gccrs: Fix expansion of macros inside modules

gcc/rust/ChangeLog:

	* expand/rust-expand-visitor.cc
	(ExpandVisitor::visit): Override DefaultASTVisitor in order to
	expand a module's items, rather than directly visit them.
	* expand/rust-expand-visitor.h
	(ExpandVisitor::visit): Add override.

gcc/testsuite/ChangeLog:

	* rust/compile/macros/mbe/macro-expand-module.rs: New test.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

3 files changed, 18 insertions, 0 deletions

diff --git a/gcc/rust/expand/rust-expand-visitor.cc b/gcc/rust/expand/rust-expand-visitor.cc
index 8ba9a15..2830d20 100644
--- a/gcc/rust/expand/rust-expand-visitor.cc
+++ b/gcc/rust/expand/rust-expand-visitor.cc
@@ -722,6 +722,12 @@ ExpandVisitor::visit (AST::TypeBoundWhereClauseItem &item)
 }
 
 void
+ExpandVisitor::visit (AST::Module &module)
+{
+  expand_inner_items (module.get_items ());
+}
+
+void
 ExpandVisitor::visit (AST::ExternCrate &crate)
 {}
 
diff --git a/gcc/rust/expand/rust-expand-visitor.h b/gcc/rust/expand/rust-expand-visitor.h
index 5fc1011e..ad237c0 100644
--- a/gcc/rust/expand/rust-expand-visitor.h
+++ b/gcc/rust/expand/rust-expand-visitor.h
@@ -237,6 +237,7 @@ public:
   void visit (AST::TypeParam &param) override;
   void visit (AST::LifetimeWhereClauseItem &) override;
   void visit (AST::TypeBoundWhereClauseItem &item) override;
+  void visit (AST::Module &module) override;
   void visit (AST::ExternCrate &crate) override;
   void visit (AST::UseTreeGlob &) override;
   void visit (AST::UseTreeList &) override;
diff --git a/gcc/testsuite/rust/compile/macros/mbe/macro-expand-module.rs b/gcc/testsuite/rust/compile/macros/mbe/macro-expand-module.rs
new file mode 100644
index 0000000..e3e702e
--- /dev/null
+++ b/gcc/testsuite/rust/compile/macros/mbe/macro-expand-module.rs
@@ -0,0 +1,11 @@
+mod foo {
+    macro_rules! bar {
+        () => ()
+    }
+
+    bar! ();
+
+    pub struct S;
+}
+
+pub fn buzz(_: foo::S) {}