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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><meta name="viewport" content="width=device-width, initial-scale=0.8"/><title>23.2 Standards</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">The Racket Guide</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="intro.html" class="tocviewlink" data-pltdoc="x">Welcome to Racket</a></td></tr><tr><td align="right">2 </td><td><a href="to-scheme.html" class="tocviewlink" data-pltdoc="x">Racket Essentials</a></td></tr><tr><td align="right">3 </td><td><a href="datatypes.html" class="tocviewlink" data-pltdoc="x">Built-<wbr></wbr>In Datatypes</a></td></tr><tr><td align="right">4 </td><td><a href="scheme-forms.html" class="tocviewlink" data-pltdoc="x">Expressions and Definitions</a></td></tr><tr><td align="right">5 </td><td><a href="define-struct.html" class="tocviewlink" data-pltdoc="x">Programmer-<wbr></wbr>Defined Datatypes</a></td></tr><tr><td align="right">6 </td><td><a href="modules.html" class="tocviewlink" data-pltdoc="x">Modules</a></td></tr><tr><td align="right">7 </td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">8 </td><td><a href="i_o.html" class="tocviewlink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">9 </td><td><a href="regexp.html" class="tocviewlink" data-pltdoc="x">Regular Expressions</a></td></tr><tr><td align="right">10 </td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Exceptions and Control</a></td></tr><tr><td align="right">11 </td><td><a href="for.html" class="tocviewlink" data-pltdoc="x">Iterations and Comprehensions</a></td></tr><tr><td align="right">12 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">13 </td><td><a href="classes.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">14 </td><td><a href="units.html" class="tocviewlink" data-pltdoc="x">Units</a></td></tr><tr><td align="right">15 </td><td><a href="reflection.html" class="tocviewlink" data-pltdoc="x">Reflection and Dynamic Evaluation</a></td></tr><tr><td align="right">16 </td><td><a href="macros.html" class="tocviewlink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">17 </td><td><a href="languages.html" class="tocviewlink" data-pltdoc="x">Creating Languages</a></td></tr><tr><td align="right">18 </td><td><a href="concurrency.html" class="tocviewlink" data-p
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R<span style="vertical-align: super; font-size: 80%">6</span>RS.</p><h5 x-source-module="(lib "scribblings/guide/guide.scrbl")" x-source-pkg="racket-doc" x-part-tag=""r5rs"">23.2.1<tt> </tt><a name="(part._r5rs)"></a>R<span style="vertical-align: super; font-size: 80%">5</span>RS</h5><p>“R<span style="vertical-align: super; font-size: 80%">5</span>RS” stands for <a href="https://docs.racket-lang.org/r5rs/r5rs-std/index.html">The
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Revised<span style="vertical-align: super; font-size: 80%">5</span> Report on the Algorithmic Language Scheme</a>, and
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it is currently the most widely implemented Scheme standard.</p><p>Racket tools in their default modes do not conform to R<span style="vertical-align: super; font-size: 80%">5</span>RS,
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mainly because Racket tools generally expect modules, and R<span style="vertical-align: super; font-size: 80%">5</span>RS
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does not define a module system. Typical single-file R<span style="vertical-align: super; font-size: 80%">5</span>RS programs
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can be converted to Racket programs by prefixing them with
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<a href="Module_Syntax.html#%28part._hash-lang%29" class="RktModLink" data-pltdoc="x"><span class="RktMod">#lang</span></a><span class="stt"> </span><a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=r5rs&rel=r5rs-mod.html&version=8.6" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">r5rs</span></a>, but other Scheme
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systems do not recognize <a href="Module_Syntax.html#%28part._hash-lang%29" class="RktModLink" data-pltdoc="x"><span class="RktMod">#lang</span></a><span class="stt"> </span><a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=r5rs&rel=r5rs-mod.html&version=8.6" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">r5rs</span></a>. The <span class="stt">plt-r5rs</span> executable (see
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<a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=r5rs&rel=plt-r5rs.html&version=8.6" class="Sq" data-pltdoc="x"><span class="stt">plt-r5rs</span></a>) more directly
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conforms to the R<span style="vertical-align: super; font-size: 80%">5</span>RS standard.</p><p>Aside from the module system, the syntactic forms and functions of
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R<span style="vertical-align: super; font-size: 80%">5</span>RS and Racket differ. Only simple R<span style="vertical-align: super; font-size: 80%">5</span>RS become Racket
