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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>R5RS: Legacy Scheme</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,"tocview_0");">▼</a></td><td></td><td><a href="" class="tocviewselflink" data-pltdoc="x">R5RS:<span class="mywbr"> </span> Legacy Scheme</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="running.html" class="tocviewlink" data-pltdoc="x">Running R<span style="vertical-align: super; font-size: 80%">5</span>RS Programs</a></td></tr><tr><td align="right">2 </td><td><a href="plt-r5rs.html" class="tocviewlink" data-pltdoc="x"><span class="stt">plt-<wbr></wbr>r5rs</span></a></td></tr><tr><td align="right">3 </td><td><a href="r5rs-mod.html" class="tocviewlink" data-pltdoc="x">R<span style="vertical-align: super; font-size: 80%">5</span>RS Module Language</a></td></tr><tr><td align="right">4 </td><td><a href="r5rs_init-mod.html" class="tocviewlink" data-pltdoc="x">R<span style="vertical-align: super; font-size: 80%">5</span>RS Initialization Library</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">R5RS:<span class="mywbr"> </span> Legacy Scheme</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.7</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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <span class="nonavigation">← prev</span> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">up</a> <a href="running.html" title="forward to "1 Running R5RS Programs"" data-pltdoc="x">next →</a></span> </div><h2 x-source-module="(lib "r5rs/r5rs.scrbl")" x-source-pkg="r5rs-doc" x-part-tag=""top""><a name="(part._top)"></a><a name="(part._.R5.R.S__.Legacy_.Scheme)"></a>R5RS: Legacy Scheme</h2><p>The <a href="r5rs-std/index.html">The Revised<span style="vertical-align: super; font-size: 80%">5</span> Report
on the Algorithmic Language Scheme</a> defines a dialect of Scheme. We
use <span style="font-style: italic">R<span style="vertical-align: super; font-size: 80%">5</span>RS</span> to refer to both the standard and the language
defined by the standard.</p><blockquote class="refpara"><blockquote class="refcolumn"><blockquote class="refcontent"><p>See <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=guide&rel=dialects.html&version=6.7" class="Sq" data-pltdoc="x">Dialects of Racket and Scheme</a> for general information about different
dialects of Scheme within Racket.</p></blockquote></blockquote></blockquote><p>The default dialect of Lisp provided by <span class="stt">racket</span> and other
Racket tools differs from R<span style="vertical-align: super; font-size: 80%">5</span>RS in many ways, but Racket
includes tools and libraries for running R<span style="vertical-align: super; font-size: 80%">5</span>RS programs.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="running.html" class="toptoclink" data-pltdoc="x">1<span class="hspace"> </span>Running R<span style="vertical-align: super; font-size: 80%">5</span>RS Programs</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="plt-r5rs.html" class="toptoclink" data-pltdoc="x">2<span class="hspace"> </span><span class="stt">plt-r5rs</span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="r5rs-mod.html" class="toptoclink" data-pltdoc="x">3<span class="hspace"> </span>R<span style="vertical-align: super; font-size: 80%">5</span>RS Module Language</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="r5rs-mod.html#%28part._.Non-.R5.R.S_.Bindings_from_r5rs%29" class="toclink" data-pltdoc="x">3.1<span class="hspace"> </span>Non-R<span style="vertical-align: super; font-size: 80%">5</span>RS Bindings from <span class="RktModLink"><span class="RktSym">r5rs</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="r5rs-mod.html#%28part._.Notes_on_.R5.R.S_.Functions%29" class="toclink" data-pltdoc="x">3.2<span class="hspace"> </span>Notes on R<span style="vertical-align: super; font-size: 80%">5</span>RS Functions</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="r5rs_init-mod.html" class="toptoclink" data-pltdoc="x">4<span class="hspace"> </span>R<span style="vertical-align: super; font-size: 80%">5</span>RS Initialization Library</a></p></td></tr></table><p><a name="(form._((lib._r5rs/main..rkt)._lambda))"></a><a name="(form._((lib._r5rs/main..rkt)._set!))"></a><a 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name="(def._((lib._r5rs/main..rkt)._~3c~3d))"></a><a name="(def._((lib._r5rs/main..rkt)._~3c))"></a><a name="(def._((lib._r5rs/main..rkt)._/))"></a><a name="(def._((lib._r5rs/main..rkt)._-))"></a><a name="(def._((lib._r5rs/main..rkt)._+))"></a><a name="(def._((lib._r5rs/main..rkt)._*))"></a></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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <span 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