Unify region variables when projecting associated types #73452
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This is required to avoid cycles when evaluating auto trait predicates.
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⌛ Trying commit ba2ef58 with merge 1f5caa606e035dcb2a87c8910a53d6f63b2e9eee... |
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nikomatsakis
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| let r = if vid == resolved_vid { | ||
| r | ||
| } else { | ||
| self.tcx.mk_region(ty::ReVar(resolved_vid)) |
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Nit: can we refactor with a helper like
self.tcx.reuse_or_mk_region(r, ty::ReVar(resolved_vid))I guess it wouldn't be quite as fast. I'd like to see that pattern used in more places, though.
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r=me with or without nit |
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…arth Rollup of 16 pull requests Successful merges: - rust-lang#71420 (Specialization is unsound) - rust-lang#71899 (Refactor `try_find` a little) - rust-lang#72689 (add str to common types) - rust-lang#72791 (update coerce docs and unify relevant tests) - rust-lang#72934 (forbid mutable references in all constant contexts except for const-fns) - rust-lang#73027 (Make `need_type_info_err` more conservative) - rust-lang#73347 (Diagnose use of incompatible sanitizers) - rust-lang#73359 (shim.rs: avoid creating `Call` terminators calling `Self`) - rust-lang#73399 (Clean up E0668 explanation) - rust-lang#73436 (Clean up E0670 explanation) - rust-lang#73440 (Add src/librustdoc as an alias for src/tools/rustdoc) - rust-lang#73442 (pretty/mir: const value enums with no variants) - rust-lang#73452 (Unify region variables when projecting associated types) - rust-lang#73458 (Use alloc::Layout in DroplessArena API) - rust-lang#73484 (Update the doc for std::prelude to the correct behavior) - rust-lang#73506 (Bump Rustfmt and RLS) Failed merges: r? @ghost
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…ion-error, r=nikomatsakis Don't immediately error for cycles during normalization rust-lang#73452 meant some normalization cycles could be detected earlier, breaking some code. This PR makes defers errors for normalization cycles to fulfillment, fixing said code. Fixes rust-lang#74868 r? @nikomatsakis
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This is required to avoid cycles when evaluating auto trait predicates.
Notably, this is required to be able add Chalk types to
CtxtInternersforcfg(parallel_compiler).r? @nikomatsakis