ghc-7.10.1 panics when compiling singletons-1.1.2.1

Not sure if this has been fixed in newer versions or not, but:

[39 of 45] Compiling Data.Singletons.Prelude.List ( src/Data/Singletons/Prelude/List.hs, dist/build/Data/Singletons/Prelude/List.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 7.10.1 for x86_64-apple-darwin):
	Template variable unbound in rewrite rule
  n_X2iZh
  [a_a2gBn, t_a2gBo, n_a2iB7, ipv_s2szc, ipv_s2szd, sc_s2tXD,
   sc_s2tXF, sc_s2tXG, sg_s2tXH]
  [a_X2gZv, t_X2gZx, n_X2iZh, ipv_X2sXn, ipv_X2sXp, sc_X2ulQ,
   sc_X2ulT, sc_X2ulV, sg_X2ulX]
  [TYPE a_a2gBn, TYPE t_a2gBo,
   TYPE Let1627878522XsSym4 t_a2gBo n_a2iB7 ipv_s2szc ipv_s2szd,
   sc_s2tXD,
   (SCons
      @ a_a2gBn
      @ (ipv_s2szc : ipv_s2szd)
      @ ipv_s2szc
      @ ipv_s2szd
      @~ <ipv_s2szc : ipv_s2szd>_N
      sc_s2tXF
      sc_s2tXG)
   `cast` (sg_s2tXH
           :: R:Sing[]z (ipv_s2szc : ipv_s2szd)
              ~R# Sing (Apply (Apply (:$) ipv_s2szc) ipv_s2szd))]
  [TYPE a_a2gBn, TYPE t_a2gBo,
   TYPE Let1627878522XsSym4 t_a2gBo ipv_s2szc ipv_X2sQZ ipv_X2sR1,
   sc_s2tXD,
   (SCons
      @ a_a2gBn
      @ (ipv_X2sQZ : ipv_X2sR1)
      @ ipv_X2sQZ
      @ ipv_X2sR1
      @~ <ipv_X2sQZ : ipv_X2sR1>_N
      ipv_s2szf
      ipv_s2szg)
   `cast` (Sub (Sym (TFCo:R:Sing[]z[0] <a_a2gBn>_N)) (Sym
                                                        (TFCo:R:Apply[][]:$$l0[0]
                                                           <a_a2gBn>_N <ipv_X2sR1>_N <ipv_X2sQZ>_N)
                                                      ; (Apply
                                                           (Sym
                                                              (TFCo:R:Apply(->)k:$l0[0]
                                                                 <a_a2gBn>_N <ipv_X2sQZ>_N))
                                                           <ipv_X2sR1>_N)_N)
           :: R:Sing[]z (ipv_X2sQZ :$$$ ipv_X2sR1)
              ~R# Sing (Apply (Apply (:$) ipv_X2sQZ) ipv_X2sR1))]

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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