Auto merge of #35732 - jonathandturner:region_error_labels, r=nikomatsakis

Move 'doesn't live long enough' errors to labels

This patch moves the "doesn't live long enough" region-style errors to instead use labels.

An example follows.

Before:

```
error: `x` does not live long enough
  --> src/test/compile-fail/send-is-not-static-ensures-scoping.rs:26:18
   |
26 |         let y = &x;
   |                  ^
   |
note: reference must be valid for the block at 23:10...
  --> src/test/compile-fail/send-is-not-static-ensures-scoping.rs:23:11
   |
23 | fn main() {
   |           ^
note: ...but borrowed value is only valid for the block suffix following statement 0 at 25:18
  --> src/test/compile-fail/send-is-not-static-ensures-scoping.rs:25:19
   |
25 |         let x = 1;
   |                   ^
```

After:

```
error: `x` does not live long enough
  --> src/test/compile-fail/send-is-not-static-ensures-scoping.rs:26:18
   |
26 |         let y = &x;
   |                  ^ does not live long enough
...
32 |     };
   |     - borrowed value only valid until here
...
35 | }
   | - borrowed value must be valid until here
```

r? @nikomatsakis

0 files changed, 0 insertions, 0 deletions