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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>12.6 Local Binding with Splicing Body</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="extras.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"><span style="font-weight: bold">The Racket Reference</span></a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="model.html" class="tocviewlink" data-pltdoc="x">Language Model</a></td></tr><tr><td align="right">2 </td><td><a href="notation.html" class="tocviewlink" data-pltdoc="x">Notation for Documentation</a></td></tr><tr><td align="right">3 </td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntactic Forms</a></td></tr><tr><td align="right">4 </td><td><a href="data.html" class="tocviewlink" data-pltdoc="x">Datatypes</a></td></tr><tr><td align="right">5 </td><td><a href="structures.html" class="tocviewlink" data-pltdoc="x">Structures</a></td></tr><tr><td align="right">6 </td><td><a href="mzlib_class.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">7 </td><td><a href="mzlib_unit.html" class="tocviewlink" data-pltdoc="x">Units</a></td></tr><tr><td align="right">8 </td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">9 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">10 </td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Control Flow</a></td></tr><tr><td align="right">11 </td><td><a href="concurrency.html" class="tocviewlink" data-pltdoc="x">Concurrency and Parallelism</a></td></tr><tr><td align="right">12 </td><td><a href="Macros.html" class="tocviewselflink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">13 </td><td><a href="input-and-output.html" class="tocviewlink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">14 </td><td><a href="security.html" class="tocviewlink" data-pltdoc="x">Reflection and Security</a></td></tr><tr><td align="right">15 </td><td><a href="os.html" class="tocviewlink" data-pltdoc="x">Operating System</a></td></tr><tr><td align="right">16 </td><td><a href="memory.html" class="tocviewlink" data-pltdoc="x">Memory Management</a></td></tr><tr><td align="right">17 </td><td><a href="unsafe.html" class="tocviewlink" data-pltdoc="x">Unsafe Operations</a></td></tr><tr><td align="right">18 </td><td><a href="running.html" class="tocviewlink" data-pltdoc="x">Running Racket</a></td></tr><tr><td align="right"></td><td><a href="doc-bibliography.html" class="tocviewlink" data-pltdoc="x">Bibliography</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>12 </td><td><a href="Macros.html" class="tocviewlink" data-pltdoc="x">Macros</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">12.1 </td><td><a href="stx-patterns.html" class="tocviewlink" data-pltdoc="x">Pattern-<wbr></wbr>Based Syntax Matching</a></td></tr><tr><td align="right">12.2 </td><td><a href="stxops.html" class="tocviewlink" data-pltdoc="x">Syntax Object Content</a></td></tr><tr><td align="right">12.3 </td><td><a href="stxcmp.html" class="tocviewlink" data-pltdoc="x">Syntax Object Bindings</a></td></tr><tr><td align="right">12.4 </td><td><a href="stxtrans.html" class="tocviewlink" data-pltdoc="x">Syntax Transformers</a></td></tr><tr><td align="right">12.5 </td><td><a href="stxparam.html" class="tocviewlink" data-pltdoc="x">Syntax Parameters</a></td></tr><tr><td align="right">12.6 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Local Binding with Splicing Body</a></td></tr><tr><td align="right">12.7 </td><td><a href="stxprops.html" class="tocviewlink" data-pltdoc="x">Syntax Object Properties</a></td></tr><tr><td align="right">12.8 </td><td><a href="stxcerts.html" class="tocviewlink" data-pltdoc="x">Syntax Taints</a></td></tr><tr><td align="right">12.9 </td><td><a href="Expanding_Top-Level_Forms.html" class="tocviewlink" data-pltdoc="x">Expanding Top-<wbr></wbr>Level Forms</a></td></tr><tr><td align="right">12.10 </td><td><a href="include.html" class="tocviewlink" data-pltdoc="x">File Inclusion</a></td></tr><tr><td align="right">12.11 </td><td><a href="syntax-util.html" class="tocviewlink" data-pltdoc="x">Syntax Utilities</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._racket%2Fsplicing..rkt%29._splicing-let%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>let</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>letrec</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let-values%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>let-<wbr></wbr>values</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec-values%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>letrec-<wbr></wbr>values</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let-syntax%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>let-<wbr></wbr>syntax</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec-syntax%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>letrec-<wbr></wbr>syntax</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let-syntaxes%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>let-<wbr></wbr>syntaxes</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec-syntaxes%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>letrec-<wbr></wbr>syntaxes</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec-syntaxes%2Bvalues%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>letrec-<wbr></wbr>syntaxes+<span class="mywbr"> </span>values</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-local%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>local</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-syntax-parameterize%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">splicing-<wbr></wbr>syntax-<wbr></wbr>parameterize</span></span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><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, "6.3", "../");" 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("6.3");">top</a></span><span class="navright"> <a href="stxparam.html" title="backward to "12.5 Syntax Parameters"" data-pltdoc="x">← prev</a> <a href="Macros.html" title="up to "12 Macros"" data-pltdoc="x">up</a> <a href="stxprops.html" title="forward to "12.7 Syntax Object Properties"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-source-pkg="racket-doc" x-part-tag=""splicing"">12.6<tt> </tt><a name="(part._splicing)"></a><a name="(mod-path._racket/splicing)"></a>Local Binding with Splicing Body</h4><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="require.