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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>18.8 Kernel Forms and Functions</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">The Racket Reference</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="tocviewlink" 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="tocviewselflink" 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>18 </td><td><a href="running.html" class="tocviewlink" data-pltdoc="x">Running Racket</a></td></tr></table><div class="tocviewsublist" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">18.1 </td><td><a href="running-sa.html" class="tocviewlink" data-pltdoc="x">Running Racket or GRacket</a></td></tr><tr><td align="right">18.2 </td><td><a href="collects.html" class="tocviewlink" data-pltdoc="x">Libraries and Collections</a></td></tr><tr><td align="right">18.3 </td><td><a href="Interactive_Help.html" class="tocviewlink" data-pltdoc="x">Interactive Help</a></td></tr><tr><td align="right">18.4 </td><td><a href="interaction-info.html" class="tocviewlink" data-pltdoc="x">Interaction Configuration</a></td></tr><tr><td align="right">18.5 </td><td><a href="interactive.html" class="tocviewlink" data-pltdoc="x">Interactive Module Loading</a></td></tr><tr><td align="right">18.6 </td><td><a href="debugging.html" class="tocviewlink" data-pltdoc="x">Debugging</a></td></tr><tr><td align="right">18.7 </td><td><a href="compiler.html" class="tocviewlink" data-pltdoc="x">Controlling and Inspecting Compilation</a></td></tr><tr><td align="right">18.8 </td><td><a href="Kernel_Forms_and_Functions.html" class="tocviewselflink" data-pltdoc="x">Kernel Forms and Functions</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;">•</td><td>18.8 </td><td><a href="Kernel_Forms_and_Functions.html" class="tocviewselflink" data-pltdoc="x">Kernel Forms and Functions</a></td></tr></table></div></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">8.6</span></div><div class="navsettop"><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="compiler.html" title="backward to "18.7 Controlling and Inspecting Compilation"" data-pltdoc="x">← prev</a> <a href="running.html" title="up to "18 Running Racket"" data-pltdoc="x">up</a> <a href="doc-bibliography.html" title="forward to "Bibliography"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-source-pkg="racket-doc" x-part-tag=""Kernel_Forms_and_Functions"">18.8<tt> </tt><a name="(part._.Kernel_.Forms_and_.Functions)"></a><a name="(mod-path._racket/kernel)"></a>Kernel Forms and Functions</h4><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=guide&rel=Module_Syntax.html%23%2528part._hash-lang%2529&version=8.6" class="RktModLink Sq" data-pltdoc="x"><span class="RktMod">#lang</span></a><span class="hspace"> </span><a href="Kernel_Forms_and_Functions.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel</span></a></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <a href="https://pkgs.racket-lang.org/package/base" title="Install this package using `raco pkg install base`"><span class="stt">base</span></a></span></td></tr></table></div><div class="SIntrapara">The <a href="Kernel_Forms_and_Functions.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel</span></a> library
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is a <a href="eval-model.html#%28tech._cross._phase._persistent%29" class="techoutside" data-pltdoc="x"><span class="techinside">cross-phase persistent</span></a> module that provides a minimal set of syntactic
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forms and functions.</div></p><p>“Minimal” means that <a href="Kernel_Forms_and_Functions.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel</span></a> includes only
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forms that are built into the Racket compiler and only functions that
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are built into the run-time system. Currently, the set of bindings is
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not especially small, nor is it particularly well-defined, since the
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set of built-in functions can change frequently. Use
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<a href="Kernel_Forms_and_Functions.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel</span></a> with care, and beware that its use can
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create compatibility problems.</p><p>The <a href="Kernel_Forms_and_Functions.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel</span></a> module exports all of the bindings in the
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grammar of fully expanded programs (see <a href="syntax-model.html#%28part._fully-expanded%29" data-pltdoc="x">Fully Expanded Programs</a>),
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but it provides <span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25plain-lambda%29%29" class="RktStxLink" data-pltdoc="x">#%plain-lambda</a></span> as <span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25plain-lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span> and <span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25plain-lambda%29%29" class="RktStxLink" data-pltdoc="x">λ</a></span>,
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<span class="RktSym"><a href="application.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25plain-app%29%29" class="RktStxLink" data-pltdoc="x">#%plain-app</a></span> as <span class="RktSym"><a href="application.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25plain-app%29%29" class="RktStxLink" data-pltdoc="x">#%app</a></span>, and
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<span class="RktSym"><a href="module.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25plain-module-begin%29%29" class="RktStxLink" data-pltdoc="x">#%plain-module-begin</a></span> as <span class="RktSym"><a href="module.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25plain-module-begin%29%29" class="RktStxLink" data-pltdoc="x">#%module-begin</a></span>. Aside from
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<span class="RktSym"><a href="quote.html#%28form._%28%28quote._~23~25kernel%29._~23~25datum%29%29" class="RktStxLink" data-pltdoc="x">#%datum</a></span> (which expands to <span class="RktSym"><a href="quote.html#%28form._%28%28quote._~23~25kernel%29._quote%29%29" class="RktStxLink" data-pltdoc="x">quote</a></span>),
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<a href="Kernel_Forms_and_Functions.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel</span></a> provides no other syntactic bindings.</p><p>The <a href="Kernel_Forms_and_Functions.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel</span></a> module also exports many of the function
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bindings from <a href="index.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/base</span></a>, and it exports a few other
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functions that are not exported by <a href="index.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/base</span></a> because
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<a href="index.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/base</span></a> exports improved variants. The exact set
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of function bindings exported by <span class="RktSym">racket/kernel</span> is unspecified
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and subject to change across versions.</p><a name="(part._)"></a><a name="(mod-path._racket/kernel/init)"></a><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="Kernel_Forms_and_Functions.html#%28mod-path._racket%2Fkernel%2Finit%29" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel/init</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <a href="https://pkgs.racket-lang.org/package/base" title="Install this package using `raco pkg install base`"><span class="stt">base</span></a></span></td></tr></table></div><div class="SIntrapara">The <a href="Kernel_Forms_and_Functions.html#%28mod-path._racket%2Fkernel%2Finit%29" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel/init</span></a>
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library re-provides all of <a href="Kernel_Forms_and_Functions.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel</span></a>. It also
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provides <span class="RktSym"><a href="__top-interaction.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25top-interaction%29%29" class="RktStxLink" data-pltdoc="x">#%top-interaction</a></span>, which makes
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<a href="Kernel_Forms_and_Functions.html#%28mod-path._racket%2Fkernel%2Finit%29" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/kernel/init</span></a> useful with the <span class="nobreak"><span class="stt">-I</span></span>
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command-line flag for <span class="stt">racket</span>.</div></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="compiler.html" title="backward to "18.7 Controlling and Inspecting Compilation"" data-pltdoc="x">← prev</a> <a href="running.html" title="up to "18 Running Racket"" data-pltdoc="x">up</a> <a href="doc-bibliography.html" title="forward to "Bibliography"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html> |