Fix warning on current rustc versions

Author: bjorn3

src/tests/mod.rs

@@ -50,9 +50,9 @@ fn test_reqopt() {
     let short_args = vec!["-t".to_string(), "20".to_string()];
     match opts.parse(&short_args) {
         Ok(ref m) => {
-            assert!((m.opt_present("test")));
+            assert!(m.opt_present("test"));
             assert_eq!(m.opt_str("test").unwrap(), "20");
-            assert!((m.opt_present("t")));
+            assert!(m.opt_present("t"));
             assert_eq!(m.opt_str("t").unwrap(), "20");
         }
         _ => {
@@ -111,17 +111,17 @@ fn test_optopt() {
         Ok(ref m) => {
             assert!(m.opt_present("test"));
             assert_eq!(m.opt_str("test").unwrap(), "20");
-            assert!((m.opt_present("t")));
+            assert!(m.opt_present("t"));
             assert_eq!(m.opt_str("t").unwrap(), "20");
         }
         _ => panic!(),
     }
     let short_args = vec!["-t".to_string(), "20".to_string()];
     match opts.parse(&short_args) {
         Ok(ref m) => {
-            assert!((m.opt_present("test")));
+            assert!(m.opt_present("test"));
             assert_eq!(m.opt_str("test").unwrap(), "20");
-            assert!((m.opt_present("t")));
+            assert!(m.opt_present("t"));
             assert_eq!(m.opt_str("t").unwrap(), "20");
         }
         _ => panic!(),
@@ -443,19 +443,19 @@ fn test_optmulti() {
     opts.optmulti("t", "test", "testing", "TEST");
     match opts.parse(&long_args) {
         Ok(ref m) => {
-            assert!((m.opt_present("test")));
+            assert!(m.opt_present("test"));
             assert_eq!(m.opt_str("test").unwrap(), "20");
-            assert!((m.opt_present("t")));
+            assert!(m.opt_present("t"));
             assert_eq!(m.opt_str("t").unwrap(), "20");
         }
         _ => panic!(),
     }
     let short_args = vec!["-t".to_string(), "20".to_string()];
     match opts.parse(&short_args) {
         Ok(ref m) => {
-            assert!((m.opt_present("test")));
+            assert!(m.opt_present("test"));
             assert_eq!(m.opt_str("test").unwrap(), "20");
-            assert!((m.opt_present("t")));
+            assert!(m.opt_present("t"));
             assert_eq!(m.opt_str("t").unwrap(), "20");
         }
         _ => panic!(),
@@ -576,16 +576,16 @@ fn test_combined() {
             assert!(m.free[1] == "free1");
             assert_eq!(m.opt_str("s").unwrap(), "20");
             assert!(m.free[2] == "free2");
-            assert!((m.opt_present("flag")));
+            assert!(m.opt_present("flag"));
             assert_eq!(m.opt_str("long").unwrap(), "30");
-            assert!((m.opt_present("f")));
+            assert!(m.opt_present("f"));
             let pair = m.opt_strs("m");
             assert!(pair[0] == "40");
             assert!(pair[1] == "50");
             let pair = m.opt_strs("n");
             assert!(pair[0] == "-A B");
             assert!(pair[1] == "-60 70");
-            assert!((!m.opt_present("notpresent")));
+            assert!(!m.opt_present("notpresent"));
         }
         _ => panic!(),
     }