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._require%29%29" class="RktStxLink" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/splicing</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">base</span></span></td></tr></table></div><div class="SIntrapara">The bindings documented in this section are provided by the <a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/splicing</span></a> library, not <a href="index.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/base</span></a> or <a href="index.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-let))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-let</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-letrec))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-letrec</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-let-values))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let-values%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-let-values</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-letrec-values))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec-values%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-letrec-values</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-let-syntax))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let-syntax%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-let-syntax</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-letrec-syntax))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec-syntax%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-letrec-syntax</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-let-syntaxes))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let-syntaxes%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-let-syntaxes</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-letrec-syntaxes))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec-syntaxes%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-letrec-syntaxes</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-letrec-syntaxes+values))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec-syntaxes%2Bvalues%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-letrec-syntaxes+values</a></span></span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/splicing..rkt)._splicing-local))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-local%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-local</a></span></span></p></blockquote></td></tr></table></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._let%29%29" class="RktStxLink" data-pltdoc="x">let</a></span>, <span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._letrec%29%29" class="RktStxLink" data-pltdoc="x">letrec</a></span>, <span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._let-values%29%29" class="RktStxLink" data-pltdoc="x">let-values</a></span>,
<span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._letrec-values%29%29" class="RktStxLink" data-pltdoc="x">letrec-values</a></span>, <span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._let-syntax%29%29" class="RktStxLink" data-pltdoc="x">let-syntax</a></span>, <span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._letrec-syntax%29%29" class="RktStxLink" data-pltdoc="x">letrec-syntax</a></span>,
<span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._let-syntaxes%29%29" class="RktStxLink" data-pltdoc="x">let-syntaxes</a></span>, <span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._letrec-syntaxes%29%29" class="RktStxLink" data-pltdoc="x">letrec-syntaxes</a></span>,
<span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._letrec-syntaxes%2Bvalues%29%29" class="RktStxLink" data-pltdoc="x">letrec-syntaxes+values</a></span>, and <span class="RktSym"><a href="local.html#%28form._%28%28lib._racket%2Flocal..rkt%29._local%29%29" class="RktStxLink" data-pltdoc="x">local</a></span>, except that in a
definition context, the body forms are spliced into the enclosing
definition context (in the same way as for <span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span>).</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="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let-syntax%29%29" class="RktStxLink" data-pltdoc="x">splicing-let-syntax</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktSym">one</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">stx</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktRdr">#'</span><span class="RktVal">1</span><span class="RktPn">)</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="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">o</span><span class="hspace"> </span><span class="RktSym">one</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="RktSym">o</span></td></tr><tr><td><p><span class="RktRes">1</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktSym">one</span></td></tr><tr><td><p><span class="RktErr">one: undefined;</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">cannot reference undefined identifier</span></p></td></tr></table></blockquote></td></tr></table></p><p>When a splicing binding form occurs in a <a href="syntax-model.html#%28tech._top._level._context%29" class="techoutside" data-pltdoc="x"><span class="techinside">top-level context</span></a> or
<a href="syntax-model.html#%28tech._module._context%29" class="techoutside" data-pltdoc="x"><span class="techinside">module context</span></a>, its local bindings are treated similarly to
definitions. In particular, syntax bindings are
evaluated every time the module is <a href="syntax-model.html#%28tech._visit%29" class="techoutside" data-pltdoc="x"><span class="techinside">visit</span></a>ed, instead of only
