2-os-log/Cargo.toml
@@ -54,3 +54,4 @@ default = [
 std = ["alloc"]
 alloc = []
 libc = ["dep:libc"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-os-log/src/lib.rs b/framework-crates/objc2-os-log/src/lib.rs
index fecaa399c..ba7cbb325 100644
--- a/framework-crates/objc2-os-log/src/lib.rs
+++ b/framework-crates/objc2-os-log/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/oslog/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-os-log/0.3.1")]
diff --git a/framework-crates/objc2-osa-kit/Cargo.toml b/framework-crates/objc2-osa-kit/Cargo.toml
index e37b9e265..9578223e4 100644
--- a/framework-crates/objc2-osa-kit/Cargo.toml
+++ b/framework-crates/objc2-osa-kit/Cargo.toml
@@ -42,6 +42,7 @@ default = [
 std = ["alloc"]
 alloc = []
 bitflags = ["dep:bitflags"]
+unstable-darwin-objc = []
 
 OSALanguage = [
     "bitflags",
diff --git a/framework-crates/objc2-osa-kit/src/lib.rs b/framework-crates/objc2-osa-kit/src/lib.rs
index 81aee2cc1..495c1de84 100644
--- a/framework-crates/objc2-osa-kit/src/lib.rs
+++ b/framework-crates/objc2-osa-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/osakit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-osa-kit/0.3.1")]
diff --git a/framework-crates/objc2-paravirtualized-graphics/Cargo.toml b/framework-crates/objc2-paravirtualized-graphics/Cargo.toml
index ff9ecf8b2..76a042ee7 100644
--- a/framework-crates/objc2-paravirtualized-graphics/Cargo.toml
+++ b/framework-crates/objc2-paravirtualized-graphics/Cargo.toml
@@ -63,6 +63,7 @@ block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-metal = ["dep:objc2-metal"]
+unstable-darwin-objc = []
 
 PGDefines = []
 PGDevice = [
diff --git a/framework-crates/objc2-paravirtualized-graphics/src/lib.rs b/framework-crates/objc2-paravirtualized-graphics/src/lib.rs
index 18e27b49e..087724747 100644
--- a/framework-crates/objc2-paravirtualized-graphics/src/lib.rs
+++ b/framework-crates/objc2-paravirtualized-graphics/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/paravirtualizedgraphics/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-paravirtualized-graphics/0.3.1")]
diff --git a/framework-crates/objc2-pass-kit/Cargo.toml b/framework-crates/objc2-pass-kit/Cargo.toml
index 89c5e1249..ff81ddff7 100644
--- a/framework-crates/objc2-pass-kit/Cargo.toml
+++ b/framework-crates/objc2-pass-kit/Cargo.toml
@@ -149,6 +149,7 @@ objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-contacts = ["dep:objc2-contacts"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 PKAddCarKeyPassConfiguration = ["objc2-foundation/NSString"]
 PKAddIdentityDocumentConfiguration = [
diff --git a/framework-crates/objc2-pass-kit/src/lib.rs b/framework-crates/objc2-pass-kit/src/lib.rs
index 43874866c..ce4bc9615 100644
--- a/framework-crates/objc2-pass-kit/src/lib.rs
+++ b/framework-crates/objc2-pass-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/passkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-pass-kit/0.3.1")]
diff --git a/framework-crates/objc2-pdf-kit/Cargo.toml b/framework-crates/objc2-pdf-kit/Cargo.toml
index 9320af392..cb67aad91 100644
--- a/framework-crates/objc2-pdf-kit/Cargo.toml
+++ b/framework-crates/objc2-pdf-kit/Cargo.toml
@@ -107,6 +107,7 @@ bitflags = ["dep:bitflags"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 PDFAction = [
     "objc2-foundation/NSObject",
diff --git a/framework-crates/objc2-pdf-kit/src/lib.rs b/framework-crates/objc2-pdf-kit/src/lib.rs
index 2411a0c6a..028022a56 100644
--- a/framework-crates/objc2-pdf-kit/src/lib.rs
+++ b/framework-crates/objc2-pdf-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/pdfkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-pdf-kit/0.3.1")]
diff --git a/framework-crates/objc2-pencil-kit/Cargo.toml b/framework-crates/objc2-pencil-kit/Cargo.toml
index 93c8cd780..e400befea 100644
--- a/framework-crates/objc2-pencil-kit/Cargo.toml
+++ b/framework-crates/objc2-pencil-kit/Cargo.toml
@@ -75,6 +75,7 @@ block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 PKContentVersion = []
 PKDrawing = [
diff --git a/framework-crates/objc2-pencil-kit/src/lib.rs b/framework-crates/objc2-pencil-kit/src/lib.rs
index e2c4add13..7274e35c4 100644
--- a/framework-crates/objc2-pencil-kit/src/lib.rs
+++ b/framework-crates/objc2-pencil-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/pencilkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-pencil-kit/0.3.1")]
diff --git a/framework-crates/objc2-phase/Cargo.toml b/framework-crates/objc2-phase/Cargo.toml
index 2a6dbb6bc..8f8476786 100644
--- a/framework-crates/objc2-phase/Cargo.toml
+++ b/framework-crates/objc2-phase/Cargo.toml
@@ -86,6 +86,7 @@ block2 = ["dep:block2"]
 objc2-avf-audio = ["dep:objc2-avf-audio"]
 objc2-core-audio-types = ["dep:objc2-core-audio-types"]
 objc2-model-io = ["dep:objc2-model-io"]
+unstable-darwin-objc = []
 
 PHASEAssetRegistry = [
     "objc2-foundation/NSData",
diff --git a/framework-crates/objc2-phase/src/lib.rs b/framework-crates/objc2-phase/src/lib.rs
index 5af486d08..15eea4807 100644
--- a/framework-crates/objc2-phase/src/lib.rs
+++ b/framework-crates/objc2-phase/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/phase/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-phase/0.3.1")]
diff --git a/framework-crates/objc2-photos-ui/Cargo.toml b/framework-crates/objc2-photos-ui/Cargo.toml
index 297d86125..49e0b5158 100644
--- a/framework-crates/objc2-photos-ui/Cargo.toml
+++ b/framework-crates/objc2-photos-ui/Cargo.toml
@@ -105,6 +105,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-location = ["dep:objc2-core-location"]
 objc2-map-kit = ["dep:objc2-map-kit"]
 objc2-photos = ["dep:objc2-photos"]
+unstable-darwin-objc = []
 
