[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 gridaphobe):

 It looks like things are a bit more complicated than we thought. Judging
 by

 https://github.com/ghc/ghc/blob/master/compiler/iface/MkIface.hs#L219

 and

 https://github.com/ghc/ghc/blob/master/compiler/iface/MkIface.hs#L425

 ghc already filters out wired-in names during fingerprinting.

 In fact, the real problem is that the `GHC.Stack.Types.CallStack` Name
 that triggers the exception '''isn't''' wired-in, which is completely
 bogus.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11331#comment:8>
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