add test for issue-48238

src/test/ui/nll/issue-48238.rs

@@ -0,0 +1,22 @@
+// 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 issue #48238
+
+#![feature(nll)]
+
+fn use_val<'a>(val: &'a u8) -> &'a u8 {
+    val
+}
+
+fn main() {
+    let orig: u8 = 5;
+    move || use_val(&orig); //~ ERROR free region `` does not outlive free region `'_#1r`
+}

src/test/ui/nll/issue-48238.stderr

@@ -0,0 +1,8 @@
+error: free region `` does not outlive free region `'_#1r`
+  --> $DIR/issue-48238.rs:21:21
+   |
+LL |     move || use_val(&orig); //~ ERROR free region `` does not outlive free region `'_#1r`
+   |                     ^^^^^
+
+error: aborting due to previous error
+