Fix some docs in std::rt::task #11571
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Could you squash these commits into one? |
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@alexcrichton done |
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There might be a reason, but I failed to see why these comments couldn't be proper rust docs.
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Properly infer types with type casts This PR reenables `Expectation::Castable` (previous attempt at rust-lang#14104, reverted by rust-lang#14120) and implements type cast checks, which enable us to infer a bit more. Castable expectations are relatively weak -- they only influence the inference if we cannot infer the types by other means. Therefore, we need to defer possible type unification with the casted type until we type check all expressions of the body. This PR adds a struct and slots in `InferenceContext` for the deferred cast checks (c.f. [`CastCheck`] in `rustc_hir_typeck`). I only implemented the bits that affect the inference result. It should be possible to return type adjustments for well-formed casts and report diagnostics for invalid casts, but I'm leaving them for future work for now. Fixes rust-lang#11571 Fixes rust-lang#15246 [`CastCheck`]: https://github.com/rust-lang/rust/blob/da1d099f91ea387a2814a6244dd875a2048b486f/compiler/rustc_hir_typeck/src/cast.rs#L55
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There might be a reason, but I failed to see why these comments couldn't be proper rust docs.