1 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/universal-two-impl-traits.rs b/src/test/ui/impl-trait/universal-two-impl-traits.rs
new file mode 100644
index 00000000000..9a4847b5606
--- /dev/null
+++ b/src/test/ui/impl-trait/universal-two-impl-traits.rs
@@ -0,0 +1,21 @@
+// Copyright 2017 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.
+
+#![feature(universal_impl_trait)]
+
+use std::fmt::Debug;
+
+fn foo(x: impl Debug, y: impl Debug) -> String {
+    let mut a = x;
+    a = y; //~ ERROR mismatched
+    format!("{:?}", a)
+}
+
+fn main() { }