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Lazy type aliases: Diagnostics: Detect bivariant ty params that are only used recursively #127976

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merged 1 commit into from
Jul 19, 2024

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@fmease fmease commented Jul 19, 2024

Follow-up to errs's #127871. Extends the logic to cover LTAs, too, not just ADTs.
This change only takes effect with the next-gen solver enabled as cycle errors like
the one we have here are fatal in the old solver. That's my explanation anyways.

r? compiler-errors

@fmease fmease added the F-lazy_type_alias `#![feature(lazy_type_alias)]` label Jul 19, 2024
@rustbot 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 Jul 19, 2024
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uwu

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@bors r+ rollup

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bors commented Jul 19, 2024

📌 Commit 756459e has been approved by compiler-errors

It is now in the queue for this repository.

@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 Jul 19, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Jul 19, 2024
…iaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#127295 (CFI: Support provided methods on traits)
 - rust-lang#127814 (`C-cmse-nonsecure-call`: improved error messages)
 - rust-lang#127949 (fix: explain E0120 better cover cases when its raised)
 - rust-lang#127966 (Use structured suggestions for unconstrained generic parameters on impl blocks)
 - rust-lang#127976 (Lazy type aliases: Diagostics: Detect bivariant ty params that are only used recursively)
 - rust-lang#127978 (Avoid ref when using format! for perf)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 115b086 into rust-lang:master Jul 19, 2024
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@rustbot rustbot added this to the 1.81.0 milestone Jul 19, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Jul 19, 2024
Rollup merge of rust-lang#127976 - fmease:lta-cyclic-bivariant-param-better-err, r=compiler-errors

Lazy type aliases: Diagostics: Detect bivariant ty params that are only used recursively

Follow-up to errs's rust-lang#127871. Extends the logic to cover LTAs, too, not just ADTs.
This change only takes effect with the next-gen solver enabled as cycle errors like
the one we have here are fatal in the old solver. That's my explanation anyways.

r? compiler-errors
@fmease fmease deleted the lta-cyclic-bivariant-param-better-err branch July 19, 2024 22:48
@fmease fmease changed the title Lazy type aliases: Diagostics: Detect bivariant ty params that are only used recursively Lazy type aliases: Diagnostics: Detect bivariant ty params that are only used recursively Jul 20, 2024
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4 participants