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Erase regions before doing uninhabited check in borrowck #107532

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@compiler-errors compiler-errors commented Jan 31, 2023

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 #107505

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rustbot commented Jan 31, 2023

r? @jackh726

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@rustbot rustbot added A-query-system Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html) 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 31, 2023
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A little bit more background here, on the problem and the fix, would be helpful. I can understand why it's okay to do this, but not why it's needed.

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compiler-errors commented Jan 31, 2023

but not why it's needed

Not sure exactly whether you're looking for:

Does that make sense? I can go into more detail if you'd like.

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Right, I'm more curious why we have unresolved inference variables?

r=me, but a comment would be nice

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compiler-errors commented Jan 31, 2023

Oh, it's unresolved region vids, cause it's MIR borrowck and we haven't yet done the region solving yet 😆 I'll leave a comment

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Gonna drop bbf3383 from this, since that's blocked on some rustdoc + const eval bug :/

I'm still gonna land the real fix for the issue, though.

@compiler-errors compiler-errors force-pushed the erase-regions-in-uninhabited branch from 24a97e2 to 2c23c7f Compare February 1, 2023 01:15
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@bors r=jackh726

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bors commented Feb 1, 2023

📌 Commit 2c23c7f has been approved by jackh726

It is now in the queue for this repository.

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bors commented Feb 1, 2023

🌲 The tree is currently closed for pull requests below priority 50. This pull request will be tested once the tree is reopened.

@bors 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 Feb 1, 2023
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Feb 2, 2023
…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
bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 2, 2023
…iaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#106919 (Recover `_` as `..` in field pattern)
 - rust-lang#107493 (Improve diagnostic for missing space in range pattern)
 - rust-lang#107515 (Improve pretty-printing of `HirIdValidator` errors)
 - rust-lang#107524 (Remove both StorageLive and StorageDead in CopyProp.)
 - rust-lang#107532 (Erase regions before doing uninhabited check in borrowck)
 - rust-lang#107559 (Rename `rust_2015` → `is_rust_2015`)
 - rust-lang#107577 (Reinstate the `hir-stats.rs` tests on stage 1.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 3e0995a into rust-lang:master Feb 2, 2023
@rustbot rustbot added this to the 1.69.0 milestone Feb 2, 2023
@compiler-errors compiler-errors deleted the erase-regions-in-uninhabited branch August 11, 2023 20:00
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Successfully merging this pull request may close these issues.

1.67 mir borrow checking ICE: thread 'rustc' panicked at 'region variables should not be hashed: '_#39r'
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