replace definition of error with errorWithStackTrace

[Francesco Mazzoli]

Note that you can already get this by running with `+RTS -xc -RTS'.

Francesco

On 1 December 2014 at 16:20, John Lato <jwlato at gmail.com> wrote:
> +1 seems clearly better.
>
> On 20:09, Sun, Nov 30, 2014 Mark Wotton <mwotton at gmail.com> wrote:
>>
>> having just spent a day tracking down a really uninformative error in
>> Cabal, I'm all for this.
>>
>> On Mon Dec 01 2014 at 11:08:35 Carter Schonwald
>> <carter.schonwald at gmail.com> wrote:
>>>
>>>
>>> http://hackage.haskell.org/package/base-4.7.0.1/docs/GHC-Stack.html#v:errorWithStackTrace
>>> has been in GHC for for >=1 major version,
>>> and for normal builds, acts just like error, BUT, when an error is thrown
>>> in a profiled build, it appends a stack trace with some basic source
>>> location data to the end of the error message!
>>>
>>> I think this change would benefit many!
>>>
>>> My current understanding is that the DWARF based approach to stack traces
>>> wont make it into  GHC 7.10 , and while this variant would only provide
>>> extra info in profiling builds (and strictly less than the dwarf work), its
>>> something that can definitely be done in a single small patch that could
>>> easily be swapped out for that improved approach once it lands.
>>>
>>>
>>> discussion period: 2 weeks unless theres a clear unanimous agreement to
>>> make the change ASAP, OR if the stack trace error stuff is landing in 7.10
>>> and I'm misinformed!
>>>
>>> cheers
>>> -Carter
>>>
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