[GHC] #11784: panic "hscCmmFile: no_mod" with `-v2 and above

[GHC]

#11784: panic "hscCmmFile: no_mod" with `-v2 and above
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 This is really quite a bad bug sine it hinders one's the ability to debug
 the compiler. We should really make sure this is fixed for 8.2.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11784#comment:2>
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