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ghc-text-devel-0.8.1.0-1.fc14.1.i686.rpm

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>text-0.8.1.0: An efficient packed Unicode text type.</TD
><TD CLASS="topbut"
><A HREF="src/Data-Text-IO.html"
>Source code</A
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><FONT SIZE="6"
>Data.Text.IO</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>GHC</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>experimental</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>bos@serpentine.com</TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
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><TR
><TD CLASS="section4"
><B
>Contents</B
></TD
></TR
><TR
><TD
><DL
><DT
><A HREF="#1"
>Locale support
</A
></DT
><DT
><A HREF="#2"
>Operations on handles
</A
></DT
><DT
><A HREF="#3"
>Special cases for standard input and output
</A
></DT
></DL
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
>Efficient locale-sensitive support for text I/O.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="#v%3AreadFile"
>readFile</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AFilePath"
>FilePath</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AwriteFile"
>writeFile</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AFilePath"
>FilePath</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AappendFile"
>appendFile</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AFilePath"
>FilePath</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AhGetContents"
>hGetContents</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AhGetLine"
>hGetLine</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AhPutStr"
>hPutStr</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AhPutStrLn"
>hPutStrLn</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Ainteract"
>interact</A
> :: (<A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
>) -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetContents"
>getContents</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetLine"
>getLine</A
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AputStr"
>putStr</A
> :: <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AputStrLn"
>putStrLn</A
> :: <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="1"
><A NAME="1"
>Locale support
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="doc"
><P
><EM
>Note</EM
>: The behaviour of functions in this module depends on the
 version of GHC you are using.
</P
><P
>Beginning with GHC 6.12, text I/O is performed using the system or
 handle's current locale and line ending conventions.
</P
><P
>Under GHC 6.10 and earlier, the system I/O libraries do not
 support locale-sensitive I/O or line ending conversion.  On these
 versions of GHC, functions in this library all use UTF-8.  What
 does this mean in practice?
</P
><UL
><LI
> All data that is read will be decoded as UTF-8.
</LI
><LI
> Before data is written, it is first encoded as UTF-8.
</LI
><LI
> On both reading and writing, the platform's native newline
   conversion is performed.
</LI
></UL
><P
>If you must use a non-UTF-8 locale on an older version of GHC, you
 will have to perform the transcoding yourself, e.g. as follows:
</P
><PRE
> import qualified Data.ByteString as B
 import Data.Text (Text)
 import Data.Text.Encoding (encodeUtf16)

 putStr_Utf16LE :: Text -&gt; IO ()
 putStr_Utf16LE t = B.putStr (encodeUtf16LE t)
</PRE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:readFile"
><A NAME="v%3AreadFile"
></A
></A
><B
>readFile</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AFilePath"
>FilePath</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#readFile"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>The <TT
><A HREF="Data-Text-IO.html#v%3AreadFile"
>readFile</A
></TT
> function reads a file and returns the contents of
 the file as a string.  The entire file is read strictly, as with
 <TT
><A HREF="Data-Text-IO.html#v%3AgetContents"
>getContents</A
></TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:writeFile"
><A NAME="v%3AwriteFile"
></A
></A
><B
>writeFile</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AFilePath"
>FilePath</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#writeFile"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Write a string to a file.  The file is truncated to zero length
 before writing begins.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:appendFile"
><A NAME="v%3AappendFile"
></A
></A
><B
>appendFile</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AFilePath"
>FilePath</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#appendFile"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Write a string the end of a file.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="2"
><A NAME="2"
>Operations on handles
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:hGetContents"
><A NAME="v%3AhGetContents"
></A
></A
><B
>hGetContents</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#hGetContents"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Read the remaining contents of a <TT
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
></TT
> as a string.  The
 <TT
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
></TT
> is closed once the contents have been read, or if an
 exception is thrown.
</P
><P
>Internally, this function reads a chunk at a time from the
 lower-level buffering abstraction, and concatenates the chunks into
 a single string once the entire file has been read.
</P
><P
>As a result, it requires approximately twice as much memory as its
 result to construct its result.  For files more than a half of
 available RAM in size, this may result in memory exhaustion.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:hGetLine"
><A NAME="v%3AhGetLine"
></A
></A
><B
>hGetLine</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#hGetLine"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Read a single line from a handle.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:hPutStr"
><A NAME="v%3AhPutStr"
></A
></A
><B
>hPutStr</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#hPutStr"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Write a string to a handle.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:hPutStrLn"
><A NAME="v%3AhPutStrLn"
></A
></A
><B
>hPutStrLn</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle.html#t%3AHandle"
>Handle</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#hPutStrLn"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Write a string to a handle, followed by a newline.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="3"
><A NAME="3"
>Special cases for standard input and output
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:interact"
><A NAME="v%3Ainteract"
></A
></A
><B
>interact</B
> :: (<A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="Data-Text.html#t%3AText"
>Text</A
>) -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#interact"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>The <TT
><A HREF="Data-Text-IO.html#v%3Ainteract"
>interact</A
></TT
> function takes a function of type <TT
>Text -&gt; Text</TT
>
 as its argument. The entire input from the standard input device is
 passed to this function as its argument, and the resulting string
 is output on the standard output device.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:getContents"
><A NAME="v%3AgetContents"
></A
></A
><B
>getContents</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#getContents"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Read all user input on <TT
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle-FD.html#v%3Astdin"
>stdin</A
></TT
> as a single string.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:getLine"
><A NAME="v%3AgetLine"
></A
></A
><B
>getLine</B
> :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="Data-Text.html#t%3AText"
>Text</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#getLine"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Read a single line of user input from <TT
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle-FD.html#v%3Astdin"
>stdin</A
></TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:putStr"
><A NAME="v%3AputStr"
></A
></A
><B
>putStr</B
> :: <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#putStr"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Write a string to <TT
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle-FD.html#v%3Astdout"
>stdout</A
></TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:putStrLn"
><A NAME="v%3AputStrLn"
></A
></A
><B
>putStrLn</B
> :: <A HREF="Data-Text.html#t%3AText"
>Text</A
> -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO"
>IO</A
> <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
><TD CLASS="declbut"
><A HREF="src/Data-Text-IO.html#putStrLn"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Write a string to <TT
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/GHC-IO-Handle-FD.html#v%3Astdout"
>stdout</A
></TT
>, followed by a newline.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
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