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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>7 Definitions</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="../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="../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,"tocview_0");">▼</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Unstable:<span class="mywbr"> </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 </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 </td><td><a href="Automata__Compiling_State_Machines.html" class="tocviewlink" data-pltdoc="x">Automata:<span class="mywbr"> </span> Compiling State Machines</a></td></tr><tr><td align="right">3 </td><td><a href="bytes.html" class="tocviewlink" data-pltdoc="x">Bytes</a></td></tr><tr><td align="right">4 </td><td><a href="contract.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">5 </td><td><a href="wrapc.html" class="tocviewlink" data-pltdoc="x">Contracts for Macro Subexpressions</a></td></tr><tr><td align="right">6 </td><td><a href="Debugging.html" class="tocviewlink" data-pltdoc="x">Debugging</a></td></tr><tr><td align="right">7 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Definitions</a></td></tr><tr><td align="right">8 </td><td><a href="error.html" class="tocviewlink" data-pltdoc="x">Errors</a></td></tr><tr><td align="right">9 </td><td><a href="future.html" class="tocviewlink" data-pltdoc="x">Futures</a></td></tr><tr><td align="right">10 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href="sequence.html" class="tocviewlink" data-pltdoc="x">Sequences</a></td></tr><tr><td align="right">26 </td><td><a href="string.html" class="tocviewlink" data-pltdoc="x">Strings</a></td></tr><tr><td align="right">27 </td><td><a href="struct.html" class="tocviewlink" data-pltdoc="x">Structs</a></td></tr><tr><td align="right">28 </td><td><a href="custom-write.html" class="tocviewlink" data-pltdoc="x">Struct Printing</a></td></tr><tr><td align="right">29 </td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntax</a></td></tr><tr><td align="right">30 </td><td><a href="temp-c.html" class="tocviewlink" data-pltdoc="x">Temporal Contracts:<span class="mywbr"> </span> Explicit Contract Monitors</a></td></tr><tr><td align="right">31 </td><td><a href="unix-socket.html" class="tocviewlink" data-pltdoc="x">Unix Domain Sockets</a></td></tr><tr><td align="right">32 </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><a href="#%28form._%28%28lib._unstable%2Fdefine..rkt%29._at-end%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">at-<wbr></wbr>end</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fdefine..rkt%29._in-phase1%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">in-<wbr></wbr>phase1</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fdefine..rkt%29._in-phase1%2Fpass2%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">in-<wbr></wbr>phase1/<span class="mywbr"> </span>pass2</span></span></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, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="Debugging.html" title="backward to "6 Debugging"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Unstable: May Change Without Warning"" data-pltdoc="x">up</a> <a href="error.html" title="forward to "8 Errors"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "unstable/scribblings/unstable.scrbl")" x-part-tag=""Definitions"">7<tt> </tt><a name="(part._.Definitions)"></a><a name="(mod-path._unstable/define)"></a>Definitions</h3><div class="SAuthorListBox"><span class="SAuthorList"><p class="author">Carl Eastlund <<a href="mailto:cce@racket-lang.org">cce@racket-lang.org</a>></p></span></div><p><div class="SIntrapara"></div><div class="SIntrapara">This library is <span style="font-style: italic">unstable</span>;
compatibility will not be maintained.
See <a href="index.html" data-pltdoc="x">Unstable: May Change Without Warning</a>
for more information.</div></p><p><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">unstable/define</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">unstable-lib</span></span></td></tr></table></p><p>Provides macros for creating and manipulating definitions.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._unstable/define..rkt)._at-end))"></a><span title="Provided from: unstable/define | Package: unstable-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fdefine..rkt%29._at-end%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">at-end</a></span></span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">When used at the top level of a module, evaluates <span class="RktVar">expr</span> at the end of
the module. This can be useful for calling functions before their definitions.</div></p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=module.html%23%2528form._%2528%2528quote._%7E23%7E25kernel%2529._module%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">module</a></span><span class="hspace"> </span><span class="RktSym">Failure</span><span class="hspace"> </span><span class="RktSym">scheme</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">f</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">f</span><span class="hspace"> </span><span class="RktSym">x</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">x</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">Failure</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktErr">f: undefined;</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">cannot reference an identifier before its definition</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">in module: 'Failure</span></p></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=module.html%23%2528form._%2528%2528quote._%7E23%7E25kernel%2529._module%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">module</a></span><span class="hspace"> </span><span class="RktSym">Success</span><span class="hspace"> </span><span class="RktSym">scheme</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="hspace"> </span><span class="RktSym">unstable/define</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fdefine..rkt%29._at-end%29%29" class="RktStxLink" data-pltdoc="x">at-end</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">f</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">f</span><span class="hspace"> </span><span class="RktSym">x</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">x</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">Success</span><span class="RktPn">)</span></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._unstable/define..rkt)._in-phase1))"></a><span title="Provided from: unstable/define | Package: unstable-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fdefine..rkt%29._in-phase1%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">in-phase1</a></span></span><span class="hspace"> </span><span class="RktVar">e</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Executes <span class="RktVar">e</span> during phase 1 (the syntax transformation phase)
relative to its context, during pass 1 if it occurs in a head expansion
position.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._unstable/define..rkt)._in-phase1/pass2))"></a><span title="Provided from: unstable/define | Package: unstable-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fdefine..rkt%29._in-phase1%2Fpass2%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">in-phase1/pass2</a></span></span><span class="hspace"> </span><span class="RktVar">e</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Executes <span class="RktVar">e</span> during phase 1 (the syntax transformation phase)
relative to its context, during pass 2 (after head expansion).</div></p><div class="navsetbottom"><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, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="Debugging.html" title="backward to "6 Debugging"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Unstable: May Change Without Warning"" data-pltdoc="x">up</a> <a href="error.html" title="forward to "8 Errors"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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