Add regression test for issue #17758

Author: bkoropoff

src/test/compile-fail/issue-17758.rs

@@ -0,0 +1,22 @@
+// Copyright 2014 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.
+
+// Test that regionck suggestions in a provided method of a trait
+// don't ICE
+
+trait Foo<'a> {
+    fn foo(&'a self);
+    fn bar(&self) {
+        self.foo();
+        //~^ ERROR mismatched types: expected `&'a Self`, found `&Self` (lifetime mismatch)
+    }
+}
+
+fn main() {}