Macro bytecodec_try_encode

macro_rules! bytecodec_try_encode {
    ($encoder:expr, $offset:expr, $buf:expr, $eos:expr) => { ... };
    ($encoder:expr, $offset:expr, $buf:expr, $eos:expr, $($track_arg:tt)*) => { ... };
    ($encoder:expr, $offset:expr, $buf:expr, $eos:expr; $($track_arg:tt)*) => { ... };
}

Tries to encode items to the given buffer.

Conceptually, this macro is expanded to the following expression.

if !$encoder.is_idle() {
    $offset += track!($encoder.encode(&mut $buf[$offset..], $eos))?;
    if !$encoder.is_idle() {
        return Ok($offset);
    }
}