bjoernager/rust
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Further simplifications

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This commit is contained in:
Michael Goulet 2024-11-24 23:08:19 +00:00
parent 15dff274d0
commit 871cfc9dff
1 changed files with 15 additions and 21 deletions
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36
compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
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@ -702,8 +702,8 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>(
let mut remapped_types = DefIdMap::default();
for (def_id, (ty, args)) in collected_types {
match infcx.fully_resolve((ty, args)) {
Ok((ty, args)) => {
match infcx.fully_resolve(ty) {
Ok(ty) => {
// `ty` contains free regions that we created earlier while liberating the
// trait fn signature. However, projection normalization expects `ty` to
// contains `def_id`'s early-bound regions.
@ -883,33 +883,27 @@ impl<'tcx> ty::FallibleTypeFolder<TyCtxt<'tcx>> for RemapHiddenTyRegions<'tcx> {
self.tcx
}
fn try_fold_ty(&mut self, t: Ty<'tcx>) -> Result<Ty<'tcx>, Self::Error> {
if let ty::Alias(ty::Opaque, ty::AliasTy { args, def_id, .. }) = *t.kind() {
let mut mapped_args = Vec::with_capacity(args.len());
for (arg, v) in std::iter::zip(args, self.tcx.variances_of(def_id)) {
mapped_args.push(match (arg.unpack(), v) {
// Skip uncaptured opaque args
(ty::GenericArgKind::Lifetime(_), ty::Bivariant) => arg,
_ => arg.try_fold_with(self)?,
});
}
Ok(Ty::new_opaque(self.tcx, def_id, self.tcx.mk_args(&mapped_args)))
} else {
t.try_super_fold_with(self)
}
}
fn try_fold_region(
&mut self,
region: ty::Region<'tcx>,
) -> Result<ty::Region<'tcx>, Self::Error> {
match region.kind() {
// Remap late-bound regions from the function.
// Never remap bound regions or `'static`
ty::ReBound(..) | ty::ReStatic | ty::ReError(_) => return Ok(region),
// We always remap liberated late-bound regions from the function.
ty::ReLateParam(_) => {}
// Remap early-bound regions as long as they don't come from the `impl` itself,
// in which case we don't really need to renumber them.
ty::ReEarlyParam(ebr) if ebr.index as usize >= self.num_impl_args => {}
_ => return Ok(region),
ty::ReEarlyParam(ebr) => {
if ebr.index as usize >= self.num_impl_args {
// Remap
} else {
return Ok(region);
}
}
ty::ReVar(_) | ty::RePlaceholder(_) | ty::ReErased => unreachable!(
"should not have leaked vars or placeholders into hidden type of RPITIT"
),
}
let e = if let Some(id_region) = self.map.get(&region) {