Add regression test for nested macros

Add a new test to avoid regression on newly added changes about macros
expanding to new macro definitions.

gcc/testsuite/ChangeLog:

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

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

1 files changed, 16 insertions, 0 deletions

diff --git a/gcc/testsuite/rust/compile/nested_macro_definition.rs b/gcc/testsuite/rust/compile/nested_macro_definition.rs
new file mode 100644
index 0000000..c0b7250
--- /dev/null
+++ b/gcc/testsuite/rust/compile/nested_macro_definition.rs
@@ -0,0 +1,16 @@
+// { dg-options "-frust-name-resolution-2.0" }
+
+macro_rules! toto {
+    () => {
+        macro_rules! tata {
+            () => {
+                let _i = 0;
+            };
+        }
+    };
+}
+
+pub fn main() {
+    toto!();
+    tata!();
+}