Strange ghci :def failure

What is wrong here?

  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 6.0, for Haskell 98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base ... linking ... done.
Prelude> :def code (\ "" -> do { let {getCode acc = do { next <- getLine ; if next == 
":edoc" then return . unwords . reverse $ acc else getCode (next : acc)}} ; getCode [] } )
ghc-6.0: panic! (the `impossible' happened, GHC version 6.0):
        getLinkDeps No iface for [<pkg>]GHCziErr

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