Fix incorrect span label formatting

src/test/ui/span/issue-40157.rs

@@ -0,0 +1,13 @@
+// Copyright 2017 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 main () {
+    {println!("{:?}", match { let foo = vec![1, 2]; foo.get(1) } { x => x });}
+}

src/test/ui/span/issue-40157.stderr

@@ -0,0 +1,14 @@
+error: `foo` does not live long enough
+  --> $DIR/issue-40157.rs:12:64
+   |
+12 |     {println!("{:?}", match { let foo = vec![1, 2]; foo.get(1) } { x => x });}
+   |      ----------------------------------------------------------^-------------
+   |      |                                              |          |
+   |      |                                              |          `foo` dropped here while still borrowed
+   |      |                                              borrow occurs here
+   |      borrowed value needs to live until here
+   |
+   = note: this error originates in a macro outside of the current crate
+
+error: aborting due to previous error
+