{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
        let typeck_root_def_id = tcx.typeck_root_def_id(self.body.source.def_id());
        // Now equate closure args to regions inherited from `typeck_root_def_id`. Fixes #98589.
        let typeck_root_args = ty::GenericArgs::identity_for_item(tcx, typeck_root_def_id);