[GHC] #11331: panic! TEST=tc198: lookupVers2 GHC.Stack.Types CallStack

[GHC]

#11331: panic! TEST=tc198: lookupVers2 GHC.Stack.Types CallStack
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        Reporter:  thomie            |                Owner:  gridaphobe
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
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 goldfire):

 Replying to [comment:4 gridaphobe]:

 > (By the way, how ''did'' you figure out what was triggering the load?)

 Erm... I used this brand new feature called implicit call stacks to trace
 back who was making the calls to load `GHC.Stack.Types` in the successful
 case. It's a bit odd how useful the feature was in debugging its own
 implementation.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11331#comment:6>
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