debug!("subst_and_check_impossible_predicates(key={:?})", key);
let mut predicates = tcx.predicates_of(key.0).instantiate(tcx, key.1).predicates;
- predicates.retain(|predicate| !predicate.definitely_needs_subst(tcx));
+ predicates.retain(|predicate| !predicate.needs_subst());
let result = impossible_predicates(tcx, predicates);
debug!("subst_and_check_impossible_predicates(key={:?}) = {:?}", key, result);