Michael Rice wrote:
-- comb is a combinator for sequencing operations that return Maybe comb :: Maybe a -> (a -> Maybe b) -> Maybe b comb Nothing _ = Nothing comb (Just x) f = f x
comb is essentially the same as something in the Prelude: it is just (>>=) specialized to Maybe. (>>=) :: Monad m => m a -> (a -> m b) -> m b
Now what am I misunderstanding in the code below? lst = [('A',65),('B',66),('C',67),('D',68)]
Brandon S. Allbery wrote:
...it defaulted to [(Char,Integer)]. This is a manifestation of the Monomorphism Restriction...
While it may be debatable whether the Monomorphism Restriction is helpful in compiled code, it is unquestionably a major nuisance at the GHCi prompt, for this and other reasons. I highly recommend that you create a .ghci file in your home directory containing the line: :set -XNoMonomorphismRestriction In my opinion, MR should be off by default in GHCi. -Yitz