 PHContentEditingController = []
 PHLivePhotoView = [
diff --git a/framework-crates/objc2-photos-ui/src/lib.rs b/framework-crates/objc2-photos-ui/src/lib.rs
index 33be0469e..0b30ad022 100644
--- a/framework-crates/objc2-photos-ui/src/lib.rs
+++ b/framework-crates/objc2-photos-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/photosui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-photos-ui/0.3.1")]
diff --git a/framework-crates/objc2-photos/Cargo.toml b/framework-crates/objc2-photos/Cargo.toml
index 827145dfc..46ada99d3 100644
--- a/framework-crates/objc2-photos/Cargo.toml
+++ b/framework-crates/objc2-photos/Cargo.toml
@@ -124,6 +124,7 @@ objc2-core-location = ["dep:objc2-core-location"]
 objc2-core-media = ["dep:objc2-core-media"]
 objc2-image-io = ["dep:objc2-image-io"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 PHAdjustmentData = [
     "objc2-foundation/NSData",
diff --git a/framework-crates/objc2-photos/src/lib.rs b/framework-crates/objc2-photos/src/lib.rs
index 5c9f96685..5d240338d 100644
--- a/framework-crates/objc2-photos/src/lib.rs
+++ b/framework-crates/objc2-photos/src/lib.rs
@@ -8,6 +8,7 @@
 //! This actually lives in the `Photos` framework, but `PhotoKit` is the name
 //! that people use to refer to it.
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-photos/0.3.1")]
diff --git a/framework-crates/objc2-preference-panes/Cargo.toml b/framework-crates/objc2-preference-panes/Cargo.toml
index 3541fedd9..a48d35768 100644
--- a/framework-crates/objc2-preference-panes/Cargo.toml
+++ b/framework-crates/objc2-preference-panes/Cargo.toml
@@ -41,6 +41,7 @@ default = [
 std = ["alloc"]
 alloc = []
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 NSPreferencePane = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-preference-panes/src/lib.rs b/framework-crates/objc2-preference-panes/src/lib.rs
index f314b7d22..985d4d896 100644
--- a/framework-crates/objc2-preference-panes/src/lib.rs
+++ b/framework-crates/objc2-preference-panes/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/preferencepanes/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-preference-panes/0.3.1")]
diff --git a/framework-crates/objc2-push-kit/Cargo.toml b/framework-crates/objc2-push-kit/Cargo.toml
index f78d276e4..6a3fcb409 100644
--- a/framework-crates/objc2-push-kit/Cargo.toml
+++ b/framework-crates/objc2-push-kit/Cargo.toml
@@ -50,6 +50,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
+unstable-darwin-objc = []
 
 PKDefines = ["objc2-foundation/NSString"]
 PKPushCredentials = [
diff --git a/framework-crates/objc2-push-kit/src/lib.rs b/framework-crates/objc2-push-kit/src/lib.rs
index d78aa24e0..afa1a36c1 100644
--- a/framework-crates/objc2-push-kit/src/lib.rs
+++ b/framework-crates/objc2-push-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/pushkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-push-kit/0.3.1")]
diff --git a/framework-crates/objc2-push-to-talk/Cargo.toml b/framework-crates/objc2-push-to-talk/Cargo.toml
index 76cec360a..0eea6be12 100644
--- a/framework-crates/objc2-push-to-talk/Cargo.toml
+++ b/framework-crates/objc2-push-to-talk/Cargo.toml
@@ -51,6 +51,7 @@ alloc = []
 block2 = ["dep:block2"]
 objc2-avf-audio = ["dep:objc2-avf-audio"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 PTBase = []
 PTChannelDescriptor = ["objc2-foundation/NSString"]
diff --git a/framework-crates/objc2-push-to-talk/src/lib.rs b/framework-crates/objc2-push-to-talk/src/lib.rs
index 60eef7254..26e166363 100644
--- a/framework-crates/objc2-push-to-talk/src/lib.rs
+++ b/framework-crates/objc2-push-to-talk/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/pushtotalk/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-push-to-talk/0.3.1")]
diff --git a/framework-crates/objc2-quartz-core/Cargo.toml b/framework-crates/objc2-quartz-core/Cargo.toml
index ba28ba1c4..b00cdfe28 100644
--- a/framework-crates/objc2-quartz-core/Cargo.toml
+++ b/framework-crates/objc2-quartz-core/Cargo.toml
@@ -118,6 +118,7 @@ objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-video = ["dep:objc2-core-video"]
 objc2-metal = ["dep:objc2-metal"]
 objc2-open-gl = ["dep:objc2-open-gl"]
+unstable-darwin-objc = []
 
 CAAnimation = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-quartz-core/src/lib.rs b/framework-crates/objc2-quartz-core/src/lib.rs
index d8f3bf246..2c4a8adf8 100644
--- a/framework-crates/objc2-quartz-core/src/lib.rs
+++ b/framework-crates/objc2-quartz-core/src/lib.rs
@@ -9,6 +9,7 @@
 //! the name that people use to refer to it.
 #![recursion_limit = "256"]
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-quartz-core/0.3.1")]
diff --git a/framework-crates/objc2-quartz/Cargo.toml b/framework-crates/objc2-quartz/Cargo.toml
index 22b84383d..ed71c1b7d 100644
--- a/framework-crates/objc2-quartz/Cargo.toml
+++ b/framework-crates/objc2-quartz/Cargo.toml
@@ -83,6 +83,7 @@ objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-image = ["dep:objc2-core-image"]
 objc2-image-capture-core = ["dep:objc2-image-capture-core"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
+unstable-darwin-objc = []
 
 IKCameraDeviceView = [
     "objc2-app-kit/NSAccessibilityProtocols",
diff --git a/framework-crates/objc2-quartz/src/lib.rs b/framework-crates/objc2-quartz/src/lib.rs
index 0f3f0b46e..7c38669b5 100644
--- a/framework-crates/objc2-quartz/src/lib.rs
+++ b/framework-crates/objc2-quartz/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/quartz/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-quartz/0.3.1")]
diff --git a/framework-crates/objc2-quick-look-thumbnailing/Cargo.toml b/framework-crates/objc2-quick-look-thumbnailing/Cargo.toml
index d76d720ef..f7ab72cb1 100644
--- a/framework-crates/objc2-quick-look-thumbnailing/Cargo.toml
+++ b/framework-crates/objc2-quick-look-thumbnailing/Cargo.toml
@@ -76,6 +76,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 QLThumbnailErrors = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-quick-look-thumbnailing/src/lib.rs b/framework-crates/objc2-quick-look-thumbnailing/src/lib.rs
index 84f2e3128..f7345af6f 100644
--- a/framework-crates/objc2-quick-look-thumbnailing/src/lib.rs
+++ b/framework-crates/objc2-quick-look-thumbnailing/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/quicklookthumbnailing/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-quick-look-thumbnailing/0.3.1")]
diff --git a/framework-crates/objc2-quick-look-ui/Cargo.toml b/framework-crates/objc2-quick-look-ui/Cargo.toml
index c55a33cff..a766e3a57 100644
--- a/framework-crates/objc2-quick-look-ui/Cargo.toml
+++ b/framework-crates/objc2-quick-look-ui/Cargo.toml
@@ -80,6 +80,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-pdf-kit = ["dep:objc2-pdf-kit"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 QLFilePreviewRequest = ["objc2-foundation/NSURL"]
 QLPreviewItem = [
diff --git a/framework-crates/objc2-quick-look-ui/src/lib.rs b/framework-crates/objc2-quick-look-ui/src/lib.rs
index c1624fb14..84905e1ee 100644
--- a/framework-crates/objc2-quick-look-ui/src/lib.rs
+++ b/framework-crates/objc2-quick-look-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/quicklookui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-quick-look-ui/0.3.1")]
diff --git a/framework-crates/objc2-quick-look/Cargo.toml b/framework-crates/objc2-quick-look/Cargo.toml
index 9eda88213..a7e96fa8d 100644
--- a/framework-crates/objc2-quick-look/Cargo.toml
+++ b/framework-crates/objc2-quick-look/Cargo.toml
@@ -59,6 +59,7 @@ objc2 = [
     "objc2-core-graphics?/objc2",
 ]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
+unstable-darwin-objc = []
 
