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@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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