[Haskell-cafe] Help debugging code broken after upgrading debian to GHC 6.12: "invalid argument"

Brandon Simmons brandon.m.simmons at gmail.com
Sat May 15 09:18:28 EDT 2010

>On May 14, 2010, at 20:24 , Brandon Simmons wrote:
>> The other baffling thing is this: if the debugging line 426 is
>> uncommented, then even running:
>>    $> runghc Befunge.hs --quiet mycology.b98
>> ...will fail. But all we're doing is a call to `putStr`! Why would
>> that trigger an error?! Maybe there was a bug in my code that was
> GHC 6.12's runtime handles input and output encoding, instead of
> simply truncating Chars; my guess is it's locale-related.  And sure
> enough, I see several non-ASCII characters in mycology.b98 which are
> likely to do the wrong thing if the runtime doesn't know which
> character set to use.

Thanks, that makes a lot of sense. Is there something I can read to
enlighten myself as to how I would go about getting my program to be
liberal about non-ascii characters in a file?

Also, I noticed yesterday that

    $> cabal list --installed

shows the 'old-locale' package:

    * old-locale
        Synopsis: locale library
        Latest version available:
        Latest version installed:
        License:  BSD3

I'm not sure if that could be part of the issue, or whether that is normal.

Thanks again,
Brandon Simmons

> --
> brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
> system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
> electrical and computer engineering, carnegie mellon university    KF8NH

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