Infinite loop in community puzzles?

I thought about making a puzzle which would require the player to have feedback about its previous output, so it requires an infinite loop.
But it means that defining input/expected output is not sufficient : I should define a validator program that tests the player output and gives it new input.
Will it be possible in a near future?

In the future I hope so, in the near future, probably not. We are quite busy on other features right now.

Ok thank you!