{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"//"}]}
    // Preserving the order of insertion is important here so as not to break UI tests.
    // We use an `IndexSet` to preserve order of insertion.
    let mut predicates: FxIndexSet<(ty::Clause<'_>, Span)> = FxIndexSet::default();