{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"always!(binders.len(Interner)"}]}
                always!(binders.len(Interner) == 0); // quantified where clauses not yet handled
                    .into_value_and_skipped_binders();
                self.push_obligation(predicate.cast(Interner));