[GHC] #14911: Offer a way to augment call stacks

[GHC]

#14911: Offer a way to augment call stacks
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Core Libraries    |              Version:  8.4.1
      Resolution:                    |             Keywords:  CallStacks
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by dfeuer):

 Another problem, arguably bigger: if an exception occurs when forcing a
 stack message, that could be handled gracefully by `renderStack` (in
 `base`), but not properly elsewhere.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14911#comment:10>
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