Created
September 15, 2012 10:10
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(for use with infinite lists)
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| consM x xs = do x' <- x; return [x'] <> xs | |
| mapWhileM f c (a:as) = do | |
| r <- f a | |
| if c r == True | |
| then return r `consM` (mapWhileM f c as) | |
| else return [] | |
| instance Monoid (IO [String]) where | |
| mempty = return [] | |
| a `mappend` b = do x <- a; y <- b; return (x++y) |
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