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Peaker/test.hs

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Created June 4, 2012 00:35
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Illegal instance declaration, flexible instances?
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test.hs
{-# LANGUAGE TypeFamilies #-}
class Collection c where
type Element c
insert :: Element c -> c -> c
instance Collection [a] where
type Element [a] = a
insert = (:)
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Peaker commented Jun 4, 2012

{-# LANGUAGE MultiParamTypeClasses #-}
class Collection c where
type Element c
insert :: Element c -> c -> c

instance Collection [a] where
type Element [a] = a
insert = (:)

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