bjoernager/rust
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Stop calling impl_polarity when impl_trait_ref was also called

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This commit is contained in:
Oli Scherer 2024-02-10 22:27:03 +00:00
parent ab0e8b3145
commit b43fbe63e7
12 changed files with 96 additions and 77 deletions
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18
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -2404,8 +2404,8 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
impl_def_id: DefId,
obligation: &PolyTraitObligation<'tcx>,
) -> Normalized<'tcx, GenericArgsRef<'tcx>> {
let impl_trait_ref = self.tcx().impl_trait_ref(impl_def_id).unwrap();
match self.match_impl(impl_def_id, impl_trait_ref, obligation) {
let impl_trait_header = self.tcx().impl_trait_header(impl_def_id).unwrap();
match self.match_impl(impl_def_id, impl_trait_header, obligation) {
Ok(args) => args,
Err(()) => {
// FIXME: A rematch may fail when a candidate cache hit occurs
@ -2438,7 +2438,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
fn match_impl(
&mut self,
impl_def_id: DefId,
impl_trait_ref: EarlyBinder<ty::TraitRef<'tcx>>,
impl_trait_header: EarlyBinder<ty::ImplTraitHeader<'tcx>>,
obligation: &PolyTraitObligation<'tcx>,
) -> Result<Normalized<'tcx, GenericArgsRef<'tcx>>, ()> {
let placeholder_obligation =
@ -2447,12 +2447,12 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
let impl_args = self.infcx.fresh_args_for_item(obligation.cause.span, impl_def_id);
let impl_trait_ref = impl_trait_ref.instantiate(self.tcx(), impl_args);
if impl_trait_ref.references_error() {
let impl_trait_header = impl_trait_header.instantiate(self.tcx(), impl_args);
if impl_trait_header.references_error() {
return Err(());
}
debug!(?impl_trait_ref);
debug!(?impl_trait_header);
let Normalized { value: impl_trait_ref, obligations: mut nested_obligations } =
ensure_sufficient_stack(|| {
@ -2461,7 +2461,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
obligation.param_env,
obligation.cause.clone(),
obligation.recursion_depth + 1,
impl_trait_ref,
impl_trait_header.trait_ref,
)
});
@ -2482,9 +2482,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
})?;
nested_obligations.extend(obligations);
if !self.is_intercrate()
&& self.tcx().impl_polarity(impl_def_id) == ty::ImplPolarity::Reservation
{
if !self.is_intercrate() && impl_trait_header.polarity == ty::ImplPolarity::Reservation {
debug!("reservation impls only apply in intercrate mode");
return Err(());
}