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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>MzScheme: Legacy Language</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">Mz<span class="mywbr"> &nbsp;</span>Scheme:<span class="mywbr"> &nbsp;</span> Legacy Language</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="Old_Syntactic_Forms.html" class="tocviewlink" data-pltdoc="x">Old Syntactic Forms</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="Old_Functions.html" class="tocviewlink" data-pltdoc="x">Old Functions</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="Extra_Libraries.html" class="tocviewlink" data-pltdoc="x">Extra Libraries</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="Omitted_Forms_and_Functions.html" class="tocviewlink" data-pltdoc="x">Omitted Forms and Functions</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">Mz<span class="mywbr"> &nbsp;</span>Scheme:<span class="mywbr"> &nbsp;</span> Legacy Language</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, &quot;6.7&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;6.7&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;6.7&quot;);">up</a>&nbsp;&nbsp;<a href="Old_Syntactic_Forms.html" title="forward to &quot;1 Old Syntactic Forms&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div><h2 x-source-module="(lib &quot;mzscheme/mzscheme.scrbl&quot;)" x-source-pkg="mzscheme-doc" x-part-tag="&quot;top&quot;"><a name="(part._top)"></a><a name="(part._.Mz.Scheme__.Legacy_.Language)"></a><a name="(mod-path._mzscheme)"></a>MzScheme: Legacy Language</h2><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&amp;rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&amp;version=6.7" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">mzscheme</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller">&nbsp;package:</span> <span class="stt">compatibility-lib</span></span></td></tr></table></div><div class="SIntrapara">The <a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">mzscheme</span></a> language provides nearly the same
bindings as the <a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">mzscheme</span></a> module of PLT Scheme
version 372 and earlier.</div></p><p>Unlike version 372, the <a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">mzscheme</span></a> language does not
include <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=r5rs&amp;rel=r5rs-std%2Fr5rs-Z-H-9.html%23%2525_idx_416&amp;version=6.7" class="RktValLink Sq" data-pltdoc="x">set-car!</a></span>  or <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=r5rs&amp;rel=r5rs-std%2Fr5rs-Z-H-9.html%23%2525_idx_418&amp;version=6.7" class="RktValLink Sq" data-pltdoc="x">set-cdr!</a></span>, and <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&amp;rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cons%2529%2529&amp;version=6.7" class="RktValLink Sq" data-pltdoc="x">cons</a></span>
makes immutable pairs, as in <span class="RktSym">scheme/base</span>; those changes make
modules built on <a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">mzscheme</span></a> reasonably compatible with
modules built on <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=scheme&amp;rel=scheme_base.html&amp;version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">scheme/base</span></a>.</p><p>Otherwise, the <a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">mzscheme</span></a> language shares many bindings
with <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=scheme&amp;rel=scheme_base.html&amp;version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">scheme/base</span></a>. It renames a few bindings, such as
<span class="RktSym"><a href="Old_Functions.html#%28def._%28%28lib._mzscheme%2Fmain..rkt%29._syntax-object-~3edatum%29%29" class="RktValLink" data-pltdoc="x">syntax-object-&gt;datum</a></span> instead of <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&amp;rel=stxops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._syntax-%7E3edatum%2529%2529&amp;version=6.7" class="RktValLink Sq" data-pltdoc="x">syntax-&gt;datum</a></span>, and
it provides old versions of some syntactic forms, such as
<span class="RktSym"><a href="Old_Syntactic_Forms.html#%28form._%28%28lib._mzscheme%2Fmain..rkt%29._lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span> without support for keyword and optional arguments.
In addition, <a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">mzscheme</span></a> includes all of the exports of
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&amp;rel=tcp.html&amp;version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a> and <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&amp;rel=udp.html&amp;version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/udp</span></a>.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Old_Syntactic_Forms.html" class="toptoclink" data-pltdoc="x">1<span class="hspace">&nbsp;</span>Old Syntactic Forms</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="Old_Functions.html" class="toptoclink" data-pltdoc="x">2<span class="hspace">&nbsp;</span>Old Functions</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="Extra_Libraries.html" class="toptoclink" data-pltdoc="x">3<span class="hspace">&nbsp;</span>Extra 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="Omitted_Forms_and_Functions.html" class="toptoclink" data-pltdoc="x">4<span class="hspace">&nbsp;</span>Omitted Forms and Functions</a></p></td></tr></table><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, &quot;6.7&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;6.7&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;6.7&quot;);">up</a>&nbsp;&nbsp;<a href="Old_Syntactic_Forms.html" title="forward to &quot;1 Old Syntactic Forms&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div></div></div><div id="contextindicator">&nbsp;</div></body></html>