{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"ty::Ref(_,"}]}
                        ty::Ref(_, _, hir::Mutability::Mut) => "&mut ",
                    match self.tcx.fn_sig(m.def_id).skip_binder().input(0).skip_binder().kind() {
                        ty::Ref(_, _, _) => "&",