{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
                let ty = LoweredTy::from_raw(self, path_span, ty);
                    .unwrap_or_else(|guar| Ty::new_error(self.tcx(), guar));
                let result = result.map(|(_, kind, def_id)| (kind, def_id));