fn slice_create_writer<'slf, Channels: 'slf + WritableChannels<'slf>>(
slice: &'slf [Layer<Channels>],
headers: &[Header],
) -> AllLayersWriter<Channels::Writer>
fn slice_create_writer<'slf, Channels: 'slf + WritableChannels<'slf>>(
slice: &'slf [Layer<Channels>],
headers: &[Header],
) -> AllLayersWriter<Channels::Writer>