Don't fire OPAQUE_HIDDEN_INFERRED_BOUND on sized return of AFIT
#120360
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…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#117420 (Make `#![allow_internal_unstable(..)]` work with `stmt_expr_attributes`) - rust-lang#117678 (Stabilize `slice_group_by`) - rust-lang#119917 (Remove special-case handling of `vec.split_off(0)`) - rust-lang#120117 (Update `std::io::Error::downcast` return type) - rust-lang#120329 (RFC 3349 precursors) - rust-lang#120339 (privacy: Refactor top-level visiting in `NamePrivacyVisitor`) - rust-lang#120345 (Clippy subtree update) - rust-lang#120360 (Don't fire `OPAQUE_HIDDEN_INFERRED_BOUND` on sized return of AFIT) - rust-lang#120372 (Fix outdated comment on Box) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#120360 - compiler-errors:afit-sized-lol, r=lcnr Don't fire `OPAQUE_HIDDEN_INFERRED_BOUND` on sized return of AFIT Conceptually, we should probably not fire `OPAQUE_HIDDEN_INFERRED_BOUND` for methods like: ``` trait Foo { async fn bar() -> Self; } ``` Even though we technically cannot prove that `Self: Sized`, which is one of the item bounds of the `Output` type in the `-> impl Future<Output = Sized>` from the async desugaring. This is somewhat justifiable along the same lines as how we allow regular methods to return `-> Self` even though `Self` isn't sized. Fixes rust-lang#113538 (side-note: some days i wonder if we should just remove the `OPAQUE_HIDDEN_INFERRED_BOUND` lint... it does make me sad that we have non-well-formed types in signatures, though.)
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Conceptually, we should probably not fire
OPAQUE_HIDDEN_INFERRED_BOUNDfor methods like:Even though we technically cannot prove that
Self: Sized, which is one of the item bounds of theOutputtype in the-> impl Future<Output = Sized>from the async desugaring.This is somewhat justifiable along the same lines as how we allow regular methods to return
-> Selfeven thoughSelfisn't sized.Fixes #113538
(side-note: some days i wonder if we should just remove the
OPAQUE_HIDDEN_INFERRED_BOUNDlint... it does make me sad that we have non-well-formed types in signatures, though.)