Don't build `ParamEnv` and do trait solving in `ItemCtxt`s when lowering IATs by BoxyUwU · Pull Request #140247 · rust-lang/rust

BoxyUwU · 2025-04-24T10:15:25Z

Fixes #125879
This was due to updating inhabited predicate stuff which I had to do to make constructing ADTs with IATs in fields not ICE

Fixes #136678 (but no test added, I don't rly care about weird IAT edge cases under GCE)
Fixes #138131

Avoids doing "fully correct" candidate selection for IATs during hir ty lowering when in item signatures as it almost always leads to a query cycle from trying to build a ParamEnv. I replaced it with a use DeepRejectCtxt which should be able to handle this kind of conservative "could these types unify" while in a context where we don't want to do type equality.

This is a relatively simple scheme and should be forwards compatible with doing something more complex/powerful.

I'm not really sure how this interacts with #126651, though I'm also not really sure its super important to support projecting IATs from IAT self types given we don't even support T::Assoc::Other for trait-associated types so didn't give much thought to how this might fit in with that.

r? @compiler-errors
cc @fmease

rustbot · 2025-04-24T10:15:31Z

This PR changes a file inside tests/crashes. If a crash was fixed, please move into the corresponding ui subdir and add 'Fixes #' to the PR description to autoclose the issue upon merge.

HIR ty lowering was modified

cc @fmease

compiler/rustc_hir_analysis/src/collect.rs

bors · 2025-04-28T21:32:11Z

☔ The latest upstream changes (presumably #140388) made this pull request unmergeable. Please resolve the merge conflicts.

compiler-errors · 2025-05-22T09:49:10Z

@bors r+

bors · 2025-05-22T09:49:13Z

📌 Commit 34ce403 has been approved by compiler-errors

It is now in the queue for this repository.

…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#135562 (Add ignore value suggestion in closure body) - rust-lang#139635 (Finalize repeat expr inference behaviour with inferred repeat counts) - rust-lang#139668 (Handle regions equivalent to 'static in non_local_bounds) - rust-lang#140218 (HIR ty lowering: Clean up & refactor the lowering of type-relative paths) - rust-lang#140435 (use uX::from instead of _ as uX in non - const contexts) - rust-lang#141130 (rustc_on_unimplemented cleanups) - rust-lang#141286 (Querify `coroutine_hidden_types`) Failed merges: - rust-lang#140247 (Don't build `ParamEnv` and do trait solving in `ItemCtxt`s when lowering IATs) r? `@ghost` `@rustbot` modify labels: rollup

bors · 2025-05-23T01:02:00Z

☔ The latest upstream changes (presumably #141396) made this pull request unmergeable. Please resolve the merge conflicts.

BoxyUwU · 2025-05-23T14:28:28Z

I should probably update this to use DeepRejectCtxt and handle LTAs correctly like discussed at the all hands 🤔 I was just gonna do it in a followup PR but if I'm having to rebase and figure out new crashes tests then I may aswell just do it all now

compiler/rustc_hir_analysis/src/collect.rs

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

tests/ui/associated-inherent-types/multiple-candidates-in-adt-field-2.rs

lcnr

nits, then r=me

lcnr · 2025-06-18T14:47:23Z

@bors r+ rollup

bors · 2025-06-18T14:47:25Z

📌 Commit e280d26 has been approved by lcnr

It is now in the queue for this repository.

Don't build `ParamEnv` and do trait solving in `ItemCtxt`s when lowering IATs Fixes rust-lang#108491 Fixes rust-lang#125879 This was due to updating inhabited predicate stuff which I had to do to make constructing ADTs with IATs in fields not ICE Fixes rust-lang#136678 (but no test added, I don't rly care about weird IAT edge cases under GCE) Fixes rust-lang#138131 Avoids doing "fully correct" candidate selection for IATs during hir ty lowering when in item signatures as it almost always leads to a query cycle from trying to build a `ParamEnv`. I replaced it with a use `DeepRejectCtxt` which should be able to handle this kind of conservative "could these types unify" while in a context where we don't want to do type equality. This is a relatively simple scheme and should be forwards compatible with doing something more complex/powerful. I'm not really sure how this interacts with rust-lang#126651, though I'm also not really sure its super important to support projecting IATs from IAT self types given we don't even support `T::Assoc::Other` for trait-associated types so didn't give much thought to how this might fit in with that. r? `@compiler-errors` cc `@fmease`

Kobzol · 2025-06-18T16:06:26Z

@bors r-

PR CI failed.

