[Haskell-beginners] GHCi bug?
ozgurakgun at gmail.com
Tue Nov 16 06:44:38 EST 2010
On 16 November 2010 11:39, Russ Abbott <russ.abbott at gmail.com> wrote:
> I'm not sure what you are saying here. Are you saying that it's not a bug
> that GHCi went into a coma when I file was loaded and a prompt entered?
> -- Russ*
> On Tue, Nov 16, 2010 at 3:34 AM, Ozgur Akgun <ozgurakgun at gmail.com> wrote:
>> On 16 November 2010 05:12, Russ Abbott <russ.abbott at gmail.com> wrote:
>>> I know the code isn't correct. My point is that the compiler didn't
>>> complain when the code was loaded, and the interpreter died when it was
>>> executed. That shouldn't happen.
>>> -- Russ*
>> It would be *cool* for GHC to make an analysis about the instance methods
>> of a type class, and their default implementations to find the minimal
>> subset of methods you have to implement to get a valid (for some definition
>> of valid) instance declaration. But it doesn't do such a thing. And it is
>> not an easy task.
>> GHC only warns you if you do not implement a method which doesn't have a
>> default implementation. In your example, this is not the case.
>> Ozgur Akgun
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