[Haskell-cafe] Data structure containing elements which are instances of the same type class

[Alexander Solla]

On Sat, Aug 11, 2012 at 12:01 PM, Antoine Latter <aslatter at gmail.com> wrote:

> It should be pretty easy to write an adapter function of type "String ->
> (Show a => a)".
>

Not with that type.  Give it a try.

Hint:  what is the extension of the type variable 'a'?  What do you know
about it?  How would you use that to write the function?
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