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<sect1>Release notes for version~4.04---7/99
<label id="release-4-04">
<p>
<itemize>
<item> <tt/Weak/ library changes:
<itemize>
<item> Finalise is now spelt finalize in all function names.
<item> <tt/finalize/ now runs the finalizer immediately, and
waits for it to complete before returning.
<item> <tt/mkWeak/ now takes a <tt/Maybe (IO ())/ for the finalizer,
and <tt/mkWeakNoFinalizer/ is removed.
<item> A weak pointer whose key is itself a weak pointer will now do
the right thing.
</itemize>
<item> Changed representation of <tt/Integer/ type to speed up
computations on small integers. The performance of <tt/Integer/ is now
only slightly slower than <tt/Int/ for values between <tt/minBound::Int/
and <tt/maxBound::Int/.
<item> On Win32 platforms, added support for using (and producing) dynamic
link libraries (DLLs) containing ghc-compiled code.
<item> Added @-funbox-strict-fields@ for unboxing/unpacking strict
constructor fields.
<item> GHC now has a license! Check out <tt>fptools/ghc/LICENSE/</tt>.
<item> Added CPR analysis, which reduces allocation by unboxing
function results (thanks to Kevin Glynn <tt><keving@@cs.mu.OZ.AU></tt>).
<item> UsageSP analysis added, but not yet functional.
<item> Added a simple common sub-expression analysis pass.
<item> Implemented update-in-place for certain very restricted cases.
<item> 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.
<item> Added <tt>Concurrent.yield :: IO ()</tt>.
<item> 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.
<item> Unregisterised/unmangled builds now work.
<item> Much performance tuning: GHC 4.04 produces faster code than all
previous compilers.
<item> GHC now defines <tt/__HASKELL98__/ when compiling files with
<tt/-cpp/.
<item> <tt/hppa1.1-hp-hpux/ port reinstated.
<item> New operations for unsafely thawing byte arrays:
<tt/unsafeThaw{Byte,ST,IO}Array/.
<item> <tt/mkdependHS/ now lives in GHC's lib directory, not the
binary directory. It isn't intended to be run standalone, only via
<tt/ghc -M/.
<item> Asynchronous exceptions are now supported (see Section <ref name="The Concurrent Library" id="concurrent-interface">). New operations:
<itemize> <item> <tt/Exception.killThread/ now raises an exception
(<tt/AsyncException.KilledThread/) in the killed thread.
<item> <tt/Exception.raiseInThread/ allows a thread to raise an
exception in another thread.
<item> <tt/Concurrent.myThreadId/ returns the <tt/ThreadId/ of the
calling thread.
<item> Stack overflow results in <tt/AsyncException.StackOverflow/
being raised in the offending thread.
</itemize>
<item> Assertion failures now raise an <tt/AssertionFailed/ exception.
<item> Added simple high-level interface to the Regex library, see
Section <ref name="The RegexString Library" id="RegexString">.
<item> <tt/forkIO/ now handles any uncaught exceptions cleanly.
<item> <tt/integer2Int#/ isn't sign preserving any longer, but modulo
<tt/(maxBound::Int + 1) * 2/.
<item> <tt/-ddump-rdr/ is now called <tt/-ddump-parsed/.
<item> Signal handling with the <tt/Posix/ library now works.
<item> Many, many bugs fixed.
</itemize>
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