RE: bug

Yes, it's a bug.  Check out:
        
http://www.haskell.org/pipermail/glasgow-haskell-bugs/2003-June/003330.h
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| -----Original Message-----
| From: glasgow-haskell-bugs-admin@xxxxxxxxxxx
[mailto:glasgow-haskell-bugs-admin@xxxxxxxxxxx] On
| Behalf Of Paul T. Graunke
| Sent: 30 June 2003 16:49
| To: glasgow-haskell-bugs@xxxxxxxxxxx
| Subject: 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>
| 
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