 QLBase = []
 QLGenerator = [
diff --git a/framework-crates/objc2-quick-look/src/lib.rs b/framework-crates/objc2-quick-look/src/lib.rs
index c510daabc..be1199142 100644
--- a/framework-crates/objc2-quick-look/src/lib.rs
+++ b/framework-crates/objc2-quick-look/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/quicklook/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-quick-look/0.3.1")]
diff --git a/framework-crates/objc2-replay-kit/Cargo.toml b/framework-crates/objc2-replay-kit/Cargo.toml
index bbcf5d503..76f5eb672 100644
--- a/framework-crates/objc2-replay-kit/Cargo.toml
+++ b/framework-crates/objc2-replay-kit/Cargo.toml
@@ -73,6 +73,7 @@ block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-media = ["dep:objc2-core-media"]
+unstable-darwin-objc = []
 
 RPBroadcast = [
     "objc2-foundation/NSDictionary",
diff --git a/framework-crates/objc2-replay-kit/src/lib.rs b/framework-crates/objc2-replay-kit/src/lib.rs
index 8c31fd5f6..11f4a2226 100644
--- a/framework-crates/objc2-replay-kit/src/lib.rs
+++ b/framework-crates/objc2-replay-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/replaykit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-replay-kit/0.3.1")]
diff --git a/framework-crates/objc2-safari-services/Cargo.toml b/framework-crates/objc2-safari-services/Cargo.toml
index 6c2736714..e25986d1a 100644
--- a/framework-crates/objc2-safari-services/Cargo.toml
+++ b/framework-crates/objc2-safari-services/Cargo.toml
@@ -70,6 +70,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 SFContentBlockerManager = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-safari-services/src/lib.rs b/framework-crates/objc2-safari-services/src/lib.rs
index f18661815..99e88debb 100644
--- a/framework-crates/objc2-safari-services/src/lib.rs
+++ b/framework-crates/objc2-safari-services/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/safariservices/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-safari-services/0.3.1")]
diff --git a/framework-crates/objc2-safety-kit/Cargo.toml b/framework-crates/objc2-safety-kit/Cargo.toml
index 3bf3066ed..5bf47b21b 100644
--- a/framework-crates/objc2-safety-kit/Cargo.toml
+++ b/framework-crates/objc2-safety-kit/Cargo.toml
@@ -48,6 +48,7 @@ std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
 objc2-core-location = ["dep:objc2-core-location"]
+unstable-darwin-objc = []
 
 SAAuthorizationStatus = []
 SABase = []
diff --git a/framework-crates/objc2-safety-kit/src/lib.rs b/framework-crates/objc2-safety-kit/src/lib.rs
index 799c49af0..a3bcc05db 100644
--- a/framework-crates/objc2-safety-kit/src/lib.rs
+++ b/framework-crates/objc2-safety-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/safetykit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-safety-kit/0.3.1")]
diff --git a/framework-crates/objc2-scene-kit/Cargo.toml b/framework-crates/objc2-scene-kit/Cargo.toml
index 1f5af4b5d..1a2bec5ca 100644
--- a/framework-crates/objc2-scene-kit/Cargo.toml
+++ b/framework-crates/objc2-scene-kit/Cargo.toml
@@ -189,6 +189,7 @@ objc2-metal = ["dep:objc2-metal"]
 objc2-model-io = ["dep:objc2-model-io"]
 objc2-open-gl = ["dep:objc2-open-gl"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
+unstable-darwin-objc = []
 
 ModelIO = []
 SCNAction = [
diff --git a/framework-crates/objc2-scene-kit/src/lib.rs b/framework-crates/objc2-scene-kit/src/lib.rs
index e99298f98..ba8e8c64f 100644
--- a/framework-crates/objc2-scene-kit/src/lib.rs
+++ b/framework-crates/objc2-scene-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/scenekit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-scene-kit/0.3.1")]
diff --git a/framework-crates/objc2-screen-capture-kit/Cargo.toml b/framework-crates/objc2-screen-capture-kit/Cargo.toml
index 5c76fa477..053d51c6e 100644
--- a/framework-crates/objc2-screen-capture-kit/Cargo.toml
+++ b/framework-crates/objc2-screen-capture-kit/Cargo.toml
@@ -86,6 +86,7 @@ objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-media = ["dep:objc2-core-media"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 SCContentSharingPicker = [
     "bitflags",
diff --git a/framework-crates/objc2-screen-capture-kit/src/lib.rs b/framework-crates/objc2-screen-capture-kit/src/lib.rs
index 284dbc582..4c2f2fa8d 100644
--- a/framework-crates/objc2-screen-capture-kit/src/lib.rs
+++ b/framework-crates/objc2-screen-capture-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/screencapturekit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-screen-capture-kit/0.3.1")]
diff --git a/framework-crates/objc2-screen-saver/Cargo.toml b/framework-crates/objc2-screen-saver/Cargo.toml
index 033a1c8c4..01df335d1 100644
--- a/framework-crates/objc2-screen-saver/Cargo.toml
+++ b/framework-crates/objc2-screen-saver/Cargo.toml
@@ -48,6 +48,7 @@ default = [
 std = ["alloc"]
 alloc = []
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 ScreenSaverDefaults = [
     "objc2-foundation/NSString",
diff --git a/framework-crates/objc2-screen-saver/src/lib.rs b/framework-crates/objc2-screen-saver/src/lib.rs
index e48f16802..e06ada648 100644
--- a/framework-crates/objc2-screen-saver/src/lib.rs
+++ b/framework-crates/objc2-screen-saver/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/screensaver/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-screen-saver/0.3.1")]
diff --git a/framework-crates/objc2-screen-time/Cargo.toml b/framework-crates/objc2-screen-time/Cargo.toml
index d25b99eae..72265173c 100644
--- a/framework-crates/objc2-screen-time/Cargo.toml
+++ b/framework-crates/objc2-screen-time/Cargo.toml
@@ -58,6 +58,7 @@ alloc = []
 block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 STScreenTimeConfiguration = []
 STWebHistory = [
diff --git a/framework-crates/objc2-screen-time/src/lib.rs b/framework-crates/objc2-screen-time/src/lib.rs
index 4c4478318..d4cceb906 100644
--- a/framework-crates/objc2-screen-time/src/lib.rs
+++ b/framework-crates/objc2-screen-time/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/screentime/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-screen-time/0.3.1")]
diff --git a/framework-crates/objc2-scripting-bridge/Cargo.toml b/framework-crates/objc2-scripting-bridge/Cargo.toml
index 68db3cc3e..7224850b7 100644
--- a/framework-crates/objc2-scripting-bridge/Cargo.toml
+++ b/framework-crates/objc2-scripting-bridge/Cargo.toml
@@ -49,6 +49,7 @@ std = ["alloc"]
 alloc = []
 libc = ["dep:libc"]
 objc2-core-services = ["dep:objc2-core-services"]
+unstable-darwin-objc = []
 
