Fix an opaque type ICE #105897
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Fix an opaque type ICE #105897
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☔ The latest upstream changes (presumably #105905) made this pull request unmergeable. Please resolve the merge conflicts. |
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r=me after conflicts are addressed. |
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Fix an opaque type ICE fixes rust-lang#104551 The issue is that if you have ```rust type T = impl Sized; let (_a, _b): T = .. ``` we have only the type annotation `T`, but want to use that ascription for `_a` and `_b`, so what we generate is a type ascription plus a field projection saying `_a`'s type is `T::0`. Of course `T` has no fields. Of course we could also not generate type annotations for projections into opaque types at all, but that's more fragile, as we now have to make sure that https://github.com/rust-lang/rust/blob/12bbdbdb440119a0b86d2ee742ec1460cdb2c5b9/compiler/rustc_mir_build/src/build/matches/mod.rs#L709 doesn't have any arm that introduces a user type annotation except for `PatKind::Binding`.
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#105791 (docs: add long error explanation for error E0472) - rust-lang#105897 (Fix an opaque type ICE) - rust-lang#105904 (Fix arch flag on i686-apple-darwin) - rust-lang#105949 (Bump `cfg-if` to `1.0` in rustc crates) - rust-lang#105964 (rustdoc: prevent CSS layout of line numbers shrinking into nothing) - rust-lang#105972 (rustdoc: simplify section anchor CSS) - rust-lang#105973 (Avoid going through the happy path in case of non-fn builtin calls) - rust-lang#105976 (Remove unused `check-stage2-T-arm-linux-androideabi-H-x86_64-unknown-linux-gnu` make rule) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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fixes #104551
The issue is that if you have
we have only the type annotation
T, but want to use that ascription for_aand_b, so what we generate is a type ascription plus a field projection saying_a's type isT::0. Of courseThas no fields. Of course we could also not generate type annotations for projections into opaque types at all, but that's more fragile, as we now have to make sure that https://github.com/rust-lang/rust/blob/12bbdbdb440119a0b86d2ee742ec1460cdb2c5b9/compiler/rustc_mir_build/src/build/matches/mod.rs#L709 doesn't have any arm that introduces a user type annotation except forPatKind::Binding.