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normalization: avoid incompletely constraining GAT args #140712

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@lcnr lcnr commented May 6, 2025

We need to copy the behavior of #125214 in the new solver. This fixes rust-lang/trait-system-refactor-initiative#202 which seems to be the cause of the regression in deptypes.

r? @compiler-errors

@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. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver) labels May 6, 2025
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r=me after #140260 lands and also drop the middle commit (well, ignore it b/c it will have been made obsolete after that lands)

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@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 6, 2025
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rustbot commented May 6, 2025

Reminder, once the PR becomes ready for a review, use @rustbot ready.

@rust-cloud-vms rust-cloud-vms bot force-pushed the normalization-gat-args branch 2 times, most recently from c180d15 to 5a34adc Compare May 7, 2025 02:31
bors added a commit to rust-lang-ci/rust that referenced this pull request May 7, 2025
[DO NOT MERGE] bootstrap with `-Znext-solver=globally`

A revival of rust-lang#124812.

Current status:

~~`./x.py b --stage 2` passes 🎉~~

`try` builds succeed 🎉 🎉 🎉

[first perf run](rust-lang#133502 (comment)) 👻

### crater

This does not detect hangs or memory issues.

| date | #crates | #regressions |
| ---- | ------- | ------------ |
| 2025.04.11 | 100 | 2 |
| 2025.04.11 | 1000 | 27 |
| 2025.04.17 | 10000 | 456 |
| 2025.04.18 | 10000 | 437 |
| 2025.04.24 | 10000 | 164 |
| 2025.04.26 | 10000 | 108 |
| 2025.04.28 | 10000 | 91 |
| 2025.05.01 | 10000 | 145 woops |
| 2025.05.03 | 624228[^1] |  1585 |
| 2025.05.05 | 8964[^2] | 931 |
| 2025.05.06 | 4401[^2] | 726 |

[^1]: a complete crater run
[^2]: only testing crates which may have regressed from the above run

### in-flight changes

- rust-lang#140711
- rust-lang#140713
- rust-lang#140712
- rust-lang#136997
- rust-lang#139587
- rust-lang#140497
- rust-lang#124852, unsure whether I actually want to land this PR for now
- https://github.com/lcnr/rust/tree/opaque-type-method-call
- rust-lang#140260
- rust-lang#140375
- rust-lang#140405
- look into blanket impls for opaque type infer vars as well
- rust-lang#140496
- double recursion limit in the new solver

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bors commented May 8, 2025

☔ The latest upstream changes (presumably #140781) made this pull request unmergeable. Please resolve the merge conflicts.

@rust-cloud-vms rust-cloud-vms bot force-pushed the normalization-gat-args branch from 5a34adc to 577c497 Compare May 8, 2025 14:49
@rust-cloud-vms rust-cloud-vms bot force-pushed the normalization-gat-args branch from 577c497 to 0185484 Compare May 8, 2025 14:51
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lcnr commented May 8, 2025

@rustbot ready

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 8, 2025
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breakage due to incompletely constraining gat args
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