Template variable unbound in rewrite rule (GHC 7.10.1)

I read this bug had been fixed in GHC 7.10, and yet I get this when trying to compile bitmap :

$ cabal install bitmap
Resolving dependencies...
Configuring bitmap-0.0.2...
Building bitmap-0.0.2...
Failed to install bitmap-0.0.2
Build log ( /home/olivier/.cabal/logs/bitmap-0.0.2.log ):
Configuring bitmap-0.0.2...
Building bitmap-0.0.2...
Preprocessing library bitmap-0.0.2...
[ 1 of 10] Compiling Data.Bitmap.Internal ( Data/Bitmap/Internal.hs, dist/build/Data/Bitmap/Internal.o )
[ 2 of 10] Compiling Data.Bitmap.Base ( Data/Bitmap/Base.hs, dist/build/Data/Bitmap/Base.o )
[ 3 of 10] Compiling Data.Bitmap.IO   ( Data/Bitmap/IO.hs, dist/build/Data/Bitmap/IO.o )

Data/Bitmap/IO.hs:1248:1: Warning:
    SPECIALISE pragma for non-overloaded function ‘myPlusPtr’

Data/Bitmap/IO.hs:1249:1: Warning:
    SPECIALISE pragma for non-overloaded function ‘myPlusPtr’
ghc: panic! (the 'impossible' happened)
  (GHC version 7.10.1 for x86_64-unknown-linux):
	Template variable unbound in rewrite rule
  $fPixelComponentFloat3_X2Rc
  [$fPixelComponentFloat3_X2Rc]
  [$fPixelComponentFloat3_X2Rc]
  []
  []

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

cabal: Error: some packages failed to install:
bitmap-0.0.2 failed during the building phase. The exception was:
ExitFailure 1
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.10.1

Trac metadata

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