(using GHC 6.2.1 under Windows XP) I'm trying to use the Sqlite (version 3) dll - see http://www.sqlite.org/ . Marshalling of 32-bit ints and Strings works well, but 64-bit Ints and Doubles fail (I get garbage back from the FF calls) when I compile with "-prof -auto-all". If I compile without profiling, everything works as I expect. When I try to load the compiled (with -prof) object files in GHCi, it fails with this error message: ------------------------ Compiling TestCase ( TestCase.lhs, interpreted ) ghc.exe: panic! (the `impossible' happened, GHC version 6.2.1): ByteCodeFFI.mkMarshalCode_wrk(x86) LI_ Please report it as a compiler bug to glasgow-haskell-bugs@haskell.org, or http://sourceforge.net/projects/ghc/. ------------------------ GHCi works correctly with non-profiled object files. Thanks, Alistair. ----------------------------------------- ***************************************************************** Confidentiality Note: The information contained in this message, and any attachments, may contain confidential and/or privileged material. It is intended solely for the person(s) or entity to which it is addressed. Any review, retransmission, dissemination, or taking of any action in reliance upon this information by persons or entities other than the intended recipient(s) is prohibited. If you received this in error, please contact the sender and delete the material from any computer. *****************************************************************