 SBApplication = [
     "objc2-foundation/NSDictionary",
diff --git a/framework-crates/objc2-scripting-bridge/src/lib.rs b/framework-crates/objc2-scripting-bridge/src/lib.rs
index bb394f1dc..8531c69bb 100644
--- a/framework-crates/objc2-scripting-bridge/src/lib.rs
+++ b/framework-crates/objc2-scripting-bridge/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/scriptingbridge/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-scripting-bridge/0.3.1")]
diff --git a/framework-crates/objc2-security-foundation/Cargo.toml b/framework-crates/objc2-security-foundation/Cargo.toml
index f79e5f2ca..86788eb56 100644
--- a/framework-crates/objc2-security-foundation/Cargo.toml
+++ b/framework-crates/objc2-security-foundation/Cargo.toml
@@ -42,6 +42,7 @@ default = [
 std = ["alloc"]
 alloc = []
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 SFAuthorization = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-security-foundation/src/lib.rs b/framework-crates/objc2-security-foundation/src/lib.rs
index 779d7d1db..6c7184a27 100644
--- a/framework-crates/objc2-security-foundation/src/lib.rs
+++ b/framework-crates/objc2-security-foundation/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/securityfoundation/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-security-foundation/0.3.1")]
diff --git a/framework-crates/objc2-security-interface/Cargo.toml b/framework-crates/objc2-security-interface/Cargo.toml
index 64096815d..2a6d1c31d 100644
--- a/framework-crates/objc2-security-interface/Cargo.toml
+++ b/framework-crates/objc2-security-interface/Cargo.toml
@@ -57,6 +57,7 @@ std = ["alloc"]
 alloc = []
 objc2-security = ["dep:objc2-security"]
 objc2-security-foundation = ["dep:objc2-security-foundation"]
+unstable-darwin-objc = []
 
 SFAuthorizationPluginView = [
     "objc2-app-kit/NSResponder",
diff --git a/framework-crates/objc2-security-interface/src/lib.rs b/framework-crates/objc2-security-interface/src/lib.rs
index 9648c37b6..0f91014e4 100644
--- a/framework-crates/objc2-security-interface/src/lib.rs
+++ b/framework-crates/objc2-security-interface/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/securityinterface/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-security-interface/0.3.1")]
diff --git a/framework-crates/objc2-security/Cargo.toml b/framework-crates/objc2-security/Cargo.toml
index 54d66fed9..354ee2715 100644
--- a/framework-crates/objc2-security/Cargo.toml
+++ b/framework-crates/objc2-security/Cargo.toml
@@ -133,6 +133,7 @@ objc2 = [
     "dep:objc2",
     "objc2-core-foundation/objc2",
 ]
+unstable-darwin-objc = []
 
 AuthSession = ["bitflags"]
 Authorization = ["bitflags"]
diff --git a/framework-crates/objc2-security/src/lib.rs b/framework-crates/objc2-security/src/lib.rs
index 9b31e6ba4..6b5bdc548 100644
--- a/framework-crates/objc2-security/src/lib.rs
+++ b/framework-crates/objc2-security/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/security/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-security/0.3.1")]
diff --git a/framework-crates/objc2-sensitive-content-analysis/Cargo.toml b/framework-crates/objc2-sensitive-content-analysis/Cargo.toml
index 7426d2324..a1dcfbe47 100644
--- a/framework-crates/objc2-sensitive-content-analysis/Cargo.toml
+++ b/framework-crates/objc2-sensitive-content-analysis/Cargo.toml
@@ -64,6 +64,7 @@ objc2-av-foundation = ["dep:objc2-av-foundation"]
 objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-video = ["dep:objc2-core-video"]
 objc2-video-toolbox = ["dep:objc2-video-toolbox"]
+unstable-darwin-objc = []
 
 SCSensitivityAnalysis = []
 SCSensitivityAnalyzer = [
diff --git a/framework-crates/objc2-sensitive-content-analysis/src/lib.rs b/framework-crates/objc2-sensitive-content-analysis/src/lib.rs
index a559343dc..3b43e42ba 100644
--- a/framework-crates/objc2-sensitive-content-analysis/src/lib.rs
+++ b/framework-crates/objc2-sensitive-content-analysis/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/sensitivecontentanalysis/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-sensitive-content-analysis/0.3.1")]
diff --git a/framework-crates/objc2-sensor-kit/Cargo.toml b/framework-crates/objc2-sensor-kit/Cargo.toml
index 30c859f04..bb8bd5053 100644
--- a/framework-crates/objc2-sensor-kit/Cargo.toml
+++ b/framework-crates/objc2-sensor-kit/Cargo.toml
@@ -82,3 +82,4 @@ objc2-core-location = ["dep:objc2-core-location"]
 objc2-core-media = ["dep:objc2-core-media"]
 objc2-sound-analysis = ["dep:objc2-sound-analysis"]
 objc2-speech = ["dep:objc2-speech"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-sensor-kit/src/lib.rs b/framework-crates/objc2-sensor-kit/src/lib.rs
index e5a810dc4..28467f4f2 100644
--- a/framework-crates/objc2-sensor-kit/src/lib.rs
+++ b/framework-crates/objc2-sensor-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/sensorkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-sensor-kit/0.3.1")]
diff --git a/framework-crates/objc2-service-management/Cargo.toml b/framework-crates/objc2-service-management/Cargo.toml
index 12fd87e32..1afbadd98 100644
--- a/framework-crates/objc2-service-management/Cargo.toml
+++ b/framework-crates/objc2-service-management/Cargo.toml
@@ -63,6 +63,7 @@ objc2 = [
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-foundation = ["dep:objc2-foundation"]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 SMAppService = []
 SMErrors = []
diff --git a/framework-crates/objc2-service-management/src/lib.rs b/framework-crates/objc2-service-management/src/lib.rs
index 9eac4d3f2..edfcbc135 100644
--- a/framework-crates/objc2-service-management/src/lib.rs
+++ b/framework-crates/objc2-service-management/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/servicemanagement/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-service-management/0.3.1")]
diff --git a/framework-crates/objc2-shared-with-you-core/Cargo.toml b/framework-crates/objc2-shared-with-you-core/Cargo.toml
index 0c5b9eb69..07f485929 100644
--- a/framework-crates/objc2-shared-with-you-core/Cargo.toml
+++ b/framework-crates/objc2-shared-with-you-core/Cargo.toml
@@ -51,6 +51,7 @@ default = [
 ]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
 
