pub fn marker(&self) -> BytecodeMarker {
        match self.0.as_bytes()[0] {
            val if val == BytecodeMarker::EraVm as u8 => BytecodeMarker::EraVm,
            val if val == BytecodeMarker::Evm as u8 => BytecodeMarker::Evm,
            _ => unreachable!(),
        }
    }
Returns a marker / kind of this bytecode.
core/lib/basic_types/src/bytecode.rs