#source

    fun add(a, b) {
        return a + b;
    }

#bytecode
    
    PUSHFUN fun, 2;
    ASS "add";
    POP 1;
    JUMP end;
fun:
    ASS "b";
    POP 1;
    ASS "a";
    POP 1;
    PUSHVAR "a";
    PUSHVAR "b";
    ADD;
    RETURN 1;
    RETURN 0;
end:
    EXIT;