[GHC] #14270: GHC HEAD's ghc-stage1 panics on Data.Typeable.Internal

[GHC]

#14270: GHC HEAD's ghc-stage1 panics on Data.Typeable.Internal
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14236            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bgamari):

 The rule in question is,
 {{{
 RULES: "SC:mkTrApp0"
            forall (sc_s7Wy
                      :: TypeRep
                           (b_a44F |> cobox_a3RZ ; Sym cobox_a3S9 (Sym (Coh
 <b_a3RY>_N
 (Nth:2
 (Sym cobox_a3S8))) ; Sym (Coh (Sym (Coh <b_a3RY>_N
 (Nth:2
 (Sym cobox_a3S8))))
 (Nth:2
 (Sym cobox_a3S8))))))
                   (sc_s7Wv :: Word#)
                   (sc_s7Ww :: Word#).
              mkTrApp_XkG @ (TYPE
                               (b_a3RY |> Nth:2
                                              (Sym cobox_a3S8)))
                          @ (TYPE
                               (b_X42a |> Nth:2
                                              (Sym cobox_X42x))
                             -> *)
                          @ (->)
                          @ (b_a44F |> Sym (cobox_a3S9 (Coh (Sym (Coh
 <b_a3RY>_N
 (Nth:2
 (Sym cobox_a3S8))))
                                                            (Nth:2
                                                                 (Sym
 cobox_a3S8)) ; Coh <b_a3RY>_N
 (Nth:2
 (Sym cobox_a3S8))) ; Sym cobox_a3RZ))
                          (Data.Typeable.Internal.TrTyCon
                             @ (TYPE
                                  (b_a3RY |> Nth:2
                                                 (Sym cobox_a3S8))
                                -> TYPE
                                     (b_X42a |> Nth:2
                                                    (Sym cobox_X42x))
                                -> *)
                             @ (->)
                             sc_s7Wv
                             sc_s7Ww
                             GHC.Types.$tc(->)
                             kind_vars_X37r)
                          sc_s7Wy
              = $smkTrApp_s7Wz sc_s7Wy sc_s7Wv sc_s7Ww]

 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14270#comment:9>
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