pub trait ChildExt {
// Required method
fn spawn_async<'life0, 'async_trait>(
&'life0 mut self,
stdin: Option<Vec<u8>>,
timeout: Option<Duration>,
max_size: Option<usize>,
) -> Pin<Box<dyn Future<Output = Result<SpawnAsyncOutput>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
}