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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
| Behalf Of Paul T. Graunke
| Sent: 30 June 2003 16:49
| To: [EMAIL PROTECTED]
| 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
[EMAIL PROTECTED],
| 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
[EMAIL PROTECTED],
| 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
[EMAIL PROTECTED],
| 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
[EMAIL PROTECTED],
| 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
[EMAIL PROTECTED],
| or http://sourceforge.net/projects/ghc/.
|
|
| Prelude>
|
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