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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>Unstable: May Change Without Warning</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_0&quot;);">&#9660;</a></td><td></td><td><a href="" class="tocviewselflink" data-pltdoc="x">Unstable:<span class="mywbr"> &nbsp;</span> May Change Without Warning</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="guidelines.html" class="tocviewlink" data-pltdoc="x">Guidelines for Developing <span class="RktSym">unstable</span> Libraries</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="Automata__Compiling_State_Machines.html" class="tocviewlink" data-pltdoc="x">Automata:<span class="mywbr"> &nbsp;</span> Compiling State Machines</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="bytes.html" class="tocviewlink" data-pltdoc="x">Bytes</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="contract.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">5&nbsp;</td><td><a href="wrapc.html" class="tocviewlink" data-pltdoc="x">Contracts for Macro Subexpressions</a></td></tr><tr><td align="right">6&nbsp;</td><td><a href="Debugging.html" class="tocviewlink" data-pltdoc="x">Debugging</a></td></tr><tr><td align="right">7&nbsp;</td><td><a href="Definitions.html" class="tocviewlink" data-pltdoc="x">Definitions</a></td></tr><tr><td align="right">8&nbsp;</td><td><a href="error.html" class="tocviewlink" data-pltdoc="x">Errors</a></td></tr><tr><td align="right">9&nbsp;</td><td><a href="future.html" class="tocviewlink" data-pltdoc="x">Futures</a></td></tr><tr><td align="right">10&nbsp;</td><td><a href="Functions.html" class="tocviewlink" data-pltdoc="x">Functions</a></td></tr><tr><td align="right">11&nbsp;</td><td><a href="Hash_Tables.html" class="tocviewlink" data-pltdoc="x">Hash Tables</a></td></tr><tr><td align="right">12&nbsp;</td><td><a href="class-iop.html" class="tocviewlink" data-pltdoc="x">Interface-<wbr></wbr>Oriented Programming for Classes</a></td></tr><tr><td align="right">13&nbsp;</td><td><a href="lazy-require.html" class="tocviewlink" data-pltdoc="x">Lazy Require</a></td></tr><tr><td align="right">14&nbsp;</td><td><a href="list.html" class="tocviewlink" data-pltdoc="x">Lists</a></td></tr><tr><td align="right">15&nbsp;</td><td><a href="Logging.html" class="tocviewlink" data-pltdoc="x">Logging</a></td></tr><tr><td align="right">16&nbsp;</td><td><a href="macro-testing.html" class="tocviewlink" data-pltdoc="x">Macro Testing</a></td></tr><tr><td align="right">17&nbsp;</td><td><a href="Mark_Parameters.html" class="tocviewlink" data-pltdoc="x">Mark Parameters</a></td></tr><tr><td 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align="right">25&nbsp;</td><td><a href="sequence.html" class="tocviewlink" data-pltdoc="x">Sequences</a></td></tr><tr><td align="right">26&nbsp;</td><td><a href="string.html" class="tocviewlink" data-pltdoc="x">Strings</a></td></tr><tr><td align="right">27&nbsp;</td><td><a href="struct.html" class="tocviewlink" data-pltdoc="x">Structs</a></td></tr><tr><td align="right">28&nbsp;</td><td><a href="custom-write.html" class="tocviewlink" data-pltdoc="x">Struct Printing</a></td></tr><tr><td align="right">29&nbsp;</td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntax</a></td></tr><tr><td align="right">30&nbsp;</td><td><a href="temp-c.html" class="tocviewlink" data-pltdoc="x">Temporal Contracts:<span class="mywbr"> &nbsp;</span> Explicit Contract Monitors</a></td></tr><tr><td align="right">31&nbsp;</td><td><a href="unix-socket.html" class="tocviewlink" data-pltdoc="x">Unix Domain Sockets</a></td></tr><tr><td align="right">32&nbsp;</td><td><a href="2d.html" class="tocviewlink" data-pltdoc="x">2D Syntax</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._top%29" class="tocsubseclink" data-pltdoc="x">Unstable:<span class="mywbr"> &nbsp;</span> May Change Without Warning</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.1</span></div><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<span class="nonavigation">&larr; prev</span>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">up</a>&nbsp;&nbsp;<a href="guidelines.html" title="forward to &quot;1 Guidelines for Developing unstable Libraries&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div><h2 x-source-module="(lib &quot;unstable/scribblings/unstable.scrbl&quot;)" x-part-tag="&quot;top&quot;"><a name="(part._top)"></a><a name="(part._unstable)"></a>Unstable: May Change Without Warning</h2><p>This manual documents some of the libraries available in the
<span class="RktSym">unstable</span> collection. See also <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?tag=%28part._%28.%27%28lib._unstable%2Fscribblings%2Fgui%2Funstable-gui..scrbl%29.%27._.%27top.%27%29%29&amp;version=6.1" class="Sq" data-pltdoc="x">the unstable
GUI libraries documentation</a>.</p><p>The name <span class="RktSym">unstable</span> is intended as a warning that the
<span style="font-weight: bold">interfaces</span> in particular are unstable. Developers of planet
packages and external projects should avoid using modules in the
unstable collection. Contracts may change, names may change or
disappear, even entire modules may move or disappear without warning
to the outside world.</p><p>Developers of unstable libraries must follow the guidelines in
<a href="guidelines.html" data-pltdoc="x">Guidelines for Developing <span class="RktSym">unstable</span> Libraries</a>.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="guidelines.html" class="toptoclink" data-pltdoc="x">1<span class="hspace">&nbsp;</span>Guidelines for Developing <span class="RktSym">unstable</span> Libraries</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Automata__Compiling_State_Machines.html" class="toptoclink" data-pltdoc="x">2<span class="hspace">&nbsp;</span>Automata: Compiling State Machines</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="bytes.html" class="toptoclink" data-pltdoc="x">3<span class="hspace">&nbsp;</span>Bytes</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span 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