#source

    fun nop(a: None) {
        return a;
    }

#bytecode
    
    PUSHFUN fun, 1;
    JUMP end;
fun:
    PUSHVAR "None";
    CHECKTYPE 0, "a";
    ASS "a";
    POP 1;
    PUSHVAR "a";
    RETURN 1;
    RETURN 0;
end:
    ASS "nop";
    POP 1;
    EXIT;