fn write_opcode(
op: Opcode,
cfg: Unsigned5Bit,
base_address_bits: Unsigned18Bit,
f: &mut Formatter<'_>,
) -> Result<(), Error>
fn write_opcode(
op: Opcode,
cfg: Unsigned5Bit,
base_address_bits: Unsigned18Bit,
f: &mut Formatter<'_>,
) -> Result<(), Error>