once during compilation as in <span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._let-syntax%29%29" class="RktStxLink" data-pltdoc="x">let-syntax</a></span>, etc.</p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Example:</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="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-letrec%29%29" class="RktStxLink" data-pltdoc="x">splicing-letrec</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktSym">bad</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">bad</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktSym">x</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><span class="RktErr">bad.0: undefined;</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">cannot reference undefined identifier</span></p></td></tr></table></blockquote></td></tr></table></p><p>If a definition within a splicing form is intended to be local to the
splicing body, then the identifier should have a true value for the
<span class="RktVal">'</span><span class="RktVal">definition-intended-as-local</span> <a href="stxprops.html#%28tech._syntax._property%29" class="techoutside" data-pltdoc="x"><span class="techinside">syntax property</span></a>. For
example, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let%29%29" class="RktStxLink" data-pltdoc="x">splicing-let</a></span> itself adds the property to
locally-bound identifiers as it expands to a sequence of definitions,
so that nesting <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-let%29%29" class="RktStxLink" data-pltdoc="x">splicing-let</a></span> within a splicing form works as
expected (without any ambiguous bindings).</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"><a name="(form._((lib._racket/splicing..rkt)._splicing-syntax-parameterize))"></a><span title="Provided from: racket/splicing | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-syntax-parameterize%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">splicing-syntax-parameterize</a></span></span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="stxparam.html#%28form._%28%28lib._racket%2Fstxparam..rkt%29._syntax-parameterize%29%29" class="RktStxLink" data-pltdoc="x">syntax-parameterize</a></span>, except that in a definition context, the body
forms are spliced into the enclosing definition context (in the same way as for
<span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span>). In a definition context, the body of
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-syntax-parameterize%29%29" class="RktStxLink" data-pltdoc="x">splicing-syntax-parameterize</a></span> can be empty.</div></p><p>Note that <a href="stxtrans.html#%28tech._require._transformer%29" class="techoutside" data-pltdoc="x"><span class="techinside">require transformers</span></a> and <a href="stxtrans.html#%28tech._provide._transformer%29" class="techoutside" data-pltdoc="x"><span class="techinside">provide transformers</span></a> are not
affected by syntax parameterization. While all uses of <span class="RktSym"><a href="require.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._require%29%29" class="RktStxLink" data-pltdoc="x">require</a></span> and
<span class="RktSym"><a href="require.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._provide%29%29" class="RktStxLink" data-pltdoc="x">provide</a></span> will be spliced into the enclosing context, derived import or
export specifications will expand as if they had not been inside of the
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-syntax-parameterize%29%29" class="RktStxLink" data-pltdoc="x">splicing-syntax-parameterize</a></span>.</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><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="stxparam.html#%28form._%28%28lib._racket%2Fstxparam..rkt%29._define-syntax-parameter%29%29" class="RktStxLink" data-pltdoc="x">define-syntax-parameter</a></span><span class="hspace"> </span><span class="RktSym"><a href="places.html#%28form._%28%28lib._racket%2Fplace..rkt%29._place%29%29" class="RktStxLink" data-pltdoc="x">place</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">stx</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktRdr">#'</span><span class="RktVal">"Kansas"</span><span class="RktPn">)</span><span class="RktPn">)</span></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="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._define-syntax-rule%29%29" class="RktStxLink" data-pltdoc="x">define-syntax-rule</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">where</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">`</span><span class="RktVal">(</span><span class="RktVal">at</span><span class="hspace"> </span><span class="RktRdr">,</span><span class="RktPn">(</span><span class="RktSym"><a href="places.html#%28form._%28%28lib._racket%2Fplace..rkt%29._place%29%29" class="RktStxLink" data-pltdoc="x">place</a></span><span class="RktPn">)</span><span class="RktVal">)</span><span class="RktPn">)</span></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">where</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">'(at "Kansas")</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="#%28form._%28%28lib._racket%2Fsplicing..rkt%29._splicing-syntax-parameterize%29%29" class="RktStxLink" data-pltdoc="x">splicing-syntax-parameterize</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktSym"><a href="places.html#%28form._%28%28lib._racket%2Fplace..rkt%29._place%29%29" class="RktStxLink" data-pltdoc="x">place</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">stx</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktRdr">#'</span><span class="RktVal">"Oz"</span><span class="RktPn">)</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="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">here</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">where</span><span class="RktPn">)</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="RktSym">here</span></td></tr><tr><td><p><span class="RktRes">'(at "Oz")</span></p></td></tr></table></blockquote></td></tr></table></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, "6.3", "../");" onfocus="this.style.color="black"; 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