On 25 August 2013 19:48, Henning Thielemann
Am 24.08.2013 19:52, schrieb Edward Kmett:
I would like to replace this instance with
instance a ~ Char => IsString [a] where fromString = id
Your complaint proves my concerns about those FlexibleInstances. The best instance is a Haskell 98 instance:
class IsCharList a where fromCharList :: [a] -> String
instance IsCharList Char where fromCharList = id
instance IsCharList a => IsString [a] where fromString = fromCharList
+1 to Henning's proposal.
This is both the most flexible solution and it is portable.
http://www.haskell.org/haskellwiki/List_instance
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