 SWAction = [
     "objc2-foundation/NSObject",
diff --git a/framework-crates/objc2-shared-with-you-core/src/lib.rs b/framework-crates/objc2-shared-with-you-core/src/lib.rs
index 3395f3271..5542a7529 100644
--- a/framework-crates/objc2-shared-with-you-core/src/lib.rs
+++ b/framework-crates/objc2-shared-with-you-core/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/sharedwithyoucore/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-shared-with-you-core/0.3.1")]
diff --git a/framework-crates/objc2-shared-with-you/Cargo.toml b/framework-crates/objc2-shared-with-you/Cargo.toml
index cf431c58f..2a1ceb829 100644
--- a/framework-crates/objc2-shared-with-you/Cargo.toml
+++ b/framework-crates/objc2-shared-with-you/Cargo.toml
@@ -91,6 +91,7 @@ objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-shared-with-you-core = ["dep:objc2-shared-with-you-core"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 NSItemProvider_SWCollaborationMetadata = ["objc2-foundation/NSString"]
 NSPasteboardItem_SWCollaborationMetadata = []
diff --git a/framework-crates/objc2-shared-with-you/src/lib.rs b/framework-crates/objc2-shared-with-you/src/lib.rs
index b78e47233..27e826873 100644
--- a/framework-crates/objc2-shared-with-you/src/lib.rs
+++ b/framework-crates/objc2-shared-with-you/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/sharedwithyou/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-shared-with-you/0.3.1")]
diff --git a/framework-crates/objc2-shazam-kit/Cargo.toml b/framework-crates/objc2-shazam-kit/Cargo.toml
index 2d260c55b..ee8c1f4a9 100644
--- a/framework-crates/objc2-shazam-kit/Cargo.toml
+++ b/framework-crates/objc2-shazam-kit/Cargo.toml
@@ -66,6 +66,7 @@ block2 = ["dep:block2"]
 objc2-av-foundation = ["dep:objc2-av-foundation"]
 objc2-avf-audio = ["dep:objc2-avf-audio"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
+unstable-darwin-objc = []
 
 SHCatalog = ["objc2-foundation/NSDate"]
 SHCustomCatalog = [
diff --git a/framework-crates/objc2-shazam-kit/src/lib.rs b/framework-crates/objc2-shazam-kit/src/lib.rs
index 97fe20a96..3f1c74a99 100644
--- a/framework-crates/objc2-shazam-kit/src/lib.rs
+++ b/framework-crates/objc2-shazam-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/shazamkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-shazam-kit/0.3.1")]
diff --git a/framework-crates/objc2-social/Cargo.toml b/framework-crates/objc2-social/Cargo.toml
index dea4a750e..2b54a2564 100644
--- a/framework-crates/objc2-social/Cargo.toml
+++ b/framework-crates/objc2-social/Cargo.toml
@@ -60,6 +60,7 @@ alloc = []
 block2 = ["dep:block2"]
 objc2-accounts = ["dep:objc2-accounts"]
 objc2-app-kit = ["dep:objc2-app-kit"]
+unstable-darwin-objc = []
 
 SLComposeServiceViewController = [
     "objc2-foundation/NSBundle",
diff --git a/framework-crates/objc2-social/src/lib.rs b/framework-crates/objc2-social/src/lib.rs
index 279849c6e..0c592fa81 100644
--- a/framework-crates/objc2-social/src/lib.rs
+++ b/framework-crates/objc2-social/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/social/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-social/0.3.1")]
diff --git a/framework-crates/objc2-sound-analysis/Cargo.toml b/framework-crates/objc2-sound-analysis/Cargo.toml
index 02835fe58..3671575f8 100644
--- a/framework-crates/objc2-sound-analysis/Cargo.toml
+++ b/framework-crates/objc2-sound-analysis/Cargo.toml
@@ -67,6 +67,7 @@ block2 = ["dep:block2"]
 objc2-avf-audio = ["dep:objc2-avf-audio"]
 objc2-core-media = ["dep:objc2-core-media"]
 objc2-core-ml = ["dep:objc2-core-ml"]
+unstable-darwin-objc = []
 
 SNAnalyzer = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-sound-analysis/src/lib.rs b/framework-crates/objc2-sound-analysis/src/lib.rs
index 23ac6c0f3..645ab3ca0 100644
--- a/framework-crates/objc2-sound-analysis/src/lib.rs
+++ b/framework-crates/objc2-sound-analysis/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/soundanalysis/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-sound-analysis/0.3.1")]
diff --git a/framework-crates/objc2-speech/Cargo.toml b/framework-crates/objc2-speech/Cargo.toml
index 4edecd6c1..9c5b27d0f 100644
--- a/framework-crates/objc2-speech/Cargo.toml
+++ b/framework-crates/objc2-speech/Cargo.toml
@@ -62,6 +62,7 @@ alloc = []
 block2 = ["dep:block2"]
 objc2-avf-audio = ["dep:objc2-avf-audio"]
 objc2-core-media = ["dep:objc2-core-media"]
+unstable-darwin-objc = []
 
 SFErrors = [
     "objc2-foundation/NSError",
diff --git a/framework-crates/objc2-speech/src/lib.rs b/framework-crates/objc2-speech/src/lib.rs
index 945103a7d..5f40fd39f 100644
--- a/framework-crates/objc2-speech/src/lib.rs
+++ b/framework-crates/objc2-speech/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/speech/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-speech/0.3.1")]
diff --git a/framework-crates/objc2-sprite-kit/Cargo.toml b/framework-crates/objc2-sprite-kit/Cargo.toml
index 8ab2902cf..0e5deb7f8 100644
--- a/framework-crates/objc2-sprite-kit/Cargo.toml
+++ b/framework-crates/objc2-sprite-kit/Cargo.toml
@@ -151,6 +151,7 @@ objc2-core-graphics = ["dep:objc2-core-graphics"]
 objc2-core-image = ["dep:objc2-core-image"]
 objc2-gl-kit = ["dep:objc2-gl-kit"]
 objc2-metal = ["dep:objc2-metal"]
+unstable-darwin-objc = []
 
