Add test for #33185

Closes #33185

src/test/run-pass/issue-33185.rs

@@ -0,0 +1,26 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(dead_code)]
+
+#[macro_export]
+macro_rules! state {
+    ( $( $name:ident : $field:ty )* ) => (
+        #[derive(Default)]
+        struct State {
+            $($name : $field),*
+        }
+    )
+}
+
+state! { x: i64 }
+
+pub fn main() {
+}