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Do not constraint TAITs when checking impl/trait item compatibility #99356

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merged 1 commit into from
Jul 18, 2022

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@compiler-errors compiler-errors commented Jul 17, 2022

Check out the UI test for the example.

Open to other approaches to fix this issue -- ideally we would be able to collect this opaque type constraint in a way to use it in find_opaque_ty_constraints, so we can report a better mismatch error in the incompatible case, and just allow it in the compatible case. But that seems like a bigger refactor, so I wouldn't want to start it unless someone else thought it was a good idea.

cc #99348
r? @oli-obk

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jul 17, 2022
@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 17, 2022
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oli-obk commented Jul 17, 2022

@ouz-a is working on making this the default behaviour so we have to opt in to either binding a hidden type or "bubbling" out of a query.

Doing fixes in small places like this is good until that happens

@bors r+ rollup

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bors commented Jul 17, 2022

📌 Commit 23cb89e has been approved by oli-obk

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 17, 2022
JohnTitor added a commit to JohnTitor/rust that referenced this pull request Jul 17, 2022
…pertraits, r=oli-obk

Do not constraint TAITs when checking impl/trait item compatibility

Check out the UI test for the example.

Open to other approaches to fix this issue -- ideally we _would_ be able to collect this opaque type constraint in a way to use it in `find_opaque_ty_constraints`, so we can report a better mismatch error in the incompatible case, and just allow it in the compatible case. But that seems like a bigger refactor, so I wouldn't want to start it unless someone else thought it was a good idea.

cc rust-lang#99348
r? `@oli-obk`
This was referenced Jul 17, 2022
bors added a commit to rust-lang-ci/rust that referenced this pull request Jul 18, 2022
Rollup of 6 pull requests

Successful merges:

 - rust-lang#98383 (Remove restrictions on compare-exchange memory ordering.)
 - rust-lang#99350 (Be more precise when suggesting removal of parens on unit ctor)
 - rust-lang#99356 (Do not constraint TAITs when checking impl/trait item compatibility)
 - rust-lang#99360 (Do not ICE when we have `-Zunpretty=expanded` with invalid ABI)
 - rust-lang#99373 (Fix source code sidebar tree auto-expand)
 - rust-lang#99374 (Fix doc for `rchunks_exact`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 3c2175b into rust-lang:master Jul 18, 2022
@rustbot rustbot added this to the 1.64.0 milestone Jul 18, 2022
@compiler-errors compiler-errors deleted the tait-in-assoc-ty-supertraits branch August 11, 2023 20:20
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5 participants