1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/macros/macro-shadowing.rs b/src/test/ui/macros/macro-shadowing.rs
new file mode 100644
index 000000000..7f956dd7d
--- /dev/null
+++ b/src/test/ui/macros/macro-shadowing.rs
@@ -0,0 +1,26 @@
+// aux-build:two_macros.rs
+
+#![allow(unused_macros)]
+
+macro_rules! foo { () => {} }
+macro_rules! macro_one { () => {} }
+#[macro_use(macro_two)] extern crate two_macros;
+
+macro_rules! m1 { () => {
+    macro_rules! foo { () => {} }
+
+    #[macro_use] //~ ERROR `macro_two` is already in scope
+    extern crate two_macros as __;
+}}
+m1!();
+
+foo!(); //~ ERROR `foo` is ambiguous
+
+macro_rules! m2 { () => {
+    macro_rules! foo { () => {} }
+    foo!();
+}}
+m2!();
+//^ Since `foo` is not used outside this expansion, it is not a shadowing error.
+
+fn main() {}