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+<sect1 id="release-4-07">
+ <title>Release notes for version 4.07 (May 2000)</title>
+
+ <sect2>
+ <title>User-visible compiler changes</title>
+
+ <itemizedlist>
+ <listitem>
+ <para>New profiling subsystem, based on cost-centre stacks.
+ See <xref linkend="profiling">.</para>
+ </listitem>
+
+ <listitem>
+ <para>The x86 native code generator has been reworked
+ considerably, and now works reliably. Using the NCG rather
+ than compiling via C reduces compilation times by roughly a
+ half while having minimal effect on the run-time of the
+ compiled program (about 2-4% slower, worse for floating-point
+ intensive programs).</para>
+
+ <para>Add the <option>-fasm-x86</option> flag to GHC's command
+ line to enable it.</para>
+ </listitem>
+
+ <listitem>
+ <para>Implicit parameters.</para>
+ </listitem>
+
+ <listitem>
+ <para>Functional dependencies.</para>
+ </listitem>
+
+ <listitem>
+ <para>New <literal>DEPRECATED</literal> pragma for marking
+ outdated interfaces as deprecated.</para>
+ </listitem>
+
+ <listitem>
+ <para>New flag: <option>-fdump-minimal-imports</option>, which
+ dumps a file <literal>M.imports</literal> that contains the
+ (allegedly) minimal bunch of imports needed by the current
+ module.</para>
+ </listitem>
+
+ <listitem>
+ <para>New “package” system for libraries. See
+ <xref linkend="packages"> for the details.</para>
+ </listitem>
+
+ <listitem>
+ <para>The long-standing bug that caused some programs which
+ used <link linkend="trace"><literal>trace</literal></link> to
+ exit with a deadlock error has been fixed.</para>
+ </listitem>
+
+ <listitem>
+ <para>Trying to put into a full <link
+ linkend="sec-MVars"><literal>MVar</literal></link> will now
+ raise a <link
+ linkend="PutFullMVar"><literal>PutFullMVar</literal></link>
+ exception.</para>
+ </listitem>
+
+ <listitem>
+ <para>If a thread is about to be garbage collected, because it
+ is waiting on an <literal>MVar</literal> that no other thread
+ has access to, then it will now be sent the <link
+ linkend="BlockedOnDeadMVar"><literal>BlockedOnDeadMVar</literal></link>
+ exception.</para>
+ </listitem>
+
+ <listitem>
+ <para>A thread that is found to be blocked against itself
+ (i.e. is black holed) is now sent a
+ <literal>NonTermination</literal> exception.</para>
+ </listitem>
+
+ <listitem>
+ <para>Operations which may <emphasis>block</emphasis>, such as
+ <literal>takeMVar</literal>, <literal>raiseInThread</literal>,
+ and several I/O operations, may now receive asynchronous
+ exceptions even in the scope of a
+ <literal>blockAsyncExceptions</literal>. These are called
+ <firstterm>interruptible</firstterm> operations. See <xref
+ linkend="interruptible-operations"> for more details.</para>
+ </listitem>
+
+ <listitem>
+ <para>Result type signatures now work.</para>
+ </listitem>
+
+ <listitem>
+ <para>A truckload of bugfixes.</para>
+ </listitem>
+
+ </itemizedlist>
+ </sect2>
+
+ <sect2>
+ <title>User-visible library changes</title>
+
+ <itemizedlist>
+ <listitem>
+ <para>FFI.</para>
+ </listitem>
+
+ <listitem>
+ <para>HaXml, a library for parsing and generating XML, has
+ been added to the <literal>text</literal> package (<xref
+ linkend="sec-haxml">).</para>
+ </listitem>
+
+ <listitem>
+ <para>The <literal>QuickCheck</literal> library for performing
+ functional testing has been added to the
+ <literal>util</literal> package.</para>
+ </listitem>
+
+ <listitem>
+ <para>Two new experimental interfaces to arrays:
+ <literal>IArray</literal> for immutable arrays (<xref
+ linkend="sec-iarray">), and <literal>MArray</literal> for
+ mutable arrays (<xref linkend="sec-marray">).</para>
+
+ <para>Comments on these interfaces are welcome; eventually
+ we'd like them to replace <literal>ByteArray</literal>,
+ <literal>STArray</literal> and
+ <literal>IOArray</literal>.</para>
+ </listitem>
+
+ <listitem>
+ <para>New function: <link
+ linkend="tryTakeMVar"><literal>tryTakeMVar</literal></link>.</para>
+ </listitem>
+
+ <listitem>
+ <para><literal>MutableArray</literal> has gone away, use
+ <literal>STArray</literal> (see <xref linkend="sec-ST">)
+ instead.</para>
+ </listitem>
+
+ <listitem>
+ <para><literal>hPutBuf</literal>,
+ <literal>hPutBufBA</literal>, <literal>hGetBuf</literal>, and
+ <literal>hGetBufBA</literal>, have been renamed to
+ <literal>hPutBufFull</literal>,
+ <literal>hPutBufBAFull</literal>,
+ <literal>hGetBufFull</literal>, and
+ <literal>hGetBufBAFull</literal>. Functions with the old
+ names still exist, but have slightly different semantics. See
+ <xref linkend="sec-bulk-transfers"> for more details.</para>
+ </listitem>
+ </itemizedlist>
+ </sect2>
+
+ <sect2>
+ <title>Internal changes</title>
+
+ <itemizedlist>
+ <listitem>
+ <para><literal>Con</literal> is gone; the
+ <literal>CoreExpr</literal> type is simpler.</para>
+ </listitem>
+
+ <listitem>
+ <para><literal>NoRepLits</literal> have gone.</para>
+ </listitem>
+
+ <listitem>
+ <para>Better usage info in interface files, which means less
+ recompilation.</para>
+ </listitem>
+
+ <listitem>
+ <para>CCall primop is tidied up.</para>
+ </listitem>
+
+ <listitem>
+ <para>Constant folding now done by Rules.</para>
+ </listitem>
+
+ <listitem>
+ <para>Lots of hackery in the simplifier.</para>
+ </listitem>
+
+ <listitem>
+ <para>Improvements in CPR and strictness analysis.</para>
+ </listitem>
+
+ </itemizedlist>
+
+ </sect2>
+
+</sect1>
+
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