`format!` error has wrong span when using encoded `{`

[Nemo157]

I tried this code:

format!("\x7Ba}")

I expected to see this happen: a "no value found" error pointing at the a token

Instead, this happened: a "no value found" error pointing at the x7Ba:

error[E0425]: cannot find value `a` in this scope
 --> src/main.rs:2:11
  |
2 | format!("\x7Ba}")
  |           ^^^^ not found in this scope

[cassaundra]

This doesn't seem to be an issue on stable, interestingly.

[Nemo157]

Yep, it works fine on 1.63.0, but has the problem on 1.65.0-beta.1 and the latest nightly.

[cassaundra]

@rustbot claim