1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/ui/macros/duplicate-builtin.rs b/src/test/ui/macros/duplicate-builtin.rs
new file mode 100644
index 000000000..35f0f4290
--- /dev/null
+++ b/src/test/ui/macros/duplicate-builtin.rs
@@ -0,0 +1,17 @@
+// compile-flags:--crate-type lib
+#![feature(decl_macro)]
+#![feature(rustc_attrs)]
+
+#[rustc_builtin_macro]
+pub macro test($item:item) {
+//~^ NOTE previously defined
+    /* compiler built-in */
+}
+
+mod inner {
+    #[rustc_builtin_macro]
+    pub macro test($item:item) {
+    //~^ ERROR attempted to define built-in macro more than once [E0773]
+        /* compiler built-in */
+    }
+}