Always force non-trimming of path in `unreachable_patterns` lint #135310

estebank · 2025-01-09T23:13:17Z

Creating a "trimmed DefID path" when no error is being emitted is an ICE (on purpose). If we create a trimmed path for a lint that is then silenced before being emitted causes a known ICE. This side-steps the issue by always using with_no_trimmed_path!.

This was verified to fix https://github.com/quinn-rs/quinn/, but couldn't write a repro case for the test suite.

Fix #135289.

Creating a "trimmed DefID path" when no error is being emitted is an ICE (on purpose). If we create a trimmed path for a lint that is then silenced before being emitted causes a known ICE. This side-steps the issue by always using `with_no_trimmed_path!`. This was verified to fix https://github.com/quinn-rs/quinn/, but couldn't write a repro case for the test suite. Fix rust-lang#135289.

rustbot · 2025-01-09T23:13:25Z

r? @Nadrieril

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rustbot · 2025-01-09T23:13:27Z

Some changes occurred in match checking

cc @Nadrieril

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lqd · 2025-01-09T23:30:00Z

I had the same workaround locally, but still wondered where the lint was silenced for the unreachable arms in that crate 🤔.

estebank · 2025-01-09T23:41:59Z

@lqd my assumption it is because of cargo silencing the lint for deps, but it's only a guess.

lqd · 2025-01-10T00:03:24Z

Interesting possibility. They do that via --cap-lints=allow IIRC, so I would have expected this to allow unreachable patterns, that you check at the beginning of the typo const checking. But maybe they do so differently for this use-case via tests.

compiler-errors · 2025-01-10T01:41:15Z

Would be nice to have a test for this

Nadrieril · 2025-01-10T15:14:58Z

I don't get why a lint wasn't emitted, I too would really like a repro.

estebank · 2025-01-10T17:15:57Z

I identified it is happening at quinn-proto/src/tests/mod.rs:1640:9 and now I think it might be cross-crate macro shenanigans affecting the logic of lint emitting. I'll dig deeper.

Edit: If I don't find a more appropriate solution before then, we should beta-backport this change in 4/5 weeks.

compiler-errors · 2025-01-18T04:21:22Z

#135673 (comment)

@rustbot label: +beta-nominated

Nadrieril · 2025-01-19T21:28:23Z

well, merging because ICE and backports, would be nice to get a repro eventually but also shrug

@bors r+

bors · 2025-01-19T21:28:26Z

📌 Commit 93a1950 has been approved by Nadrieril

It is now in the queue for this repository.

Always force non-trimming of path in `unreachable_patterns` lint Creating a "trimmed DefID path" when no error is being emitted is an ICE (on purpose). If we create a trimmed path for a lint that is then silenced before being emitted causes a known ICE. This side-steps the issue by always using `with_no_trimmed_path!`. This was verified to fix https://github.com/quinn-rs/quinn/, but couldn't write a repro case for the test suite. Fix rust-lang#135289.

…llaumeGomez Rollup of 8 pull requests Successful merges: - rust-lang#135310 (Always force non-trimming of path in `unreachable_patterns` lint) - rust-lang#135446 (further improve panic_immediate_abort by removing rtprintpanic! messages) - rust-lang#135491 (Remove dead rustc_allowed_through_unstable_modules for std::os::fd contents) - rust-lang#135542 (Add the concrete syntax for precise capturing to 1.82 release notes.) - rust-lang#135700 (Emit single privacy error for struct literal with multiple private fields and add test for `default_field_values` privacy) - rust-lang#135729 (Add debug assertions to compiler profile) - rust-lang#135736 (rustdoc: Fix flaky doctest test) - rust-lang#135738 (Replace usages of `map_or(bool, ...)` with `is_{some_and|none_or|ok_and}`) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 5 pull requests Successful merges: - rust-lang#134276 (fully de-stabilize all custom inner attributes) - rust-lang#135237 (Match Ergonomics 2024: document and reorganize the currently-implemented feature gates) - rust-lang#135310 (Always force non-trimming of path in `unreachable_patterns` lint) - rust-lang#135446 (further improve panic_immediate_abort by removing rtprintpanic! messages) - rust-lang#135491 (Remove dead rustc_allowed_through_unstable_modules for std::os::fd contents) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#135310 - estebank:issue-135289, r=Nadrieril Always force non-trimming of path in `unreachable_patterns` lint Creating a "trimmed DefID path" when no error is being emitted is an ICE (on purpose). If we create a trimmed path for a lint that is then silenced before being emitted causes a known ICE. This side-steps the issue by always using `with_no_trimmed_path!`. This was verified to fix https://github.com/quinn-rs/quinn/, but couldn't write a repro case for the test suite. Fix rust-lang#135289.

estebank · 2025-01-20T18:50:37Z

@Nadrieril #135289 (comment)

Nadrieril · 2025-01-20T22:24:57Z

thx for your investigation @estebank btw!

lqd · 2025-01-20T22:36:48Z

A fixme would also be good, at least to track that the fix is suboptimal and more of a workaround for the ICE. But the test is a prerequisite for analysis to even know what the principled fix is in the first place. Maybe others can help.

