[GHC] #14154: Some cocktail of features causes GHC panic

[GHC]

#14154: Some cocktail of features causes GHC panic
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"4455c86d1635bfb846e750b21dda36dcee028b5e/ghc"
 4455c86d/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="4455c86d1635bfb846e750b21dda36dcee028b5e"
 Use a well-kinded substitution to instantiate

 In tcDataConPat we were creating an ill-kinded substitution
 -- or at least one that is well kinded only after you have solved
 other equalities.  THat led to a crash, because the instantiated
 data con type was ill-kinded.

 This patch guarantees that the instantiating substitution is
 well-kinded.

 Fixed Trac #14154
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14154#comment:11>
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