BoxyUwU · 2025-06-18T20:06:35Z

@bors r=lcnr

bors · 2025-06-18T20:06:38Z

📌 Commit 377d8fa has been approved by lcnr

It is now in the queue for this repository.

Rollup of 7 pull requests Successful merges: - #140247 (Don't build `ParamEnv` and do trait solving in `ItemCtxt`s when lowering IATs) - #142507 (use `#[align]` attribute for `fn_align`) - #142524 (Weekly `cargo update`) - #142606 (AsyncDrop trait without sync Drop generates an error) - #142639 (Add a missing colon at the end of the panic location details in location-detail-unwrap-multiline.rs) - #142654 (library: Increase timeout on mpmc test to reduce flakes) - #142692 (Assorted bootstrap cleanups (step 3)) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #140247 - BoxyUwU:iats_no_query_cycles, r=lcnr Don't build `ParamEnv` and do trait solving in `ItemCtxt`s when lowering IATs Fixes #108491 Fixes #125879 This was due to updating inhabited predicate stuff which I had to do to make constructing ADTs with IATs in fields not ICE Fixes #136678 (but no test added, I don't rly care about weird IAT edge cases under GCE) Fixes #138131 Avoids doing "fully correct" candidate selection for IATs during hir ty lowering when in item signatures as it almost always leads to a query cycle from trying to build a `ParamEnv`. I replaced it with a use `DeepRejectCtxt` which should be able to handle this kind of conservative "could these types unify" while in a context where we don't want to do type equality. This is a relatively simple scheme and should be forwards compatible with doing something more complex/powerful. I'm not really sure how this interacts with #126651, though I'm also not really sure its super important to support projecting IATs from IAT self types given we don't even support `T::Assoc::Other` for trait-associated types so didn't give much thought to how this might fit in with that. r? `@compiler-errors` cc `@fmease`

Rollup of 7 pull requests Successful merges: - rust-lang/rust#140247 (Don't build `ParamEnv` and do trait solving in `ItemCtxt`s when lowering IATs) - rust-lang/rust#142507 (use `#[align]` attribute for `fn_align`) - rust-lang/rust#142524 (Weekly `cargo update`) - rust-lang/rust#142606 (AsyncDrop trait without sync Drop generates an error) - rust-lang/rust#142639 (Add a missing colon at the end of the panic location details in location-detail-unwrap-multiline.rs) - rust-lang/rust#142654 (library: Increase timeout on mpmc test to reduce flakes) - rust-lang/rust#142692 (Assorted bootstrap cleanups (step 3)) r? `@ghost` `@rustbot` modify labels: rollup

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fmease mentioned this pull request Apr 29, 2025

Tracking Issue for RFC 3591: useing associated items from traits #134691

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Rollup of 7 pull requests #141396

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Kobzol mentioned this pull request Jun 18, 2025

Rollup of 12 pull requests #142679

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tgross35 mentioned this pull request Jun 19, 2025

Rollup of 7 pull requests #142697

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bors merged commit cff8e9a into rust-lang:master Jun 19, 2025
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github-project-automation bot moved this from In Progress to Done in Inherent Associated Types (IAT) Jun 19, 2025

rustbot added this to the 1.89.0 milestone Jun 19, 2025

matthiaskrgr mentioned this pull request Jun 19, 2025

ICE: .. was equal to .. during selection but now it is not #142717

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matthiaskrgr mentioned this pull request Jun 20, 2025

ICE: unelided lifetime in signature #142773

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fmease mentioned this pull request Sep 29, 2025

Tracking issue for inherent associated types #8995

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fmease mentioned this pull request Nov 5, 2025

Inherent Associated Types feature regression on compiler releases after May. #148535

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fmease mentioned this pull request Dec 9, 2025

Restore diagnostics when no inherent const candidates found #149814

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