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Only walk local items instead of filtering for them later

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This commit is contained in:
Oli Scherer 2025-04-01 10:06:27 +00:00
parent 798987982c
commit 49c74d29fd
2 changed files with 18 additions and 22 deletions
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34
compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
View File

@ -1730,25 +1730,23 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
.is_accessible_from(self.item_def_id(), tcx)
&& tcx.all_impls(*trait_def_id)
.any(|impl_def_id| {
let impl_header = tcx.impl_trait_header(impl_def_id);
impl_header.is_some_and(|header| {
let trait_ref = header.trait_ref.instantiate(
tcx,
infcx.fresh_args_for_item(DUMMY_SP, impl_def_id),
);
let header = tcx.impl_trait_header(impl_def_id).unwrap();
let trait_ref = header.trait_ref.instantiate(
tcx,
infcx.fresh_args_for_item(DUMMY_SP, impl_def_id),
);
let value = fold_regions(tcx, qself_ty, |_, _| tcx.lifetimes.re_erased);
// FIXME: Don't bother dealing with non-lifetime binders here...
if value.has_escaping_bound_vars() {
return false;
}
infcx
.can_eq(
ty::ParamEnv::empty(),
trait_ref.self_ty(),
value,
) && header.polarity != ty::ImplPolarity::Negative
})
let value = fold_regions(tcx, qself_ty, |_, _| tcx.lifetimes.re_erased);
// FIXME: Don't bother dealing with non-lifetime binders here...
if value.has_escaping_bound_vars() {
return false;
}
infcx
.can_eq(
ty::ParamEnv::empty(),
trait_ref.self_ty(),
value,
) && header.polarity != ty::ImplPolarity::Negative
})
})
.map(|trait_def_id| tcx.def_path_str(trait_def_id))

6
compiler/rustc_passes/src/dead.rs
View File

@ -421,10 +421,8 @@ impl<'tcx> MarkSymbolVisitor<'tcx> {
}
hir::ItemKind::ForeignMod { .. } => {}
hir::ItemKind::Trait(..) => {
for impl_def_id in self.tcx.all_impls(item.owner_id.to_def_id()) {
if let Some(local_def_id) = impl_def_id.as_local()
&& let ItemKind::Impl(impl_ref) =
self.tcx.hir_expect_item(local_def_id).kind
for &impl_def_id in self.tcx.local_trait_impls(item.owner_id.def_id) {
if let ItemKind::Impl(impl_ref) = self.tcx.hir_expect_item(impl_def_id).kind
{
// skip items
// mark dependent traits live