{"ast_node_type":"variable","tokens":[{"end":28,"kind":"keyword","start":0,"text":"let"}]}
                let in_ret =
                let in_arg = fn_decl.inputs.iter().any(|t| t.hir_id == ty_id);
                    matches!(fn_decl.output, hir::FnRetTy::Return(ty) if ty.hir_id == ty_id);