Auto merge of #39066 - arielb1:lifetime-extension-test, r=nikomatsakis

End temporary lifetimes being extended by `let X: &_` hints

cc #39283

r? @nikomatsakis

1 files changed, 27 insertions, 0 deletions

diff --git a/src/test/compile-fail/issue-36082.rs b/src/test/compile-fail/issue-36082.rs
new file mode 100644
index 00000000000..cec4b2d15dc
--- /dev/null
+++ b/src/test/compile-fail/issue-36082.rs
@@ -0,0 +1,27 @@
+// Copyright 2016 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.
+
+use std::cell::RefCell;
+
+fn main() {
+    let mut r = 0;
+    let s = 0;
+    let x = RefCell::new((&mut r,s));
+
+    let val: &_ = x.borrow().0;
+    //~^ WARNING this temporary used to live longer - see issue #39283
+    //~^^ ERROR borrowed value does not live long enough
+    //~| temporary value dropped here while still borrowed
+    //~| temporary value created here
+    //~| consider using a `let` binding to increase its lifetime
+    //~| before rustc 1.16, this temporary lived longer - see issue #39283
+    println!("{}", val);
+}
+//~^ temporary value needs to live until here