Function tokio::io::util::read_to_end::poll_read_to_end

fn poll_read_to_end<V: VecU8, R: AsyncRead + ?Sized>(
    buf: &mut VecWithInitialized<V>,
    read: Pin<&mut R>,
    cx: &mut Context<'_>,
) -> Poll<Result<usize>>

Tries to read from the provided AsyncRead.

The length of the buffer is increased by the number of bytes read.