[GHC] #8120: ghc: panic! (the 'impossible' happened)

[GHC]

#8120: ghc: panic! (the 'impossible' happened)
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        Reporter:  EyalLotem         |            Owner:
            Type:  bug               |           Status:  closed
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:  duplicate         |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by monoidal):

 * status:  new => closed
 * resolution:   => duplicate


Comment:

 You can trigger the bug with `f :: a -> b; f x = undefined >>= l x` or
 more simply `f = l undefined undefined`.

 It's a duplicate of #7920/#7368 (search Trac for "kindFunResult" for
 more), fixed in 7.7 but it was left unfixed in 7.6.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8120#comment:2>
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