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short-circuit when proj def ids differ

This commit is contained in:
Michael Goulet 2023-07-27 00:48:51 +00:00
parent 1bb6ae5874
commit 4cc659eb3f
2 changed files with 20 additions and 14 deletions
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9
compiler/rustc_trait_selection/src/solve/trait_goals.rs
View File

@ -625,8 +625,13 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
// in b_ty's bound. Use this to first determine *which* apply without
// having any inference side-effects. We process obligations because
// unification may initially succeed due to deferred projection equality.
let projection_may_match = |ecx: &mut Self, source_projection, target_projection| {
ecx.probe(|_| CandidateKind::UpcastProbe)
let projection_may_match =
|ecx: &mut Self,
source_projection: ty::PolyExistentialProjection<'tcx>,
target_projection: ty::PolyExistentialProjection<'tcx>| {
source_projection.item_def_id() == target_projection.item_def_id()
&& ecx
.probe(|_| CandidateKind::UpcastProbe)
.enter(|ecx| -> Result<(), NoSolution> {
ecx.eq(param_env, source_projection, target_projection)?;
let _ = ecx.try_evaluate_added_goals()?;

3
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
View File

@ -920,7 +920,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
a_data.projection_bounds().filter(|source_projection| {
// Eager normalization means that we can just use can_eq
// here instead of equating and processing obligations.
self.infcx.can_eq(
source_projection.item_def_id() == target_projection.item_def_id()
&& self.infcx.can_eq(
obligation.param_env,
*source_projection,
target_projection,