leap n = dv n 400 || dv n 4 && not (dv n 100) where dv x y = mod x y == 0leap' n = False `unl` dv n 4 `unl` dv n 100 `unl` dv n 400 where infixr `unl` unl a b = if b then not a else a dv x y = mod x y == 0
leap n = dv n 400 || dv n 4 && not (dv n 100) where dv x y = mod x y == 0leap' n = False `unl` dv n 4 `unl` dv n 100 `unl` dv n 400 where infixr `unl` unl a b = if b then not a else a dv x y = mod x y == 0
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