[GHC] #11062: Type families + hs-boot files = panic

[GHC]

#11062: Type families + hs-boot files = panic
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        Reporter:  goldfire          |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:  TypeFamilies
                                     |  hs-boot
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2215
       Wiki Page:                    |
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Comment (by simonpj):

 Another minor advantage of (2) is that we could remove the
 {{{
        ; no_conflict    <- checkForConflicts inst_envs fam_inst
 }}}
 check in `FamINst.addLocalFamInsts`, because inconsistency would be caught
 by the later aggressive check, and would not cause a problem meanwhile.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11062#comment:10>
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