Typecheck patterns of all match arms first, so we get types for bindings #55819
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r? @estebank (rust_highfive has picked a reviewer for you, use r? to override) |
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Might this PR fix this issue? #55820 |
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@bors r+ |
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📌 Commit 5f91373 has been approved by |
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Accepting for backport. |
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…ts-eagerly, r=oli-obk Typecheck patterns of all match arms first, so we get types for bindings Fix eventually (after backport to beta) the issue rust-lang#55810
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Rollup of 17 pull requests Successful merges: - #55630 (resolve: Filter away macro prelude in modules with `#[no_implicit_prelude]` on 2018 edition) - #55687 (Take supertraits into account when calculating associated types) - #55745 (Convert `outlives_components`' return value to a `SmallVec` outparam.) - #55764 (Fix Rc/Arc allocation layout) - #55792 (Prevent ICE in const-prop array oob check) - #55799 (Removed unneeded instance of `// revisions` from a lint test) - #55800 (Fix ICE in `return_type_impl_trait`) - #55801 (NLL: Update box insensitivity test) - #55802 (Don't inline virtual calls (take 2)) - #55816 (Use `SmallVec` to avoid allocations in `from_decimal_string`.) - #55819 (Typecheck patterns of all match arms first, so we get types for bindings) - #55822 (ICE with #![feature(nll)] and elided lifetimes) - #55828 (Add missing `rustc_promotable` attribute to unsigned `min_value` and `max_value`) - #55839 (Fix docstring spelling mistakes) - #55844 (Fix documentation typos.) - #55845 (Set BINARYEN_TRAP_MODE=clamp) - #55856 (rustdoc: refactor: move all static-file include!s into a single module)
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☔ The latest upstream changes (presumably #55859) made this pull request unmergeable. Please resolve the merge conflicts. |
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| // bindings. | ||
| let all_arm_pats_diverge = arms.iter().map(|arm| { | ||
| // rust-lang/rust#55810: Typecheck patterns first (via eager | ||
| // collection into `Vec`), so we get types for all bindings. |
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Ahh, had I seen this PR, I would've suggested adding a note that the map below has side-effects in terms of type inference (unifying the types of all the arms together), and that's why it has to fully complete first.
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Fix eventually (after backport to beta) the issue #55810