[GHC] #16127: Panic: piResultTys1 in compiler/types/Type.hs:1022:5

[GHC]

#16127: Panic: piResultTys1 in compiler/types/Type.hs:1022:5
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        Reporter:  _deepfire         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.6.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 Could this happen without the `-XPolyKinds` disparity? It sounds like
 "yes". If that's the case, then I agree with your plan.

 If the only way this happens is the `-XPolyKinds` disparity, then I would
 want to think about this other option: Brutally require that an .hs-boot
 file and its regular-module counterpart have exactly the same set of
 extensions enabled. This could be checked very early on, halting with an
 appropriate error message before ever looking at declarations.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16127#comment:10>
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