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<?xml version="1.0" encoding="iso-8859-1"?>
<sect1 id="release-7-10-1">
<title>Release notes for version 7.10.1</title>
<para>
The significant changes to the various parts of the compiler are listed
in the following sections. There have also been numerous bug fixes and
performance improvements over the 7.8 branch.
</para>
<sect2>
<title>Highlights</title>
<para>
The highlights, since the 7.8 branch, are:
</para>
<itemizedlist>
<listitem>
<para>
TODO FIXME
</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>Full details</title>
<sect3>
<title>Language</title>
<itemizedlist>
<listitem>
<para>
Added support for <link linkend="binary-literals">binary integer literals</link>
</para>
</listitem>
<listitem>
<para>
Simplified rules for implicit quantification. In previous versions of GHC,
it was possible to use the <literal>=></literal> arrow
to quantify over type variables in <literal>data</literal> and
<literal>type</literal> declarations without a
<literal>forall</literal> quantifier. For example,
<literal>data Fun = Fun (Ord a => a -> b)</literal> was identical to
<literal>data Fun = Fun (forall a b. Ord a => a -> b)</literal>, while
<literal>data Fun = Fun (a -> b)</literal> caused a not-in-scope error.
This implicit quantification is now deprecated, and variables
in higher-rank constructors should be quantified with <literal>forall</literal>
regardless of whether a class context is present or not.
GHC 7.10 raises a warning (controlled by
<option>-fwarn-context-quantification</option>, enabled by default)
and GHC 7.12 will raise an error. See <link linkend="univ">examples</link>
in GHC documentation.
</para>
<para>
The change also applies to Template Haskell splices such as
<literal>[t|Ord a => a|]</literal>, which should be written as
<literal>[t|forall a. Ord a => a|]</literal>.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Compiler</title>
<itemizedlist>
<listitem>
<para>
GHC now checks that all the language extensions required for
the inferred type signatures are explicitly enabled. This
means that if any of the type signatures inferred in your
program requires some language extension you will need to
enable it. The motivation is that adding a missing type
signature inferred by GHC should yield a program that
typechecks. Previously this was not the case.
</para>
<para>
This is a breaking change. Code that used to compile in the
past might fail with an error message requiring some
particular language extension (most likely
<option>-XTypeFamilies</option>, <option>-XGADTs</option> or
<option>-XFlexibleContexts</option>).
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>GHCi</title>
<itemizedlist>
<listitem>
<para>
TODO FIXME
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Template Haskell</title>
<itemizedlist>
<listitem>
<para>
TODO FIXME
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Runtime system</title>
<itemizedlist>
<listitem>
<para>
TODO FIXME
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Build system</title>
<itemizedlist>
<listitem>
<para>
<literal>ghc-pkg</literal> now respects <option>--user</option>
and <option>--global</option> when modifying packages (e.g.
changing exposed/trust flag or unregistering). Previously,
<literal>ghc-pkg</literal> would ignore these flags and modify
whichever package it found first on the database stack. To
recover the old behavior, simply omit these flags.
</para>
</listitem>
<listitem>
<para>
<literal>ghc-pkg</literal> accepts a <option>--user-package-db</option>
flag which allows a user to override the location of the user package
database. Unlike databases specified using <option>--package-db</option>,
a user package database configured this way respects
the <option>--user</option> flag.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Package system</title>
<itemizedlist>
<listitem>
<para>
TODO: cover module renaming, thinning, re-export etc
</para>
</listitem>
<listitem>
<para>
ghc-pkg (and ghc) have dropped support for single-file style
package databases. Since version 6.12, ghc-pkg has defaulted
to a new database format (using a directory of files, one per
package plus a binary cache).
</para>
<para>
This change will not affect programs and scripts that use
<literal>ghc-pkg init</literal> to create package databases.
</para>
<para>
This will affect scripts that create package databases
using tricks like
<programlisting>
echo "[]" > package.conf
</programlisting>
Such scripts will need to be modified to use
<literal>ghc-pkg init</literal>, and to delete databases
by directory removal, rather than simple file delete.
</para>
</listitem>
</itemizedlist>
</sect3>
</sect2>
<sect2>
<title>Libraries</title>
<sect3>
<title>array</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 0.5.0.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>base</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 4.7.0.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>bin-package-db</title>
<itemizedlist>
<listitem>
<para>
This is an internal package, and should not be used.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>binary</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 0.7.1.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>bytestring</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 0.10.4.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Cabal</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.18.1.3)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>containers</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 0.5.4.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>deepseq</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.3.0.2)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>directory</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.2.0.2)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>filepath</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.3.0.2)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>ghc</title>
<itemizedlist>
<listitem>
<para>
Many internal functions in GHC related to package IDs have been
renamed to refer to package keys, e.g. <literal>PackageId</literal>
is now <literal>PackageKey</literal>, the wired-in names
such as <literal>primPackageId</literal> are now
<literal>primPackageKey</literal>, etc. This reflects a distinction
that we are now making: a package ID is, as before, the user-visible
ID from Cabal <literal>foo-1.0</literal>; a package key is now
a compiler-internal entity used for generating linking symbols, and
may not correspond at all to the package ID. In
particular, there may be multiple package keys per
package ID.
</para>
</listitem>
<listitem>
<para>
The ghc library no longer depends on the Cabal library. This means
that users of the ghc library are no longer forced to use the same
version of Cabal as ghc did. It also means that Cabal is freed up
to be able to depend on packages that ghc does not want to depend
on (which for example may enable improvements to Cabal's parsing
infrastructure).
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>ghc-prim</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 0.3.1.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>haskell98</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 2.0.0.3)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>haskell2010</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.1.1.1)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>hoopl</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 3.10.0.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>hpc</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 0.6.0.1)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>integer-gmp</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 0.5.1.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>old-locale</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.0.0.6)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>old-time</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.1.0.2)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>process</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.2.0.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>template-haskell</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 2.9.0.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>time</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 1.4.1)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>unix</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 2.7.0.0)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Win32</title>
<itemizedlist>
<listitem>
<para>
Version number XXXXX (was 2.3.0.1)
</para>
</listitem>
</itemizedlist>
</sect3>
</sect2>
<sect2>
<title>Known bugs</title>
<itemizedlist>
<listitem>
<para>
TODO FIXME
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
|
