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<center><h1>Language extensions in nhc98</h1></center>

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<h3>What language extensions does <em>nhc98</em> support?</h3>
<p>
Extensions of the Haskell'98 language available in <em>nhc98</em> include:

<ul>

<li>
  The standard <a href="ffi.html">primitive FFI</a> language addendum.

<li>
  Extended module namespaces, of the form Long.Hierarchical.Module.Name.

<li>
  Local forall quantification on datatypes.  (Also known as existential
  types, not to be confused with rank-2 types.)

<li>
  Pattern guards (new in 1.20).

<li>
  Some common standard hierarchical libraries packages.  Use the
  compiler option e.g. <tt>-package base</tt> to access them.

<li>
  The NHC.IOExtras library, containing IORefs, IOArrays, trace,
  unsafePerformIO, etc.

<li>
  Andy Gill's Observe.lhs library, used for HOOD debugging.

<li>
  A <em>Binary</em> data representation library.
  In summary, this library
  module provides bit-stream operations and a new Binary class for which
  the compiler fully supports "deriving" clauses.
  Fuller details can be found in [1] and in
  <a href="libs/Binary.html">this documentation</a>.

</ul>


<h4>References</h4>
<p>
[1] The Bits Between The Lambdas - Binary Data in a Lazy Functional Language,
    Malcolm Wallace and Colin Runciman, Proceedings of the International
    Symposium on Memory Management, Vancouver, Oct 1998.
    [<a href="ftp://ftp.cs.york.ac.uk/pub/malcolm/ismm98.html">FTP site</a>]


<hr>
<p>
The latest updates to these pages are available on the WWW from
<a href="http://www.haskell.org/nhc98/">
<tt>http://www.haskell.org/nhc98/</tt></a>

<p>
23rd November 2007<br>
<a href="http://www.cs.york.ac.uk/fp/">
York Functional Programming Group</a><br>

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