Back to high school time, I use it for turn based battle system for a game. I have two mutually (tail-)recursive procedures where one is the player movement decision (full with prompts) while the other is the enemy's (some AI calculation takes the decision). The battle could start ambushed (enemy first) or preemptive strike (player first). Because of this, the first procedure to call could be either of the two, and because both are mutually recursive, one needs to be declared forward.
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