From 252027960410da9f425cab9b6f6599af1d63800f Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Mon, 13 Nov 2017 13:26:27 -0500
Subject: [PATCH] test we reject equivalent signatures with more than one
 argument

---
 .../impl-trait/impl-generic-mismatch-ab.rs    | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 src/test/compile-fail/impl-trait/impl-generic-mismatch-ab.rs

diff --git a/src/test/compile-fail/impl-trait/impl-generic-mismatch-ab.rs b/src/test/compile-fail/impl-trait/impl-generic-mismatch-ab.rs
new file mode 100644
index 00000000000..43b47e9e915
--- /dev/null
+++ b/src/test/compile-fail/impl-trait/impl-generic-mismatch-ab.rs
@@ -0,0 +1,23 @@
+// 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;
+
+trait Foo {
+    fn foo<A: Debug>(&self, a: &A, b: &impl Debug);
+}
+
+impl Foo for () {
+    fn foo<B: Debug>(&self, a: &impl Debug, b: &B) { }
+    //~^ ERROR method `foo` has an incompatible type for trait
+}
+
+fn main() {}