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rust/compiler/rustc_incremental
Stuart Cook ee64422ffa Rollup merge of #154110 - lambdageek:fix/incr-compile-note, r=wesleywiser
Change "error finalizing incremental compilation" text and emit it as a note, not a warning

As mentioned in https://github.com/rust-lang/rust/issues/151181#issuecomment-3762036971 and https://github.com/rust-lang/rust/issues/151181#issuecomment-4068842260 the current message could be improved:

1. Right now it displays as "warning: error ..." which is confusing (is it an error or a warning)
2. It doesn't give the user a clear indication of what the consequences are
3. The _current_ build is successful. The _next_ build might be slower

The new message is now

```text
note: did not finalize incremental compilation session directory ...
  |
  = help: the next build will not be able to reuse work from this compilation
```

I started a zulip thread [#t-compiler/incremental > Ergonomics of "error finalizing incremental session"](https://rust-lang.zulipchat.com/#narrow/channel/241847-t-compiler.2Fincremental/topic/Ergonomics.20of.20.22error.20finalizing.20incremental.20session.22/with/580191447)
2026-03-28 15:01:38 +11:00
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