{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
        // Drop everything except the return argument (if there is one).
        let has_return_arg = matches!(fn_abi.ret.mode, PassMode::Indirect { .. });
        abi_params.truncate(if has_return_arg { 1 } else { 0 });