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programs when prefixed with <a href="Module_Syntax.html#%28part._hash-lang%29" class="RktModLink" data-pltdoc="x"><span class="RktMod">#lang</span></a><span class="stt"> </span><span class="RktSym">racket</span>, and
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relatively few Racket programs become R<span style="vertical-align: super; font-size: 80%">5</span>RS programs when a
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<a href="Module_Syntax.html#%28part._hash-lang%29" class="RktModLink" data-pltdoc="x"><span class="RktMod">#lang</span></a> line is removed. Also, when mixing “R<span style="vertical-align: super; font-size: 80%">5</span>RS modules”
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with Racket modules, beware that R<span style="vertical-align: super; font-size: 80%">5</span>RS pairs correspond to
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Racket mutable pairs (as constructed with <span class="RktSym"><a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=reference&rel=mpairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._mcons%2529%2529&version=8.6" class="RktValLink Sq" data-pltdoc="x">mcons</a></span>).</p><p>See <a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=r5rs&rel=index.html&version=8.6" class="Sq" data-pltdoc="x">R5RS: Legacy Scheme</a> for more
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information about running R<span style="vertical-align: super; font-size: 80%">5</span>RS programs with Racket.</p><h5 x-source-module="(lib "scribblings/guide/guide.scrbl")" x-source-pkg="racket-doc" x-part-tag=""R6RS"">23.2.2<tt> </tt><a name="(part._.R6.R.S)"></a>R<span style="vertical-align: super; font-size: 80%">6</span>RS</h5><p>“R<span style="vertical-align: super; font-size: 80%">6</span>RS” stands for <a href="https://docs.racket-lang.org/r6rs/r6rs-std/index.html">The
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Revised<span style="vertical-align: super; font-size: 80%">6</span> Report on the Algorithmic Language Scheme</a>,
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which extends R<span style="vertical-align: super; font-size: 80%">5</span>RS with a module system that is similar to the
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Racket module system.</p><p>When an R<span style="vertical-align: super; font-size: 80%">6</span>RS library or top-level program is prefixed with
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<span class="RktMeta">#!</span><a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=r6rs&rel=r6rs-mod.html&version=8.6" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">r6rs</span></a> (which is valid R<span style="vertical-align: super; font-size: 80%">6</span>RS
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syntax), then it can also be used as a Racket program. This works
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because <span class="RktMeta">#!</span> in Racket is treated as a shorthand
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for <a href="Module_Syntax.html#%28part._hash-lang%29" class="RktModLink" data-pltdoc="x"><span class="RktMod">#lang</span></a> followed by a space, so
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<span class="RktMeta">#!</span><a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=r6rs&rel=r6rs-mod.html&version=8.6" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">r6rs</span></a> selects the
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<a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=r6rs&rel=r6rs-mod.html&version=8.6" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">r6rs</span></a> module language. As with R<span style="vertical-align: super; font-size: 80%">5</span>RS, however, beware
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that the syntactic forms and functions of R<span style="vertical-align: super; font-size: 80%">6</span>RS differ from
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Racket, and R<span style="vertical-align: super; font-size: 80%">6</span>RS pairs are mutable pairs.</p><p>See <a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=r6rs&rel=index.html&version=8.6" class="Sq" data-pltdoc="x">R6RS: Scheme</a> for more
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information about running R<span style="vertical-align: super; font-size: 80%">6</span>RS programs with Racket.</p><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" id="searchbox" type="text" tabindex="1" placeholder="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "8.6", "../");"/></form> <a href="https://docs.racket-lang.org/index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("8.6");">top</a><span class="tocsettoggle"> <a href="javascript:void(0);" title="show/hide table of contents" onclick="TocsetToggle();">contents</a></span></span><span class="navright"> <a href="more-hash-lang.html" title="backward to "23.1 More Rackets"" data-pltdoc="x">← prev</a> <a href="dialects.html" title="up to "23 Dialects of Racket and Scheme"" data-pltdoc="x">up</a> <a href="teaching-langs.html" title="forward to "23.3 Teaching"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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