patch applied (ghc): Add assertion for arity match (checks Trac #2844)

[Simon Marlow]

Thomas Schilling wrote:
> My validate always has process008 failing (missing printf).  The rest is fine.

And ironically, in the logs we find:

Thu Oct  2 00:23:39 GMT Daylight Time 2008  Ian Lynagh <igloo at earth.li>
   * Use printf rather than echo for the process008 test
   It doesn't work on Windows for me otherwise

It works for me with echo (on Cygwin).  Ian - what's the problem here? 
Presumably MSYS doesn't come with printf by default, so we need to fix this.

Cheers,
	Simon


> 2008/12/10 Simon Marlow <marlowsd at gmail.com>:
>> Simon Marlow wrote:
>>> Simon Peyton-Jones wrote:
>>>> | Hooray for the testsuite and validate: out of 2000+ tests, there was
>>>> | exactly 1 (ONE) that demonstrated this bug, and it was in a test for
>>>> the
>>>> | System.Random library of all things.  This serves as a reminder to all
>>>> of
>>>> | us: any test failure should be treated as suspicious, even if it
>>>> doesn't
>>>> | look at all related to something you changed, and this is exactly why
>>>> we
>>>> | have to keep validate clean.  I am now a fully paid-up validate
>>>> convert!
>>>>
>>>> Indeed!
>>>>
>>>> On Windows (MSYS) I get several failures that I'm pretty sure have been
>>>> there for a while.  They seem to relate to things like 'printf' not
>>>> existing.  That makes it harder to interpret a Windows validate run.
>>>>
>>>> I wonder if someone (Neil? Ian?) might investigate?
>>> I see some, but not all of those failures on our buildbots, I'll
>>> investigate.  We had zero failures a few days ago, so I think these are new.
>> Well, on closer inspection we currently have zero failures on the Cygwin
>> buildbots, for the fast/validate testsuite.  I don't have an MSYS build set
>> up, so could someone else try with that?
>>
>> Cheers,
>>        Simon
>>
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