 SK3DNode = [
     "objc2-foundation/NSCoder",
diff --git a/framework-crates/objc2-sprite-kit/src/lib.rs b/framework-crates/objc2-sprite-kit/src/lib.rs
index c5abab408..fda91d8d8 100644
--- a/framework-crates/objc2-sprite-kit/src/lib.rs
+++ b/framework-crates/objc2-sprite-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/spritekit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-sprite-kit/0.3.1")]
diff --git a/framework-crates/objc2-store-kit/Cargo.toml b/framework-crates/objc2-store-kit/Cargo.toml
index 8652ab634..d9c80b361 100644
--- a/framework-crates/objc2-store-kit/Cargo.toml
+++ b/framework-crates/objc2-store-kit/Cargo.toml
@@ -96,6 +96,7 @@ block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-background-assets = ["dep:objc2-background-assets"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
+unstable-darwin-objc = []
 
 SKANError = ["objc2-foundation/NSString"]
 SKAdImpression = [
diff --git a/framework-crates/objc2-store-kit/src/lib.rs b/framework-crates/objc2-store-kit/src/lib.rs
index bb34b2ee6..337f0c65d 100644
--- a/framework-crates/objc2-store-kit/src/lib.rs
+++ b/framework-crates/objc2-store-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/storekit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-store-kit/0.3.1")]
diff --git a/framework-crates/objc2-symbols/Cargo.toml b/framework-crates/objc2-symbols/Cargo.toml
index 86459193b..83f2decd7 100644
--- a/framework-crates/objc2-symbols/Cargo.toml
+++ b/framework-crates/objc2-symbols/Cargo.toml
@@ -39,5 +39,6 @@ default = [
 ]
 std = ["alloc"]
 alloc = []
+unstable-darwin-objc = []
 
 NSSymbolEffect = ["objc2-foundation/NSObject"]
diff --git a/framework-crates/objc2-symbols/src/lib.rs b/framework-crates/objc2-symbols/src/lib.rs
index 199bc110a..244dff081 100644
--- a/framework-crates/objc2-symbols/src/lib.rs
+++ b/framework-crates/objc2-symbols/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/symbols/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-symbols/0.3.1")]
diff --git a/framework-crates/objc2-system-configuration/Cargo.toml b/framework-crates/objc2-system-configuration/Cargo.toml
index a5a85a72f..f9f022879 100644
--- a/framework-crates/objc2-system-configuration/Cargo.toml
+++ b/framework-crates/objc2-system-configuration/Cargo.toml
@@ -70,6 +70,7 @@ objc2 = [
     "objc2-security?/objc2",
 ]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 CaptiveNetwork = [
     "objc2-core-foundation/CFArray",
diff --git a/framework-crates/objc2-system-configuration/src/lib.rs b/framework-crates/objc2-system-configuration/src/lib.rs
index 38107022e..071efb694 100644
--- a/framework-crates/objc2-system-configuration/src/lib.rs
+++ b/framework-crates/objc2-system-configuration/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/systemconfiguration/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-system-configuration/0.3.1")]
diff --git a/framework-crates/objc2-system-extensions/Cargo.toml b/framework-crates/objc2-system-extensions/Cargo.toml
index 55256e19d..4c305a705 100644
--- a/framework-crates/objc2-system-extensions/Cargo.toml
+++ b/framework-crates/objc2-system-extensions/Cargo.toml
@@ -46,3 +46,4 @@ default = [
 std = ["alloc"]
 alloc = []
 dispatch2 = ["dep:dispatch2"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-system-extensions/src/lib.rs b/framework-crates/objc2-system-extensions/src/lib.rs
index 5ebd58f2e..9bc3f7a80 100644
--- a/framework-crates/objc2-system-extensions/src/lib.rs
+++ b/framework-crates/objc2-system-extensions/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/systemextensions/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-system-extensions/0.3.1")]
diff --git a/framework-crates/objc2-thread-network/Cargo.toml b/framework-crates/objc2-thread-network/Cargo.toml
index c43b14cfc..41550f170 100644
--- a/framework-crates/objc2-thread-network/Cargo.toml
+++ b/framework-crates/objc2-thread-network/Cargo.toml
@@ -41,6 +41,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 THClient = [
     "objc2-foundation/NSData",
diff --git a/framework-crates/objc2-thread-network/src/lib.rs b/framework-crates/objc2-thread-network/src/lib.rs
index cd47371cd..85008ab99 100644
--- a/framework-crates/objc2-thread-network/src/lib.rs
+++ b/framework-crates/objc2-thread-network/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/threadnetwork/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-thread-network/0.3.1")]
diff --git a/framework-crates/objc2-tv-ml-kit/Cargo.toml b/framework-crates/objc2-tv-ml-kit/Cargo.toml
index 866769333..67750d473 100644
--- a/framework-crates/objc2-tv-ml-kit/Cargo.toml
+++ b/framework-crates/objc2-tv-ml-kit/Cargo.toml
@@ -84,6 +84,7 @@ objc2-av-foundation = ["dep:objc2-av-foundation"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-javascript-core = ["dep:objc2-javascript-core"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 TVApplicationController = [
     "objc2-foundation/NSDictionary",
diff --git a/framework-crates/objc2-tv-ml-kit/src/lib.rs b/framework-crates/objc2-tv-ml-kit/src/lib.rs
index 7f76f07cb..8e913bc5b 100644
--- a/framework-crates/objc2-tv-ml-kit/src/lib.rs
+++ b/framework-crates/objc2-tv-ml-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/tvmlkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-tv-ml-kit/0.3.1")]
diff --git a/framework-crates/objc2-tv-services/Cargo.toml b/framework-crates/objc2-tv-services/Cargo.toml
index b3222e831..917c7b1d7 100644
--- a/framework-crates/objc2-tv-services/Cargo.toml
+++ b/framework-crates/objc2-tv-services/Cargo.toml
@@ -67,6 +67,7 @@ TVTopShelfItemCollection = [
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
+unstable-darwin-objc = []
 
 NSUserActivity_TVServices = ["objc2-foundation/NSString"]
 TVAppProfileDescriptor = [
diff --git a/framework-crates/objc2-tv-services/src/lib.rs b/framework-crates/objc2-tv-services/src/lib.rs
index 55724a8f3..65388b3e5 100644
--- a/framework-crates/objc2-tv-services/src/lib.rs
+++ b/framework-crates/objc2-tv-services/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/tvservices/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-tv-services/0.3.1")]
diff --git a/framework-crates/objc2-tv-ui-kit/Cargo.toml b/framework-crates/objc2-tv-ui-kit/Cargo.toml
index 28fa148f6..04412d58b 100644
--- a/framework-crates/objc2-tv-ui-kit/Cargo.toml
+++ b/framework-crates/objc2-tv-ui-kit/Cargo.toml
@@ -57,6 +57,7 @@ alloc = []
 block2 = ["dep:block2"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-quartz-core = ["dep:objc2-quartz-core"]
+unstable-darwin-objc = []
 
