Get rid of subst-relate incompleteness in new solver #113901
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Some changes occurred to the core trait solver cc @rust-lang/initiative-trait-system-refactor |
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Jul 21, 2023
| @@ -81,9 +83,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { | |||
| // As this is incomplete, we must not do so during coherence. | |||
| match self.solver_mode() { | |||
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this comment is wrong, please also link to rust-lang/trait-system-refactor-initiative#25
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@bors r=lcnr rollup |
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…iaskrgr Rollup of 6 pull requests Successful merges: - rust-lang#112508 (Tweak spans for self arg, fix borrow suggestion for signature mismatch) - rust-lang#113901 (Get rid of subst-relate incompleteness in new solver) - rust-lang#113948 (Fix rustc-args passing issue in bootstrap) - rust-lang#113950 (Remove Scope::Elision from bound-vars resolution.) - rust-lang#113957 (Add regression test for issue rust-lang#113941 - naive layout isn't refined) - rust-lang#113959 (Migrate GUI colors test to original CSS color format) r? `@ghost` `@rustbot` modify labels: rollup
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We shouldn't need subst-relate if we have bidirectional-normalizes-to in the new solver.
The only potential issue may happen if we have an unconstrained projection like
<Wrapper<?0> as Trait>::Assoc == <Wrapper<T> as Trait>::Assocwhere they both normalize to something that doesn't mention any substs, which would possibly prefer?0 = Tif we fall back to subst-relate. But I'd prefer if we remove incompleteness until we can determine some case where we need them, and the bidirectional-normalizes-to seems better to have in general.I can update rust-lang/trait-system-refactor-initiative#26 and rust-lang/trait-system-refactor-initiative#25 once this lands.
r? @lcnr