[Haskell-cafe] case switch covering all possible constructor but still fails

[Nathan Hüsken]

Oh, so obvious. That was it, thanks.

On 04/13/2013 12:08 PM, Daniel Trstenjak wrote:
>
> Hi Nathan,
>
>> DataAlt c | Right tag <- genDataConTag c -> return $ Cond tag
>
> Are you sure, that genDataConTag always returns a 'Right'?
> If it returns a 'Left', than the pattern won't match.
>
>
> Greetings,
> Daniel
>
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