[GHC] #5273: error and undefined should print a location

[GHC]

#5273: error and undefined should print a location
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        Reporter:  augustss          |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  low               |        Milestone:  7.6.2
       Component:  Compiler          |          Version:  7.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by MikolajKonarski):

 * difficulty:   => Unknown


Comment:

 While we are at it, adding source position information to Debug.trace & Co
 would be very useful too (how often did you write 'trace "1" ... trace
 "2"', etc.?). This is done (in a hacky way, by passing assert as an
 argument) in the package loch from 2007, together with hacks for 'error'
 and exceptions. BTW, some support for locations in exceptions, without the
 need to profile for stack traces, would be very valuable too. Perhaps
 something can be done cheaply? Even just one random location sometimes?

 This is all needed by people for years, because at least 3 packages
 contain relevant basic hacks (in addition to other stuff):

 http://hackage.haskell.org/package/loch

 http://hackage.haskell.org/package/assert-failure

 http://hackage.haskell.org/package/assert

 plus there are some more that use TH for that. *shudder*

 Thank you in advance!

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5273#comment:5>
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