{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
        let existing_bound_vars = self.rbv.late_bound_vars.get_mut(&hir_id.local_id).unwrap();
        // `tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.rs`.
        let existing_bound_vars_saved = existing_bound_vars.clone();