[Haskell-cafe] Crash in Data.ByteString.Lazy.hPut

[Jamie Love]

Oh, I see

I wasn't thinking through the code (and I'm still in the honeymoon phase 
with Haskell, thinking it can do no wrong).

Don Stewart wrote:
> jamie.love:
>   
>>    Ah, of course.
>>
>>    Thanks. I removed the hPut and it runs smoothly.  I had forgotten that
>>    haskell chooses the types dynamically.
>>
>>    Shouldn't haskell pick up that there is no 'mod' for Word8?  I mean,
>>    shouldn't I get a nicer error message?
>>     
>
> Well, it inferred Word8 for your generated values, so 256 overflowed to 0.
> Stating the expected type here would prevent that. (And is why mandatory 
> top level declarations are good -- they can prevent bugs caused by 
> an unexpected type being inferred).
>
>
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-- 
Jamie Love
Senior Consultant
Aviarc Australia
Mobile: +61 400 548 048



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