 TVCaptionButtonView = [
     "objc2-foundation/NSCoder",
diff --git a/framework-crates/objc2-tv-ui-kit/src/lib.rs b/framework-crates/objc2-tv-ui-kit/src/lib.rs
index e9794b7e4..9773f461a 100644
--- a/framework-crates/objc2-tv-ui-kit/src/lib.rs
+++ b/framework-crates/objc2-tv-ui-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/tvuikit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-tv-ui-kit/0.3.1")]
diff --git a/framework-crates/objc2-ui-kit/Cargo.toml b/framework-crates/objc2-ui-kit/Cargo.toml
index 31030ade2..a65517883 100644
--- a/framework-crates/objc2-ui-kit/Cargo.toml
+++ b/framework-crates/objc2-ui-kit/Cargo.toml
@@ -566,6 +566,7 @@ objc2-quartz-core = ["dep:objc2-quartz-core"]
 objc2-symbols = ["dep:objc2-symbols"]
 objc2-uniform-type-identifiers = ["dep:objc2-uniform-type-identifiers"]
 objc2-user-notifications = ["dep:objc2-user-notifications"]
+unstable-darwin-objc = []
 
 DocumentManager = []
 NSAdaptiveImageGlyph = [
diff --git a/framework-crates/objc2-ui-kit/src/lib.rs b/framework-crates/objc2-ui-kit/src/lib.rs
index 28947b2fc..97c626fc3 100644
--- a/framework-crates/objc2-ui-kit/src/lib.rs
+++ b/framework-crates/objc2-ui-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/uikit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-ui-kit/0.3.1")]
diff --git a/framework-crates/objc2-uniform-type-identifiers/Cargo.toml b/framework-crates/objc2-uniform-type-identifiers/Cargo.toml
index 7263d6f3d..4a819c05e 100644
--- a/framework-crates/objc2-uniform-type-identifiers/Cargo.toml
+++ b/framework-crates/objc2-uniform-type-identifiers/Cargo.toml
@@ -47,6 +47,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 NSItemProvider_UTType = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-uniform-type-identifiers/src/lib.rs b/framework-crates/objc2-uniform-type-identifiers/src/lib.rs
index 845c2bd29..e0c16dcf9 100644
--- a/framework-crates/objc2-uniform-type-identifiers/src/lib.rs
+++ b/framework-crates/objc2-uniform-type-identifiers/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/uniformtypeidentifiers/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-uniform-type-identifiers/0.3.1")]
diff --git a/framework-crates/objc2-user-notifications-ui/Cargo.toml b/framework-crates/objc2-user-notifications-ui/Cargo.toml
index 4ea71a723..bf00d4988 100644
--- a/framework-crates/objc2-user-notifications-ui/Cargo.toml
+++ b/framework-crates/objc2-user-notifications-ui/Cargo.toml
@@ -58,6 +58,7 @@ block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-user-notifications = ["dep:objc2-user-notifications"]
+unstable-darwin-objc = []
 
 UNNotificationContentExtension = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-user-notifications-ui/src/lib.rs b/framework-crates/objc2-user-notifications-ui/src/lib.rs
index a26733920..683268bda 100644
--- a/framework-crates/objc2-user-notifications-ui/src/lib.rs
+++ b/framework-crates/objc2-user-notifications-ui/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/usernotificationsui/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-user-notifications-ui/0.3.1")]
diff --git a/framework-crates/objc2-user-notifications/Cargo.toml b/framework-crates/objc2-user-notifications/Cargo.toml
index 670479318..2b511a77a 100644
--- a/framework-crates/objc2-user-notifications/Cargo.toml
+++ b/framework-crates/objc2-user-notifications/Cargo.toml
@@ -63,6 +63,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-core-location = ["dep:objc2-core-location"]
+unstable-darwin-objc = []
 
 NSString_UserNotifications = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-user-notifications/src/lib.rs b/framework-crates/objc2-user-notifications/src/lib.rs
index a473d9d6a..c8b231ac0 100644
--- a/framework-crates/objc2-user-notifications/src/lib.rs
+++ b/framework-crates/objc2-user-notifications/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/usernotifications/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-user-notifications/0.3.1")]
diff --git a/framework-crates/objc2-video-subscriber-account/Cargo.toml b/framework-crates/objc2-video-subscriber-account/Cargo.toml
index ddeae3c88..f215d05f9 100644
--- a/framework-crates/objc2-video-subscriber-account/Cargo.toml
+++ b/framework-crates/objc2-video-subscriber-account/Cargo.toml
@@ -63,6 +63,7 @@ alloc = []
 bitflags = ["dep:bitflags"]
 block2 = ["dep:block2"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
+unstable-darwin-objc = []
 
 VSAccountApplicationProvider = ["objc2-foundation/NSString"]
 VSAccountManager = [
diff --git a/framework-crates/objc2-video-subscriber-account/src/lib.rs b/framework-crates/objc2-video-subscriber-account/src/lib.rs
index 90755c644..c4aac6b71 100644
--- a/framework-crates/objc2-video-subscriber-account/src/lib.rs
+++ b/framework-crates/objc2-video-subscriber-account/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/videosubscriberaccount/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-video-subscriber-account/0.3.1")]
diff --git a/framework-crates/objc2-video-toolbox/Cargo.toml b/framework-crates/objc2-video-toolbox/Cargo.toml
index 4286fbed4..6c0785510 100644
--- a/framework-crates/objc2-video-toolbox/Cargo.toml
+++ b/framework-crates/objc2-video-toolbox/Cargo.toml
@@ -119,6 +119,7 @@ objc2-core-media = ["dep:objc2-core-media"]
 objc2-core-video = ["dep:objc2-core-video"]
 objc2-foundation = ["dep:objc2-foundation"]
 objc2-metal = ["dep:objc2-metal"]
+unstable-darwin-objc = []
 
 VTBase = []
 VTCompressionProperties = []
diff --git a/framework-crates/objc2-video-toolbox/src/lib.rs b/framework-crates/objc2-video-toolbox/src/lib.rs
index fec02251e..d0fe559fc 100644
--- a/framework-crates/objc2-video-toolbox/src/lib.rs
+++ b/framework-crates/objc2-video-toolbox/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/videotoolbox/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-video-toolbox/0.3.1")]
diff --git a/framework-crates/objc2-virtualization/Cargo.toml b/framework-crates/objc2-virtualization/Cargo.toml
index 5984f1ec3..7a3b7b260 100644
--- a/framework-crates/objc2-virtualization/Cargo.toml
+++ b/framework-crates/objc2-virtualization/Cargo.toml
@@ -179,6 +179,7 @@ block2 = ["dep:block2"]
 dispatch2 = ["dep:dispatch2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
+unstable-darwin-objc = []
 
