normalization: avoid incompletely constraining GAT args #140712
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[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 r? `@ghost`
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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