Move /src/test to /tests

tests/ui/feature-gates/feature-gate-allow-internal-unsafe-nested-macro.rs

@@ -0,0 +1,17 @@
+// gate-test-allow_internal_unsafe
+
+#![allow(unused_macros)]
+
+macro_rules! bar {
+    () => {
+        // more layers don't help:
+        #[allow_internal_unsafe] //~ ERROR allow_internal_unsafe side-steps
+        macro_rules! baz {
+            () => {}
+        }
+    }
+}
+
+bar!();
+
+fn main() {}