pub fn decode(
  in: TokenAST,
  decoder: Decoder(a),
) -> Result(a, List(DecodeError))

pub fn encode(in: TokenAST) -> Result(BitArray, EncoderError)

pub fn parse(in: String) -> Result(TokenAST, DecoderError)

pub fn parse_byte(in: BitArray) -> Result(TokenAST, DecoderError)