{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"for"}]}
    for (idx, (param_ty, param)) in inputs_fn.chain(maybe_va_list).zip(body.params).enumerate() {
    let inputs_fn = fn_sig.inputs().iter().copied();
        // We checked the root's signature during wfcheck, but not the child.