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|
<?xml version="1.0" encoding="iso-8859-1"?>
<sect1 id="release-7-12-1">
<title>Release notes for version 7.12.1</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 7.10 branch.
</para>
<sect2>
<title>Highlights</title>
<para>
The highlights, since the 7.10 branch, are:
</para>
<itemizedlist>
<listitem>
<para>
TODO FIXME
</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>Full details</title>
<sect3>
<title>Language</title>
<itemizedlist>
<listitem>
<para>
TODO FIXME.
</para>
</listitem>
<listitem>
<para>
The parser now supports Haddock comments on GADT data constructors. For example,
<programlisting>
data Expr a where
-- | Just a normal sum
Sum :: Int -> Int -> Expr Int
</programlisting>
</para>
</listitem>
<listitem>
<para>
Implicit parameters of the new base type
<literal>GHC.Stack.CallStack</literal> are treated
specially, and automatically solved for the current source
location. For example
<programlisting>
f = print (?stk :: CallStack)
</programlisting>
will print the singleton stack containing the occurrence of
<literal>?stk</literal>. If there is another
<literal>CallStack</literal> implicit in-scope, the new location
will be appended to the existing stack, e.g.
<programlisting>
f :: (?stk :: CallStack) => IO ()
f = print (?stk :: CallStack)
</programlisting>
will print the occurrence of <literal>?stk</literal> and the
call-site of <literal>f</literal>. The name of the implicit
parameter does not matter.
</para>
<para>
See the release notes for base for a description of the
<literal>CallStack</literal> type.
</para>
</listitem>
<listitem>
<para>
To conform to the common case, the default role assigned to parameters
of datatypes declared in <literal>hs-boot</literal> files is
<literal>representational</literal>. However, if the constructor(s)
for the datatype are given, it makes sense to do normal role inference.
This is now implemented, effectively making the default role for
non-abstract datatypes in <literal>hs-boot</literal> files to be
<literal>phantom</literal>, like it is in regular Haskell code.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Compiler</title>
<itemizedlist>
<listitem>
<para>
Added the option <option>-dth-dec-file</option>.
This dumps out a .th.hs file of all Template Haskell declarations in a corresponding .hs file. The idea is that application developers can check this into their repository so that they can grep for identifiers used elsewhere that were defined in Template Haskell.
This is similar to using <option>-ddump-to-file</option> with <option>-ddump-splices</option> but it always generates a file instead of being coupled to <option>-ddump-to-file</option> and only outputs code that does not exist in the .hs file and a comment for the splice location in the original file.
</para>
</listitem>
<listitem>
<para>
Added the option <option>-fprint-expanded-types</option>.
When enabled, GHC also prints type-synonym-expanded types in
type errors.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>GHCi</title>
<itemizedlist>
<listitem>
<para>
<literal>Main</literal> with an explicit module header but
without <literal>main</literal> is now an error (#7765).
</para>
<para>
The <literal>:back</literal> and <literal>:forward</literal>
commands now take an optional count allowing the user to move forward or
backward in history several steps at a time.
</para>
<para>
Added commands <literal>:load!</literal> and <literal>:reload!</literal>,
effectively setting "-fdefer-type-errors" before loading a module and
unsetting it after loading if it has not been set before (#8353).
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Template Haskell</title>
<itemizedlist>
<listitem>
<para>
The <literal>TemplateHaskell</literal> now no longer automatically
errors when used with a stage 1 compiler (i.e. GHC without
interpreter support); in particular, plain
Haskell quotes (not quasi-quotes) can now be compiled without erroring.
Splices and quasi-quotes continue to only be supported by a
stage 2 compiler.
</para>
</listitem>
<listitem>
<para>
Partial type signatures can now be used in splices, see <xref linkend="pts-where"/>.
</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>
TODO FIXME.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Package system</title>
<itemizedlist>
<listitem>
<para>
TODO FIXME.
</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>
<listitem>
<para>
A new module <literal>GHC.SrcLoc</literal> was added,
exporting a new type <literal>SrcLoc</literal>. A
<literal>SrcLoc</literal> contains package, module,
and file names, as well as start and end positions.
</para>
</listitem>
<listitem>
<para>
A new type <literal>CallStack</literal> was added for use
with the new implicit callstack parameters. A
<literal>CallStack</literal> is a
<literal>[(String, SrcLoc)]</literal>, sorted by most-recent
call.
</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>
TODO FIXME.
</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>
<listitem>
<para>
The <literal>Lift</literal> type class for lifting values
into Template Haskell splices now has a default signature
<literal>lift :: Data a => a -> Q Exp</literal>, which means
that you do not have to provide an explicit implementation
of <literal>lift</literal> for types which have a <literal>Data</literal>
instance. To manually use this default implementation, you
can use the <literal>liftData</literal> function which is
now exported from <literal>Language.Haskell.TH.Syntax</literal>.
</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>
|
