bug

There seems to be a mistake in the handling of case, no?

Thanks,

Paul

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

Loading package base ... linking ... done.
Prelude> case "a" of "a" -> True
True
Prelude> case "b" of "b" -> True
True
Prelude> case "ab" of "ab" -> True
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/.


Prelude> case "a" of "ab" -> True
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/.


Prelude> case "ab" of "a" -> True
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/.


Prelude> case "ab" of ('a':'b':[]) -> True
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/.


Prelude> let x = "ab"
Prelude> case x of ('a':'b':[]) -> True
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/.


Prelude>