[stable] Don't try to recover keyword as non-keyword identifier

[tgross35]

Backport #150590 to stable.

Zulip thread: https://rust-lang.zulipchat.com/#narrow/channel/474880-t-compiler.2Fbackports/topic/.23150590.3A.20stable-nominated/with/570208181

Cc author @jieyouxu.

[rustbot]

r? @jieyouxu

rustbot has assigned @jieyouxu.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[rust-log-analyzer]

A job failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

##[group]Runner Image Provisioner
Hosted Compute Agent
Version: 20260115.477
Commit: 4b342d620503cbe250a3154040964899ea7c9b00
Build Date: 2026-01-15T22:32:41Z
Worker ID: {b8761893-0596-4121-ba9a-7fbddda34362}
Azure Region: westcentralus
##[endgroup]
##[group]Operating System
Ubuntu
24.04.3
LTS

[mu001999]

I think we should also backport #151249

[tgross35]

@mu001999 could you elaborate on why at the backport stream? #t-compiler/backports > #150590: stable-nominated

[apiraino]

stable backport accepted during t-compiler triage, though we don't feel it deserve in isolation a dot release.

@rustbot label +stable-accepted

[jieyouxu]

(I'm going to close this in favor of a stable backport rollup that contains #150590, which is already tagged stable-accepted, since the stable backport will need to backport a clippy fix too I think)