nested: &mut Vec<PredicateObligation<'tcx>>,
) {
let tcx = selcx.tcx();
- for predicate in tcx
+ let own = tcx
.predicates_of(obligation.predicate.item_def_id)
- .instantiate_own(tcx, obligation.predicate.substs)
- .predicates
- {
+ .instantiate_own(tcx, obligation.predicate.substs);
+ for (predicate, span) in std::iter::zip(own.predicates, own.spans) {
let normalized = normalize_with_depth_to(
selcx,
obligation.param_env,
predicate,
nested,
);
+
+ let nested_cause = if matches!(
+ obligation.cause.code(),
+ super::CompareImplItemObligation { .. }
+ | super::CheckAssociatedTypeBounds { .. }
+ | super::AscribeUserTypeProvePredicate(..)
+ ) {
+ obligation.cause.clone()
+ } else if span.is_dummy() {
+ ObligationCause::new(
+ obligation.cause.span,
+ obligation.cause.body_id,
+ super::ItemObligation(obligation.predicate.item_def_id),
+ )
+ } else {
+ ObligationCause::new(
+ obligation.cause.span,
+ obligation.cause.body_id,
+ super::BindingObligation(obligation.predicate.item_def_id, span),
+ )
+ };
nested.push(Obligation::with_depth(
tcx,
- obligation.cause.clone(),
+ nested_cause,
obligation.recursion_depth + 1,
obligation.param_env,
normalized,