Anonymize late bound regions on transitive bounds that define assoc type
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@ -292,26 +292,33 @@ pub fn transitive_bounds_that_define_assoc_type<'tcx>(
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tcx: TyCtxt<'tcx>,
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bounds: impl Iterator<Item = ty::PolyTraitRef<'tcx>>,
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assoc_name: Ident,
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) -> FxIndexSet<ty::PolyTraitRef<'tcx>> {
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) -> impl Iterator<Item = ty::PolyTraitRef<'tcx>> {
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let mut stack: Vec<_> = bounds.collect();
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let mut trait_refs = FxIndexSet::default();
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let mut visited = FxIndexSet::default();
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while let Some(trait_ref) = stack.pop() {
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if trait_refs.insert(trait_ref) {
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let super_predicates =
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tcx.super_predicates_that_define_assoc_type((trait_ref.def_id(), Some(assoc_name)));
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for (super_predicate, _) in super_predicates.predicates {
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let bound_predicate = super_predicate.kind();
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let subst_predicate = super_predicate
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.subst_supertrait(tcx, &bound_predicate.rebind(trait_ref.skip_binder()));
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if let Some(binder) = subst_predicate.to_opt_poly_trait_ref() {
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stack.push(binder.value);
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std::iter::from_fn(move || {
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while let Some(trait_ref) = stack.pop() {
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let anon_trait_ref = tcx.anonymize_late_bound_regions(trait_ref);
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if visited.insert(anon_trait_ref) {
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let super_predicates = tcx.super_predicates_that_define_assoc_type((
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trait_ref.def_id(),
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Some(assoc_name),
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));
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for (super_predicate, _) in super_predicates.predicates {
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let bound_predicate = super_predicate.kind();
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let subst_predicate = super_predicate
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.subst_supertrait(tcx, &bound_predicate.rebind(trait_ref.skip_binder()));
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if let Some(binder) = subst_predicate.to_opt_poly_trait_ref() {
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stack.push(binder.value);
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}
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}
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return Some(trait_ref);
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}
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}
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}
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trait_refs
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return None;
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})
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}
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///////////////////////////////////////////////////////////////////////////
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@ -0,0 +1,33 @@
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// check-pass
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pub struct LookupInternedStorage;
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impl<Q> QueryStorageOps<Q> for LookupInternedStorage
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where
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Q: Query,
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for<'d> Q: QueryDb<'d>,
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{
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fn fmt_index(&self, db: &<Q as QueryDb<'_>>::DynDb) {
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<<Q as QueryDb<'_>>::DynDb as HasQueryGroup<Q::Group>>::group_storage(db);
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}
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}
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pub trait HasQueryGroup<G> {
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fn group_storage(&self);
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}
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pub trait QueryStorageOps<Q>
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where
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Q: Query,
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{
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fn fmt_index(&self, db: &<Q as QueryDb<'_>>::DynDb);
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}
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pub trait QueryDb<'d> {
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type DynDb: HasQueryGroup<Self::Group> + 'd;
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type Group;
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}
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pub trait Query: for<'d> QueryDb<'d> {}
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fn main() {}
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