Regression test for #19982

Closes #17165, #19982.

Author: tamird

src/test/compile-fail/issue-19982.rs

@@ -0,0 +1,17 @@
+// 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.
+
+#![feature(unboxed_closures)]
+
+struct Foo;
+
+impl Fn<(&(),)> for Foo { } //~ ERROR missing lifetime specifier
+
+fn main() {}

src/test/run-pass/issue-19982.rs

@@ -0,0 +1,22 @@
+// 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.
+
+#![feature(core,unboxed_closures)]
+
+#[allow(dead_code)]
+struct Foo;
+
+impl<'a> Fn<(&'a (),)> for Foo {
+    type Output = ();
+
+    extern "rust-call" fn call(&self, (_,): (&(),)) {}
+}
+
+fn main() {}