Finalise is now spelt finalize in all function names. A weak pointer whose key is itself a weak pointer will now do the right thing. Changed representation of On Win32 platforms, added support for using (and producing) dynamic link libraries (DLLs) containing ghc-compiled code. Added @-funbox-strict-fields@ for unboxing/unpacking strict constructor fields. GHC now has a license! Check out fptools/ghc/LICENSE/. Added CPR analysis, which reduces allocation by unboxing function results (thanks to Kevin Glynn <keving@@cs.mu.OZ.AU>). UsageSP analysis added, but not yet functional. Added a simple common sub-expression analysis pass. Implemented update-in-place for certain very restricted cases. Replaced GHC's old and worn yacc/lex parser with a new one based on Happy. Fixed several Haskell 98 non-conformance issues in the process. Added Concurrent.yield :: IO (). Added RULES pragms - transformation rules for Haskell source. This is used for list fusion: now intermediate lists between map, foldr, list comprehensions are removed automatically. Unregisterised/unmangled builds now work. Much performance tuning: GHC 4.04 produces faster code than all previous compilers. GHC now defines New operations for unsafely thawing byte arrays: Asynchronous exceptions are now supported (see Section ). New operations: Stack overflow results in Assertion failures now raise an Added simple high-level interface to the Regex library, see Section . Signal handling with the Many, many bugs fixed.