[GHC] #12216: GHC 8.0.1 panics when compiling JuicyPixels-repa 0.7.1

[GHC]

#12216: GHC 8.0.1 panics when compiling JuicyPixels-repa 0.7.1
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        Reporter:  cgo               |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  duplicate         |             Keywords:
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"393928db9fc35ef8bdeb241c051224a6c4bdf749/ghc"
 393928db/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="393928db9fc35ef8bdeb241c051224a6c4bdf749"
 Fix renamer panic

 This patch fixes Trac #12216 and #12127.  The 'combine' function
 in 'imp_occ_env' in RnNames.filterImports checked for an empty
 field-selector list, which was (a) unnecessary and (b) wrong.

 I've elaborated the comments.

 This does NOT fix #11959 which is related but not the same
 (it concerns bundling of pattern synonyms).
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12216#comment:3>
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