{"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"self.infcx.tcx.fn_sig(def_id).instantiate_identity().skip_binder()"}]}
                            self.infcx.tcx.fn_sig(def_id).instantiate_identity().skip_binder()
                        && let sig =
                        && let Some(arg_ty) = sig.inputs().get(pos + offset)