1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/hygiene/cross-crate-redefine.rs b/src/test/ui/hygiene/cross-crate-redefine.rs
new file mode 100644
index 000000000..3cb06b4ba
--- /dev/null
+++ b/src/test/ui/hygiene/cross-crate-redefine.rs
@@ -0,0 +1,14 @@
+// Check that items with identical `SyntaxContext` conflict even when that
+// context involves a mark from another crate.
+
+// aux-build:use_by_macro.rs
+
+extern crate use_by_macro;
+
+use use_by_macro::*;
+
+my_struct!(define);
+//~^ ERROR the name `MyStruct` is defined multiple times
+my_struct!(define);
+
+fn main() {}