[Haskell-cafe] Why does this work: 'instance Num (Show a) where'

Tom Ellis tom-lists-haskell-cafe-2013 at jaguarpaw.co.uk
Tue Nov 4 08:30:18 UTC 2014

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This is accepted by GHC 7.6.3.  Is this a bug?  What does it mean?

    instance Num (Show a) where

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