Test case for mains defined in trait

build.sc

@@ -8,7 +8,7 @@ import com.github.lolgab.mill.mima._
 
 val scala212 = "2.12.17"
 val scala213 = "2.13.10"
-val scala3 = "3.1.3"
+val scala3 = "3.3.1"
 
 val osLib = "0.9.1"
 val acyclic = "0.3.9"

mainargs/test/src/TraitTests.scala

@@ -0,0 +1,26 @@
+package mainargs
+import utest._
+
+object TraitTests extends TestSuite {
+
+  trait CommandList {
+    @main
+    def list(@arg v: String) = v
+  }
+
+  trait CommandCopy {
+    @main
+    def copy(@arg from: String, @arg to: String) = (from, to)
+  }
+
+  object Main extends CommandList with CommandCopy {
+    def main(args: Array[String]): Unit = ParserForMethods(this).runOrExit(args)
+  }
+
+  val tests = Tests {
+    test("explicit") {
+      ParserForMethods(Main).runOrThrow(Array("list", "-v", "hello")) ==> "hello"
+      ParserForMethods(Main).runOrThrow(Array("copy", "--from", "hello", "--to", "world")) ==> ("hello", "world")
+    }
+  }
+}