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

Jamie Love jamie.love at aviarc.com.au
Mon Jan 28 17:45:50 EST 2008

Just to clarify, I know it was my mistake, and so I'm not blaming 
Haskell or Ghc. The first few times you realise the compiler isn't a 
magic wand that stops you being silly are the hardest.

Jamie Love wrote:
> 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).


This message has been scanned for viruses and dangerous content 
by MailScanner and is believed to be clean.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.haskell.org/pipermail/haskell-cafe/attachments/20080129/78730d96/attachment.htm

More information about the Haskell-Cafe mailing list