Add a new test for mbe named macro_rules

Macro rules named macro_rules may cause some problems if not handled
correctly. This new test ensure we always compile those macros named
macro_rules correctly as well as other macro definitions.

gcc/testsuite/ChangeLog:

	* rust/compile/macro57.rs: New test.

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

diff --git a/gcc/testsuite/rust/compile/macro57.rs b/gcc/testsuite/rust/compile/macro57.rs
new file mode 100644 (file)
index 0000000..0640d2f
--- /dev/null
+++ b/gcc/testsuite/rust/compile/macro57.rs
@@ -0,0 +1,13 @@
+macro_rules! macro_rules {
+    () => {};
+}
+
+macro_rules! foo {
+    () => {};
+}
+
+foo!();
+
+fn main() {}
+
+macro_rules!();