bjoernager/rust
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Cache supertrait outlives of impl header for soundness check

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This commit is contained in:
Michael Goulet 2024-08-06 13:33:32 -04:00
parent 60d146580c
commit 79228526bf
4 changed files with 42 additions and 26 deletions
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42
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -17,7 +17,6 @@ use rustc_hir::LangItem;
use rustc_infer::infer::relate::TypeRelation;
use rustc_infer::infer::BoundRegionConversionTime::{self, HigherRankedType};
use rustc_infer::infer::DefineOpaqueTypes;
use rustc_infer::traits::util::elaborate;
use rustc_infer::traits::TraitObligation;
use rustc_middle::bug;
use rustc_middle::dep_graph::{dep_kinds, DepNodeIndex};
@ -2801,31 +2800,22 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
}
// Register any outlives obligations from the trait here, cc #124336.
if matches!(self.tcx().def_kind(def_id), DefKind::Impl { of_trait: true })
&& let Some(header) = self.tcx().impl_trait_header(def_id)
{
let trait_clause: ty::Clause<'tcx> =
header.trait_ref.instantiate(self.tcx(), args).upcast(self.tcx());
for clause in elaborate(self.tcx(), [trait_clause]) {
if matches!(
clause.kind().skip_binder(),
ty::ClauseKind::TypeOutlives(..) | ty::ClauseKind::RegionOutlives(..)
) {
let clause = normalize_with_depth_to(
self,
param_env,
cause.clone(),
recursion_depth,
clause,
&mut obligations,
);
obligations.push(Obligation {
cause: cause.clone(),
recursion_depth,
param_env,
predicate: clause.as_predicate(),
});
}
if matches!(tcx.def_kind(def_id), DefKind::Impl { of_trait: true }) {
for clause in tcx.impl_super_outlives(def_id).iter_instantiated(tcx, args) {
let clause = normalize_with_depth_to(
self,
param_env,
cause.clone(),
recursion_depth,
clause,
&mut obligations,
);
obligations.push(Obligation {
cause: cause.clone(),
recursion_depth,
param_env,
predicate: clause.as_predicate(),
});
}
}