This now uses `node_to_string` for both missing and seen Ids, which includes
the snippet of code for which the Id was allocated.
Also removes the duplicated printing of `HirId`, as `node_to_string` includes that already.
Similarly, changes all other users of `node_to_string` that do so, and changes the output of `node_to_string`, which is now "$hirid ($what `$span` in $path)".

…-field-pat, r=jackh726

Recover `_` as `..` in field pattern

…, r=estebank

Improve diagnostic for missing space in range pattern

Improves the diagnostic in rust-lang#107425 by turning it into a note explaining the parsing issue.

r? `@compiler-errors`

…errors

Improve pretty-printing of `HirIdValidator` errors

This now uses `node_to_string` for both missing and seen Ids, which includes the snippet of code for which the Id was allocated. Also removes the duplicated printing of `HirId`, as `node_to_string` also includes that.

Remove both StorageLive and StorageDead in CopyProp.

Fixes rust-lang#107511

rust-lang#106908 removed StorageDead without the accompanying StorageLive. In loops, execution would see repeated StorageLive, without any StorageDead, which is UB.

So when removing storage statements, we have to remove both StorageLive and StorageDead.

~I also added a MIR validation pass for StorageLive. It may be a bit overzealous.~

…ninhabited, r=jackh726

Erase regions before doing uninhabited check in borrowck

~Also, fingerprint query keys/values when debug assertions are enabled. This should make it easier to check for issues like this without `-Cincremental`, and make UI tests a bit cleaner.~ edit: moving that to a separate PR

Fixes rust-lang#107505

Rename `rust_2015` → `is_rust_2015`

r? ```@compiler-errors```
rust-lang#107508 (comment)

…=jyn514

Reinstate the `hir-stats.rs` tests on stage 1.

r? ```@the8472```