{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"(Some((hir::def::CtorKind::Fn,"}]}
                        (Some((hir::def::CtorKind::Fn, def_id)), _) => {
                        }
                            let fn_sig = self.tcx.fn_sig(def_id).instantiate_identity();