{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"self.sig_of_closure(body,"}]}
            self.sig_of_closure(body, ret_type, arg_types, closure_kind, expected_sig);
        let ClosureSignature { expected_sig: bound_sig, ret_ty: body_ret_ty } =
        let bound_sig = self.normalize_associated_types_in(bound_sig);