Fix assert! macro usage

There is a bug in rustc that allows adding invalid trailing tokens to
the `assert!` macro call. They are currently ignored but are going to
produce errors in the future.

Fix assert! macro usage to remove extra tokens.

For more information, see
rust-lang/rust#60024 and
rust-lang/rust#60039

Author: rasendubi

src/tests.rs

@@ -307,7 +307,7 @@ fn test_at() {
 		error = true;
 		assert_eq!(e, IndexOutOfBounds);
 	}
-	assert!(error;);
+	assert!(error);
 }
 
 #[test]