Add new regression test

This new test highlight the fix for #2651.

gcc/testsuite/ChangeLog:

	* rust/compile/macro_rules_macro_rules.rs: New test.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/gcc/testsuite/rust/compile/macro_rules_macro_rules.rs b/gcc/testsuite/rust/compile/macro_rules_macro_rules.rs
new file mode 100644
index 0000000..ecd1712
--- /dev/null
+++ b/gcc/testsuite/rust/compile/macro_rules_macro_rules.rs
@@ -0,0 +1,10 @@
+macro_rules! macro_rules {
+    () => {
+        struct S;
+    };
+}
+macro_rules! {} // calls the macro defined above
+
+fn main() {
+    let _s = S;
+}