Loading this module causes panic in interpreter.

This file causes a panic when I try to load it in ghci; but it compiles okay with ghc.

Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
Prelude> :load Submutations.hs 
[1 of 1] Compiling Submutations     ( Submutations.hs, interpreted )
ghc: panic! (the 'impossible' happened)
  (GHC version 6.10.4 for i386-apple-darwin):
        schemeE(AnnCase).my_discr __word 0

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

>

This bug has been observed with 6.10.3 on OS X and 6.10.4 on both OS X and x86_64 Linux.

When the definition of permutations is commented out and replaced with undefined, the problem goes away.

Trac metadata

Trac field	Value
Version	6.10.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
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Loading this module causes panic in interpreter.