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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>2.2 Legacy Languages</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="index.html" class="tocviewlink" data-pltdoc="x">Dr<span class="mywbr"> </span>Racket:<span class="mywbr"> </span> The Racket Programming Environment</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="interface-essentials.html" class="tocviewlink" data-pltdoc="x">Interface Essentials</a></td></tr><tr><td align="right">2 </td><td><a href="languages.html" class="tocviewselflink" data-pltdoc="x">Languages</a></td></tr><tr><td align="right">3 </td><td><a href="Interface_Reference.html" class="tocviewlink" data-pltdoc="x">Interface Reference</a></td></tr><tr><td align="right">4 </td><td><a href="extending-drracket.html" class="tocviewlink" data-pltdoc="x">Extending Dr<span class="mywbr"> </span>Racket</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>2 </td><td><a href="languages.html" class="tocviewlink" data-pltdoc="x">Languages</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">2.1 </td><td><a href="module.html" class="tocviewlink" data-pltdoc="x">Language Declared in Source</a></td></tr><tr><td align="right">2.2 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Legacy Languages</a></td></tr><tr><td align="right">2.3 </td><td><a href="htdp-langs.html" class="tocviewlink" data-pltdoc="x"><span style="font-style: italic">How to Design Programs</span> Teaching Languages</a></td></tr><tr><td align="right">2.4 </td><td><a href="experimental-langs.html" class="tocviewlink" data-pltdoc="x">Other Experimental Languages</a></td></tr><tr><td align="right">2.5 </td><td><a href="output-syntax.html" class="tocviewlink" data-pltdoc="x">Output Printing Styles</a></td></tr></table></div></div></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, "6.7", "../");" 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"> <a href="module.html" title="backward to "2.1 Language Declared in Source"" data-pltdoc="x">← prev</a> <a href="languages.html" title="up to "2 Languages"" data-pltdoc="x">up</a> <a href="htdp-langs.html" title="forward to "2.3 How to Design Programs Teaching Languages"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "scribblings/drracket/drracket.scrbl")" x-source-pkg="drracket" x-part-tag=""legacy"">2.2<tt> </tt><a name="(part._legacy)"></a>Legacy Languages</h4><p>DrRacket supports several historically useful variants of Scheme
without a <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=guide&rel=Module_Syntax.html%23%2528part._hash-lang%2529&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktMod">#lang</span></a> prefix:</p><ul><li><p>The <a name="(idx._(gentag._40._(lib._scribblings/drracket/drracket..scrbl)))"></a><span class="ssansserif">R5RS</span> language contains those
primitives and syntax defined in the R<span style="vertical-align: super; font-size: 80%">5</span>RS Scheme
standard. See the <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=r5rs&rel=r5rs-mod.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">r5rs</span></a> library for details.</p></li><li><p>The <a name="(idx._(gentag._41._(lib._scribblings/drracket/drracket..scrbl)))"></a><span style="font-style: italic">PLT Pretty Big</span> language provides a
language roughly compatible with a language in earlier versions of
DrRacket. It evaluates a program in the same way as <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=eval.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._load%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">load</a></span>,
and it starts by importing the following modules:
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzscheme&rel=index.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzscheme</span></a>, <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=gui&rel=index.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/gui/base</span></a>,
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_class.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/class</span></a>, <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_etc.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/etc</span></a>,
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_file.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/file</span></a>, <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_list.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/list</span></a>,
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_unit.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/unit</span></a>, <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_include.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/include</span></a>,
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_defmacro.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/defmacro</span></a>, <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_pretty.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/pretty</span></a>,
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_string.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/string</span></a>, <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_thread.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/thread</span></a>,
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_math.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/math</span></a>, <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_match.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/match</span></a>, and
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=mzlib&rel=mzlib_shared.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">mzlib/shared</span></a>.</p></li><li><p>The <a name="(idx._(gentag._42._(lib._scribblings/drracket/drracket..scrbl)))"></a><span class="ssansserif">Swindle</span> language starts with the same
bindings as <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?tag=%28mod-path._.%27swindle.%27%29&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">swindle</span></a>, and evaluates the program like
<span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=eval.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._load%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">load</a></span>.</p></li></ul><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"> <a href="module.html" title="backward to "2.1 Language Declared in Source"" data-pltdoc="x">← prev</a> <a href="languages.html" title="up to "2 Languages"" data-pltdoc="x">up</a> <a href="htdp-langs.html" title="forward to "2.3 How to Design Programs Teaching Languages"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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