Normalize opaques before defining them in the new solver #116369
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Some changes occurred to the core trait solver cc @rust-lang/initiative-trait-system-refactor |
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☔ The latest upstream changes (presumably #116598) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #116958) made this pull request unmergeable. Please resolve the merge conflicts. |
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Closing in favor of @lcnr's approach. |
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…rors new solver normalization improvements cool beans At the core of this PR is a `try_normalize_ty` which stops for rigid aliases by using `commit_if_ok`. Reworks alias-relate to fully normalize both the lhs and rhs and then equate the resulting rigid (or inference) types. This fixes rust-lang/trait-system-refactor-initiative#68 by avoiding the exponential blowup. Also supersedes rust-lang#116369 by only defining opaque types if the hidden type is rigid. I removed the stability check in `EvalCtxt::evaluate_goal` due to rust-lang/trait-system-refactor-initiative#75. While I personally have opinions on how to fix it, that still requires further t-types/`@nikomatsakis` buy-in, so I removed that for now. Once we've decided on our approach there, we can revert this commit. r? `@compiler-errors`
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We normalize the hidden type of an opaque before defining it to ensure that we don't:
Tests are a combination of things that went from ICE -> (expected) fail, and fail -> pass.
r? lcnr