compiler bug in ghc-6.4 (building a class declaration with TH)

This is command and output:

> ghc -fth -ddump-splices --make TestBuffers.hs
Chasing modules from: TestBuffers.hs
Compiling Buffers          ( ./Buffers.hs, ./Buffers.o )
Compiling Main             ( TestBuffers.hs, TestBuffers.o )
Loading package base-1.0 ... linking ... done.
Loading package haskell98-1.0 ... linking ... done.
Loading package template-haskell-1.0 ... linking ... done.
TestBuffers.hs:1:0:
    TestBuffers.hs:1:0: Splicing declarations
        mkBufferClasses 12
      ======>
        class HasZero f where { zero :: a; emptyBag }
        class HasOne f where {ghc-6.4: panic! (the `impossible' 
happened, GHC version 6.4):
        hsSyn/Convert.lhs:(339,8)-(350,91): Non-exhaustive patterns in 
function trans


Please report it as a compiler bug to glasgow-haskell-bugs@xxxxxxxxxxx,
or http://sourceforge.net/projects/ghc/.

I attached the two (short) source files.

Ben

Buffers.hs
Description: Text document

TestBuffers.hs
Description: Text document

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