1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/imports/extern-prelude-extern-crate-restricted-shadowing.rs b/src/test/ui/imports/extern-prelude-extern-crate-restricted-shadowing.rs
new file mode 100644
index 000000000..6ff3ab736
--- /dev/null
+++ b/src/test/ui/imports/extern-prelude-extern-crate-restricted-shadowing.rs
@@ -0,0 +1,26 @@
+// aux-build:two_macros.rs
+
+macro_rules! define_vec {
+    () => {
+        extern crate std as Vec;
+    }
+}
+
+define_vec!();
+
+mod m {
+    fn check() {
+        Vec::panic!(); //~ ERROR `Vec` is ambiguous
+    }
+}
+
+macro_rules! define_other_core {
+    () => {
+        extern crate std as core;
+        //~^ ERROR macro-expanded `extern crate` items cannot shadow names passed with `--extern`
+    }
+}
+
+define_other_core!();
+
+fn main() {}