How to using runBuf function in AX

static void THK_runBuf(Args _args)
{
    str myJob = "int myfunc(int i) {return i+7;}";
    ExecutePermission perm;
    ;

    perm = new ExecutePermission();
    if (perm != null)
    {
        perm.assert(); 
        print runBuf(myJob, 42);
        pause;
        CodeAccessPermission::revertAssert();
    }
}