#source

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

#bytecode
    
    PUSHFUN fun, 1;
    ASS "nop";
    POP 1;
    JUMP end;
fun:
    PUSHTYP;
    PUSHVAR "None";
    PUSHTYP;
    PUSHTYPTYP;
    EQL;
    JUMPIFNOTANDPOP arg_annot_not_type;
    EQL;
    JUMPIFANDPOP arg_ok;
    ERROR "Bad type for argument 0";
arg_annot_not_type:
    ERROR "Argument 0 type annotation 0 is not a type";
arg_ok:
    ASS "a";
    POP 1;
    PUSHVAR "a";
    RETURN 1;
    RETURN 0;
end:
    EXIT;