{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"ast::FnRetTy::Default(_)"}]}
            ast::FnRetTy::Default(_) => None,
        ast::GenericArgs::Parenthesized(args) => match &args.output {
            ast::FnRetTy::Ty(ret) => Some(ret),