On: How to shoot yourself in the foot in any programmi...

[jerf]

Excellent. I also would have accepted

    Violence.hs:5:35:
        No instance for (Shootable BodyPart) arising from a use of 'shoot'
        Possible fix: add an instance declaration for (Shootable BodyPart)
        In the expression: shoot $ user ^. foot
        In an equation for 'violence': violence user = shoot $ user ^. foot

[DanWaterworth → jerf]

You should abstract this; you realize bullets are group actions on the set of feet, right?

Edit: Sorry, not group actions, monoid actions. Group actions would mean there was some kind of inverse bullet. Also note that bullets aren't commutative.