[GHC] #9186: GHC panic when compiling compdata

[GHC]

#9186: GHC panic when compiling compdata
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              Reporter:  snoyberg    |            Owner:  simonmar
                  Type:  bug         |           Status:  new
              Priority:  high        |        Milestone:  7.8.4
             Component:  Compiler    |          Version:  7.8.2
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:  #8935
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by trommler):

 Replying to [comment:23 trommler]:
 > Replying to [comment:13 rwbarton]:
 > > OK, this is quite annoying, it consistently fails when I do `cabal
 install -v`, but consistently succeeds when I do `cabal install -v3`!
 > So with more verbose output you could build compdata. That you could do
 so consistently looks promising. Perhaps I missed laziness somewhere in my
 patch for #8935.
 >
 > I'll go check.
 I rebased the patch for #8935 and cannot reproduce the issue for compdata
 version 0.8.1.0 and 0.9.
 I also built Haskell Platform
 [https://build.opensuse.org/project/show/devel:languages:haskell:platform]
 and pandoc
 [https://build.opensuse.org/project/show/devel:languages:haskell:pandoc]
 on OBS and did not see the issue.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9186#comment:24>
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