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This commit is contained in:
Michael Goulet 2023-08-10 21:15:19 +00:00
parent 439d066bcf
commit 540afe202f
4 changed files with 9 additions and 9 deletions
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8
compiler/rustc_hir_typeck/src/coercion.rs
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@ -510,9 +510,11 @@ fn coerce_borrowed_pointer(
success(adjustments, ty, obligations) success(adjustments, ty, obligations)
} }
// &[T; n] or &mut [T; n] -> &[T] /// Performs [unsized coercion] by emulating a fulfillment loop on a
// or &mut [T; n] -> &mut [T] /// `CoerceUnsized` goal until all `CoerceUnsized` and `Unsize` goals
// or &Concrete -> &Trait, etc. /// are successfully selected.
///
/// [unsized coercion](https://doc.rust-lang.org/reference/type-coercions.html#unsized-coercions)
#[instrument(skip(self), level = "debug")] #[instrument(skip(self), level = "debug")]
fn coerce_unsized(&self, mut source: Ty<'tcx>, mut target: Ty<'tcx>) -> CoerceResult<'tcx> { fn coerce_unsized(&self, mut source: Ty<'tcx>, mut target: Ty<'tcx>) -> CoerceResult<'tcx> {
source = self.shallow_resolve(source); source = self.shallow_resolve(source);

4
compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
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@ -618,8 +618,6 @@ fn self_type_matches_expected_vid(&self, self_ty: Ty<'tcx>, expected_vid: ty::Ty
match *self_ty.kind() { match *self_ty.kind() {
ty::Infer(ty::TyVar(found_vid)) => { ty::Infer(ty::TyVar(found_vid)) => {
// FIXME: consider using `sub_root_var` here so we
// can see through subtyping.
let found_vid = self.root_var(found_vid); let found_vid = self.root_var(found_vid);
debug!("self_type_matches_expected_vid - found_vid={:?}", found_vid); debug!("self_type_matches_expected_vid - found_vid={:?}", found_vid);
expected_vid == found_vid expected_vid == found_vid
@ -634,8 +632,6 @@ pub(in super::super) fn obligations_for_self_ty<'b>(
self_ty: ty::TyVid, self_ty: ty::TyVid,
) -> impl DoubleEndedIterator<Item = traits::PredicateObligation<'tcx>> + Captures<'tcx> + 'b ) -> impl DoubleEndedIterator<Item = traits::PredicateObligation<'tcx>> + Captures<'tcx> + 'b
{ {
// FIXME: consider using `sub_root_var` here so we
// can see through subtyping.
let ty_var_root = self.root_var(self_ty); let ty_var_root = self.root_var(self_ty);
trace!("pending_obligations = {:#?}", self.fulfillment_cx.borrow().pending_obligations()); trace!("pending_obligations = {:#?}", self.fulfillment_cx.borrow().pending_obligations());

2
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -2394,7 +2394,7 @@ fn rematch_impl(
Ok(args) => args, Ok(args) => args,
Err(()) => { Err(()) => {
// FIXME: A rematch may fail when a candidate cache hit occurs // FIXME: A rematch may fail when a candidate cache hit occurs
// on thefreshened form of the trait predicate, but the match // on the freshened form of the trait predicate, but the match
// fails for some reason that is not captured in the freshened // fails for some reason that is not captured in the freshened
// cache key. For example, equating an impl trait ref against // cache key. For example, equating an impl trait ref against
// the placeholder trait ref may fail due the Generalizer relation // the placeholder trait ref may fail due the Generalizer relation

4
compiler/rustc_type_ir/src/sty.rs
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@ -200,7 +200,9 @@ pub enum TyKind<I: Interner> {
/// A tuple type. For example, `(i32, bool)`. /// A tuple type. For example, `(i32, bool)`.
Tuple(I::ListTy), Tuple(I::ListTy),
/// A projection or opaque type. Both of these types /// A projection, opaque type, weak type alias, or inherent associated type.
/// All of these types are represented as pairs of def-id and args, and can
/// be normalized, so they are grouped conceptually.
Alias(AliasKind, I::AliasTy), Alias(AliasKind, I::AliasTy),
/// A type parameter; for example, `T` in `fn f<T>(x: T) {}`. /// A type parameter; for example, `T` in `fn f<T>(x: T) {}`.