Hi, the bug fixer may have contacted you separately, but for the benefit of the mailing list and/or you, this one has now been fixed (i.e., deriving empty datatypes is not permitted). Thanks for reporting it.
--sigbjorn ----- Original Message ----- From: "Hal Daume III" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, November 30, 2001 09:24 Subject: GHC bug > Prelude> :reload > Compiling XBar ( /nfs/isd/hdaume/projects/XBar/XBar.hs, > interpreted ) > ghc-5.02.1: panic! (the `impossible' happened, GHC version 5.02.1): > TcGenDeriv:mk_FunMonoBind > > Please report it as a compiler bug to [EMAIL PROTECTED], > or http://sourceforge.net/projects/ghc/. > > This happened immediately after I change line 35 in the attached program > from: > > data DummyHead > > to > > data DummyHead deriving (Show, Eq) > > I wasn't sure whether it would allow me to derive instances on a datatype > with no constructors...I know this was recently added and I guess all the > bugs haven't been worked out. I'm using the solaris build of ghc. > > -- > Hal Daume III > > "Computer science is no more about computers | [EMAIL PROTECTED] > than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume > _______________________________________________ Glasgow-haskell-bugs mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
