auto merge of #14350 : zwarich/rust/let-suggestion, r=pcwalton

src/test/compile-fail/borrowck-let-suggestion.rs

@@ -0,0 +1,20 @@
+// Copyright 2014 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.
+
+fn f() {
+    let x = [1].iter(); //~ ERROR borrowed value does not live long enough
+                        //~^^ NOTE reference must be valid for the block
+                        //~^^ NOTE consider using a `let` binding to increase its lifetime
+}
+
+fn main() {
+    f();
+}
+