> Now, obviously, the problem is that fst and snd, being passed in a
> list, needs to be of the same type; this complicates classifying a
> list of type [(Int,Bool)], for instance¹.
I have a similar problem.
Say I have a record:
> data Rec = Rec { a :: Int, b :: Type1, c :: Type2, d :: Type3, ... }
> rec = Rec { a = 1, b = ... }
Now I want to print part of the record. What I would like to do is the
following
> putStrLn $ concatMap show [a,c,d]
!!! bang !!!
So what I actually do is
> putStrLn $ concat [show a, show c, show d]
Works, but a little bit clumsy, especially with long lists.
Is there a nice solution?
Markus
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