1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/ui/specialization-feature-gate-default.rs b/src/test/ui/specialization-feature-gate-default.rs
new file mode 100644
index 00000000000..3a01ecdf9db
--- /dev/null
+++ b/src/test/ui/specialization-feature-gate-default.rs
@@ -0,0 +1,23 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Check that specialization must be ungated to use the `default` keyword
+
+// gate-test-specialization
+
+trait Foo {
+    fn foo(&self);
+}
+
+impl<T> Foo for T {
+    default fn foo(&self) {} //~ ERROR specialization is unstable
+}
+
+fn main() {}