Test not never

Currently fails to build:

    error[E0600]: cannot apply unary operator `!` to type `!`
       --> library/core/tests/ops.rs:239:8
        |
    239 |     if !return () {}
        |        ^^^^^^^^^^ cannot apply unary operator `!`

Author: dtolnay

library/core/tests/ops.rs

@@ -232,3 +232,9 @@ fn deref_on_ref() {
     let y = deref(&mut x);
     assert_eq!(y, 4);
 }
+
+#[test]
+#[allow(unreachable_code)]
+fn test_not_never() {
+    if !return () {}
+}