Function tokio::io::util::read_to_string::read_to_string_internal

fn read_to_string_internal<R: AsyncRead + ?Sized>(
    reader: Pin<&mut R>,
    output: &mut String,
    buf: &mut VecWithInitialized<Vec<u8>>,
    read: &mut usize,
    cx: &mut Context<'_>,
) -> Poll<Result<usize>>