{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":".unwrap_or_else(|guar|"}]}
                    .unwrap_or_else(|guar| TypeOpOutput {
                    .fully_perform(self.infcx, span)
                        output: Ty::new_error(self.infcx.tcx, guar),