tree 2e4561ba7cbd8ddeea70ea958144c695acdbf313
parent 9545094994f1ab45cab5799d5b45980871a9e97b
author Matthias Krüger <matthias.krueger@famsik.de> 1675513673 +0100
committer Matthias Krüger <matthias.krueger@famsik.de> 1675514174 +0100

don't point at nonexisting code beyond EOF when warning about unused delims

Previously we would show this:
```
warning: unnecessary braces around block return value
 --> /tmp/bad.rs:1:8
  |
1 | fn a(){{{
  |        ^  ^
  |
  = note: `#[warn(unused_braces)]` on by default
help: remove these braces
  |
1 - fn a(){{{
1 + fn a(){{
  |
```

which is now hidden in this case.
We would create a span spanning between the pair of redundant {}s but there is only EOF instead of the `}` so we would previously point at nothing.
This would cause the debug assertion ice to trigger.
I would have loved to just only point at the second delim and say "you can remove that" but I'm not sure how to do that without refactoring the entire diagnostic which seems tricky. :(
But given that this does not seem to regress any other tests we have, I think this edge-casey enough be acceptable.

Fixes https://github.com/rust-lang/rust/issues/107423

r? @compiler-errors