// process it next. Because the resulting predicates aren't always
// guaranteed to be a subset of the original type, so we need to store the
// WF args we've computed in a set.
- let mut checked_wf_args = rustc_data_structures::stable_set::FxHashSet::default();
+ let mut checked_wf_args = rustc_data_structures::fx::FxHashSet::default();
let mut wf_args = vec![ty.into()];
let mut implied_bounds = vec![];