Add fixme and test for issue rust-lang#135289 This PR: - adds a test minimizing issue rust-lang#135289 for PR rust-lang#135310 - adds a fixme about the suboptimal fix for the ICE I've verified the test indeed ICEs with 3f2f695 reverted. r? `@estebank`

Rollup merge of rust-lang#135833 - lqd:add-ice-test, r=compiler-errors Add fixme and test for issue rust-lang#135289 This PR: - adds a test minimizing issue rust-lang#135289 for PR rust-lang#135310 - adds a fixme about the suboptimal fix for the ICE I've verified the test indeed ICEs with 3f2f695 reverted. r? `@estebank`

apiraino · 2025-01-23T15:11:29Z

Beta backport accepted as per compiler team on Zulip. A backport PR will be authored by the release team at the end of the current development cycle. Backport labels handled by them.

@rustbot label +beta-accepted

[beta] backports - Always force non-trimming of path in `unreachable_patterns` lint rust-lang#135310 - Add Profile Override for Non-Git Sources rust-lang#135433 - resolve symlinks of LLVM tool binaries before copying them rust-lang#135585 - add cache to `AmbiguityCausesVisitor` rust-lang#135618 - When LLVM's location discriminator value limit is exceeded, emit locations with dummy spans instead of dropping them entirely rust-lang#135643 - Temporarily bring back `Rvalue::Len` rust-lang#135709 - make it possible to use ci-rustc on tarball sources rust-lang#135722 - Remove test panic from File::open rust-lang#135837 - Only assert the `Parser` size on specific arches rust-lang#135855 r? cuviper

[beta] backports - Always force non-trimming of path in `unreachable_patterns` lint rust-lang#135310 - Add Profile Override for Non-Git Sources rust-lang#135433 - resolve symlinks of LLVM tool binaries before copying them rust-lang#135585 - add cache to `AmbiguityCausesVisitor` rust-lang#135618 - When LLVM's location discriminator value limit is exceeded, emit locations with dummy spans instead of dropping them entirely rust-lang#135643 - Temporarily bring back `Rvalue::Len` rust-lang#135709 - make it possible to use ci-rustc on tarball sources rust-lang#135722 - Remove test panic from File::open rust-lang#135837 - Only assert the `Parser` size on specific arches rust-lang#135855 - [beta] TRPL: more backward-compatible Edition changes rust-lang#135843 r? cuviper

[beta] backports - Always force non-trimming of path in `unreachable_patterns` lint rust-lang#135310 - Add Profile Override for Non-Git Sources rust-lang#135433 - resolve symlinks of LLVM tool binaries before copying them rust-lang#135585 - add cache to `AmbiguityCausesVisitor` rust-lang#135618 - When LLVM's location discriminator value limit is exceeded, emit locations with dummy spans instead of dropping them entirely rust-lang#135643 - make it possible to use ci-rustc on tarball sources rust-lang#135722 - Remove test panic from File::open rust-lang#135837 - Only assert the `Parser` size on specific arches rust-lang#135855 - [beta] TRPL: more backward-compatible Edition changes rust-lang#135843 r? cuviper

rustbot assigned Nadrieril Jan 9, 2025

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 9, 2025

estebank mentioned this pull request Jan 9, 2025

ICE: trimmed_def_paths called, diagnostics were expected but none were emitted #135289

Closed

compiler-errors mentioned this pull request Jan 18, 2025

regression: ICE: trimmed_def_paths called, diagnostics were expected but none were emitted #135673

Closed

rustbot added the beta-nominated Nominated for backporting to the compiler in the beta channel. label Jan 18, 2025

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 19, 2025

GuillaumeGomez mentioned this pull request Jan 19, 2025

Rollup of 8 pull requests #135746

Closed

jieyouxu mentioned this pull request Jan 20, 2025

Rollup of 5 pull requests #135755

Merged

bors merged commit 3f2f695 into rust-lang:master Jan 20, 2025
6 checks passed

rustbot added this to the 1.86.0 milestone Jan 20, 2025

lqd mentioned this pull request Jan 21, 2025

Add fixme and test for issue #135289 #135833

Merged

rustbot added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Jan 23, 2025

cuviper mentioned this pull request Jan 24, 2025

[beta] backports #136017

Merged

cuviper modified the milestones: 1.86.0, 1.85.0 Jan 24, 2025

cuviper removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Jan 24, 2025

Always force non-trimming of path in unreachable_patterns lint #135310

Always force non-trimming of path in unreachable_patterns lint #135310

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Always force non-trimming of path in `unreachable_patterns` lint #135310

Always force non-trimming of path in `unreachable_patterns` lint #135310

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