And without its presence unless you are able to demonstrate doing otherwise. Unless, of course, you wish to change your definition.
I see the problem.
"You will do what you will do" is a meaningless tautology without any truth value. Why? because it assume that what I will do is already true, and it is not. What I will do is undefined, because I have not yet done it, thus to say that I will do something that is undefined isn't valid.
Now, if we take "will" to mean what I intend to do, then it's another story.
If we put my intentionality into this statement, I've already taken and passed the test. When I made my first post, I expressed an intention to use "superfluous" in my next post. Thus, "What I will do" = use "superfluous."
However, between typing that statement and actually making the post "What I will do" changed, because I am free to choose otherwise. Thus, "What I will do" became ~ use "superfluous." And thus I did otherwise.
This exposes the equivocation in your argument, because you go back and forth between "will" meaning future, and "will" meaning what I intend. When we nail this down, either it's totally meaningless, or demonstrates that what I intend can change, unlike exhaustive and definite foreknowledge.