1 files changed, 13 insertions, 0 deletions
diff --git a/src/test/ui/proc-macro/helper-attr-blocked-by-import-ambig.rs b/src/test/ui/proc-macro/helper-attr-blocked-by-import-ambig.rs
new file mode 100644
index 000000000..40c42d82f
--- /dev/null
+++ b/src/test/ui/proc-macro/helper-attr-blocked-by-import-ambig.rs
@@ -0,0 +1,13 @@
+// aux-build:test-macros.rs
+
+#[macro_use(Empty)]
+extern crate test_macros;
+use test_macros::empty_attr as empty_helper;
+
+#[empty_helper] //~ ERROR `empty_helper` is ambiguous
+                //~| WARN derive helper attribute is used before it is introduced
+                //~| WARN this was previously accepted
+#[derive(Empty)]
+struct S;
+
+fn main() {}