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explicitly handle auto trait leakage in coherence

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This commit is contained in:
lcnr
2023-10-13 09:42:51 +00:00
parent 2763ca50da
commit 1bc6ae4401
5 changed files with 38 additions and 17 deletions
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5
compiler/rustc_trait_selection/src/solve/trait_goals.rs
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@@ -136,12 +136,13 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
// `assemble_candidates_after_normalizing_self_ty`, and we'd
// just be registering an identical candidate here.
//
// Returning `Err(NoSolution)` here is ok in `SolverMode::Coherence`
// since we'll always be registering an ambiguous candidate in
// We always return `Err(NoSolution)` here in `SolverMode::Coherence`
// since we'll always register an ambiguous candidate in
// `assemble_candidates_after_normalizing_self_ty` due to normalizing
// the TAIT.
if let ty::Alias(ty::Opaque, opaque_ty) = goal.predicate.self_ty().kind() {
if matches!(goal.param_env.reveal(), Reveal::All)
|| matches!(ecx.solver_mode(), SolverMode::Coherence)
|| opaque_ty
.def_id
.as_local()