interpretBCO: unknown or unimplemented opcode 61764

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I just hit an internal compiler error:

$ ghci blatt2a6.hs 
   ___         ___ _
  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 6.6, for Haskell 98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base ... linking ... done.
[1 of 1] Compiling Main             ( blatt2a6.hs, interpreted )
Ok, modules loaded: Main.
*Main> pretty startn merk1
<interactive>: internal error: interpretBCO: unknown or unimplemented opcode 61764
    (GHC version 6.6 for i386_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Abgebrochen

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Code that causes the error.

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Very similar code that does not cause the problem.

[thorkilnaur]

Thanks a lot for this report. It seems that this is a duplicate of #1013, so I will close this ticket. For additional details, see  http://www.haskell.org/pipermail/glasgow-haskell-bugs/2007-March/008800.html: The error is present in GHC 6.6, but should be fixed in GHC 6.6.1.

Best regards Thorkil