--- /dev/null
+error: unsatisfied lifetime constraints
+ --> $DIR/issue-49824.rs:22:9
+ |
+LL | || {
+ | _____-
+ | |_____|
+ | ||
+LL | || || {
+ | ||_________^
+LL | ||| let _y = &mut x;
+LL | ||| }
+ | |||_________^ requires that `'1` must outlive `'2`
+LL | || };
+ | || -
+ | ||_____|
+ | |______lifetime `'1` represents the closure body
+ | lifetime `'2` appears in return type
+
+error: aborting due to previous error
+
--- /dev/null
+// 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.
+
+#![feature(rustc_attrs)]
+
+// This test checks that a failure occurs with NLL but does not fail with the
+// legacy AST output. Check issue-49824.nll.stderr for expected compilation error
+// output under NLL and #49824 for more information.
+
+#[rustc_error]
+fn main() {
+ //~^ compilation successful
+ let mut x = 0;
+ || {
+ || {
+ let _y = &mut x;
+ }
+ };
+}
--- /dev/null
+error: compilation successful
+ --> $DIR/issue-49824.rs:18:1
+ |
+LL | / fn main() {
+LL | | //~^ compilation successful
+LL | | let mut x = 0;
+LL | | || {
+... |
+LL | | };
+LL | | }
+ | |_^
+
+error: aborting due to previous error
+