 VZAudioDeviceConfiguration = ["objc2-foundation/NSObject"]
 VZAudioInputStreamSource = []
diff --git a/framework-crates/objc2-virtualization/src/lib.rs b/framework-crates/objc2-virtualization/src/lib.rs
index 3e42203d5..328b24eef 100644
--- a/framework-crates/objc2-virtualization/src/lib.rs
+++ b/framework-crates/objc2-virtualization/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/virtualization/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-virtualization/0.3.1")]
diff --git a/framework-crates/objc2-vision/Cargo.toml b/framework-crates/objc2-vision/Cargo.toml
index a622d6b72..f972f6ee5 100644
--- a/framework-crates/objc2-vision/Cargo.toml
+++ b/framework-crates/objc2-vision/Cargo.toml
@@ -159,6 +159,7 @@ objc2-core-media = ["dep:objc2-core-media"]
 objc2-core-ml = ["dep:objc2-core-ml"]
 objc2-core-video = ["dep:objc2-core-video"]
 objc2-image-io = ["dep:objc2-image-io"]
+unstable-darwin-objc = []
 
 VNCalculateImageAestheticsScoresRequest = [
     "objc2-foundation/NSArray",
diff --git a/framework-crates/objc2-vision/src/lib.rs b/framework-crates/objc2-vision/src/lib.rs
index 5dac625aa..6ec486b12 100644
--- a/framework-crates/objc2-vision/src/lib.rs
+++ b/framework-crates/objc2-vision/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/vision/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-vision/0.3.1")]
diff --git a/framework-crates/objc2-watch-connectivity/Cargo.toml b/framework-crates/objc2-watch-connectivity/Cargo.toml
index f6d4efc85..a0d1aa9f6 100644
--- a/framework-crates/objc2-watch-connectivity/Cargo.toml
+++ b/framework-crates/objc2-watch-connectivity/Cargo.toml
@@ -44,6 +44,7 @@ default = [
 std = ["alloc"]
 alloc = []
 block2 = ["dep:block2"]
+unstable-darwin-objc = []
 
 WCDefines = []
 WCError = ["objc2-foundation/NSString"]
diff --git a/framework-crates/objc2-watch-connectivity/src/lib.rs b/framework-crates/objc2-watch-connectivity/src/lib.rs
index a1da58d79..d1f8e2ad2 100644
--- a/framework-crates/objc2-watch-connectivity/src/lib.rs
+++ b/framework-crates/objc2-watch-connectivity/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/watchconnectivity/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-watch-connectivity/0.3.1")]
diff --git a/framework-crates/objc2-watch-kit/Cargo.toml b/framework-crates/objc2-watch-kit/Cargo.toml
index 382d28ba0..324e34493 100644
--- a/framework-crates/objc2-watch-kit/Cargo.toml
+++ b/framework-crates/objc2-watch-kit/Cargo.toml
@@ -134,6 +134,7 @@ objc2-map-kit = ["dep:objc2-map-kit"]
 objc2-scene-kit = ["dep:objc2-scene-kit"]
 objc2-ui-kit = ["dep:objc2-ui-kit"]
 objc2-user-notifications = ["dep:objc2-user-notifications"]
+unstable-darwin-objc = []
 
 WKAccessibility = ["objc2-foundation/NSString"]
 WKAlertAction = ["objc2-foundation/NSString"]
diff --git a/framework-crates/objc2-watch-kit/src/lib.rs b/framework-crates/objc2-watch-kit/src/lib.rs
index d778458b4..502844ded 100644
--- a/framework-crates/objc2-watch-kit/src/lib.rs
+++ b/framework-crates/objc2-watch-kit/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/watchkit/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-watch-kit/0.3.1")]
diff --git a/framework-crates/objc2-web-kit/Cargo.toml b/framework-crates/objc2-web-kit/Cargo.toml
index c2995f078..0ee327431 100644
--- a/framework-crates/objc2-web-kit/Cargo.toml
+++ b/framework-crates/objc2-web-kit/Cargo.toml
@@ -302,6 +302,7 @@ objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-javascript-core = ["dep:objc2-javascript-core"]
 objc2-security = ["dep:objc2-security"]
+unstable-darwin-objc = []
 
 DOM = []
 DOMAbstractView = ["objc2-foundation/NSObject"]
diff --git a/framework-crates/objc2-web-kit/src/lib.rs b/framework-crates/objc2-web-kit/src/lib.rs
index 681f3c824..02f002654 100644
--- a/framework-crates/objc2-web-kit/src/lib.rs
+++ b/framework-crates/objc2-web-kit/src/lib.rs
@@ -7,6 +7,7 @@
 #![recursion_limit = "512"]
 #![allow(non_snake_case)]
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-web-kit/0.3.1")]
diff --git a/framework-crates/objc2-xc-test/Cargo.toml b/framework-crates/objc2-xc-test/Cargo.toml
index e91903fdb..d5007a622 100644
--- a/framework-crates/objc2-xc-test/Cargo.toml
+++ b/framework-crates/objc2-xc-test/Cargo.toml
@@ -71,3 +71,4 @@ alloc = []
 block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-xc-ui-automation = ["dep:objc2-xc-ui-automation"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-xc-test/src/lib.rs b/framework-crates/objc2-xc-test/src/lib.rs
index b4b63c38c..898978522 100644
--- a/framework-crates/objc2-xc-test/src/lib.rs
+++ b/framework-crates/objc2-xc-test/src/lib.rs
@@ -18,6 +18,7 @@
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 //! [examples-testing]: https://github.com/madsmtm/objc2/tree/main/examples/testing-helper
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-xc-test/0.3.1")]
diff --git a/framework-crates/objc2-xc-ui-automation/Cargo.toml b/framework-crates/objc2-xc-ui-automation/Cargo.toml
index 6481e37a4..b3f692232 100644
--- a/framework-crates/objc2-xc-ui-automation/Cargo.toml
+++ b/framework-crates/objc2-xc-ui-automation/Cargo.toml
@@ -67,3 +67,4 @@ block2 = ["dep:block2"]
 objc2-app-kit = ["dep:objc2-app-kit"]
 objc2-core-foundation = ["dep:objc2-core-foundation"]
 objc2-core-location = ["dep:objc2-core-location"]
+unstable-darwin-objc = []
diff --git a/framework-crates/objc2-xc-ui-automation/src/lib.rs b/framework-crates/objc2-xc-ui-automation/src/lib.rs
index 27ea67711..b80f8307f 100644
--- a/framework-crates/objc2-xc-ui-automation/src/lib.rs
+++ b/framework-crates/objc2-xc-ui-automation/src/lib.rs
@@ -5,6 +5,7 @@
 //! [apple-doc]: https://developer.apple.com/documentation/xcuiautomation/
 //! [framework-crates]: https://docs.rs/objc2/latest/objc2/topics/about_generated/index.html
 #![no_std]
+#![cfg_attr(feature = "unstable-darwin-objc", feature(darwin_objc))]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2-xc-ui-automation/0.3.1")]