Add regression test for issue rust-lang#48697

rust-lang#48697

src/test/ui/nll/issue-48697.rs

@@ -0,0 +1,24 @@
+// Copyright 2018 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.
+
+// Regression test for #48697
+
+// compile-pass
+
+#![feature(nll)]
+
+fn foo(x: &i32) -> &i32 {
+    let z = 4;
+    let f = &|y| y;
+    let k = f(&z);
+    f(x)
+}
+
+fn main() {}