Better names for illegal impl trait positions #108066
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Feb 16, 2023
…iaskrgr Rollup of 10 pull requests Successful merges: - rust-lang#107034 (Migrating rustc_infer to session diagnostics (part 4)) - rust-lang#107972 (Fix unintentional UB in ui tests) - rust-lang#108010 (Make `InferCtxt::can_eq` and `InferCtxt::can_sub` return booleans) - rust-lang#108021 (make x look for x.py if shell script does not exist) - rust-lang#108047 (Use `target` instead of `machine` for mir interpreter integer handling.) - rust-lang#108049 (Don't suggest `#[doc(hidden)]` trait methods with matching return type) - rust-lang#108066 (Better names for illegal impl trait positions) - rust-lang#108076 (rustdoc: Use more let chain) - rust-lang#108088 (clarify correctness of `black_box`) - rust-lang#108094 (Demonstrate I/O in File examples) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Feb 23, 2023
…unds-in-bad-position, r=cjgillot Ban associated type bounds in bad positions We should not try to lower associated type bounds into TAITs in positions where `impl Trait` is not allowed (except for in `where` clauses, like `where T: Trait<Assoc: Bound>`). This is achieved by using the same `rustc_ast_lowering` machinery as impl-trait does to characterize positions as universal/existential/disallowed. Fixes rust-lang#106077 Split out the first commit into rust-lang#108066, since it's not really related.
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Just some wording tweaks, no behavior changes.