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

That's a bug. As you surmise, the code is meaningless. It seems to be fixed in 7.8. On Nov 4, 2014, at 3:30 AM, Tom Ellis wrote:

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

instance Num (Show a) where _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe