[GHC] #7175: Panic when wrongly using a type family as return types for GADTs

[GHC]

#7175: Panic when wrongly using a type family as return types for GADTs
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        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:  7.6.1
       Component:  Compiler          |                 Version:  7.6.1-rc1
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Compile-time      |               Test Case:
  crash                              |  typecheck/should_fail/T7175
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by goldfire):

 Hooray! Hooray! Hooray!

 This fix is quite straightforward, of course, but somehow this dark corner
 has lurked a long time. Thanks. I no longer don armor and surround myself
 in a cloud of fear and loathing every time I need to think about editing
 `rejigConRes`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7175#comment:5>
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