[Haskell-cafe] A point in favour of -XOverlappingInstances (and -XTypeSynonymInstances)

[Achim Schneider]

Token.hs:103:15:
    Overlapping instances for Show (SourcePos, Tok)
      arising from a use of `anyToken' at Token.hs:103:15-22
    Matching instances:
      instance (Show a, Show b) => Show (a, b) -- Defined in GHC.Show
      instance [overlap ok] Show Token
        -- Defined at Token.hs:(39,0)-(40,23)

I was just trying _not_ to show the a of (a,b)

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