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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>1&nbsp;Language Model</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="../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,&quot;tocview_0&quot;);">&#9658;</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x"><span style="font-weight: bold">The Racket Reference</span></a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="" class="tocviewselflink" data-pltdoc="x">Language Model</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="notation.html" class="tocviewlink" data-pltdoc="x">Notation for Documentation</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntactic Forms</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="data.html" class="tocviewlink" data-pltdoc="x">Datatypes</a></td></tr><tr><td align="right">5&nbsp;</td><td><a href="structures.html" class="tocviewlink" data-pltdoc="x">Structures</a></td></tr><tr><td align="right">6&nbsp;</td><td><a href="mzlib_class.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">7&nbsp;</td><td><a href="mzlib_unit.html" class="tocviewlink" data-pltdoc="x">Units</a></td></tr><tr><td align="right">8&nbsp;</td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">9&nbsp;</td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">10&nbsp;</td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Control Flow</a></td></tr><tr><td align="right">11&nbsp;</td><td><a href="concurrency.html" class="tocviewlink" data-pltdoc="x">Concurrency and Parallelism</a></td></tr><tr><td align="right">12&nbsp;</td><td><a href="Macros.html" class="tocviewlink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">13&nbsp;</td><td><a href="input-and-output.html" class="tocviewlink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">14&nbsp;</td><td><a href="security.html" class="tocviewlink" data-pltdoc="x">Reflection and Security</a></td></tr><tr><td align="right">15&nbsp;</td><td><a href="os.html" class="tocviewlink" data-pltdoc="x">Operating System</a></td></tr><tr><td align="right">16&nbsp;</td><td><a href="memory.html" class="tocviewlink" data-pltdoc="x">Memory Management</a></td></tr><tr><td align="right">17&nbsp;</td><td><a href="unsafe.html" class="tocviewlink" data-pltdoc="x">Unsafe Operations</a></td></tr><tr><td align="right">18&nbsp;</td><td><a href="running.html" class="tocviewlink" 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,&quot;tocview_1&quot;);">&#9660;</a></td><td>1&nbsp;</td><td><a href="" class="tocviewselflink" data-pltdoc="x">Language Model</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">1.1&nbsp;</td><td><a href="eval-model.html" class="tocviewlink" data-pltdoc="x">Evaluation Model</a></td></tr><tr><td align="right">1.2&nbsp;</td><td><a href="syntax-model.html" class="tocviewlink" data-pltdoc="x">Syntax Model</a></td></tr><tr><td align="right">1.3&nbsp;</td><td><a href="reader.html" class="tocviewlink" data-pltdoc="x">The Reader</a></td></tr><tr><td align="right">1.4&nbsp;</td><td><a href="printing.html" class="tocviewlink" data-pltdoc="x">The Printer</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, &quot;6.1&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;6.1&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<a href="index.html" title="backward to &quot;The Racket Reference&quot;" data-pltdoc="x">&larr; prev</a>&nbsp;&nbsp;<a href="index.html" title="up to &quot;The Racket Reference&quot;" data-pltdoc="x">up</a>&nbsp;&nbsp;<a href="eval-model.html" title="forward to &quot;1.1 Evaluation Model&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div><h3 x-source-module="(lib &quot;scribblings/reference/reference.scrbl&quot;)" x-part-tag="&quot;model&quot;">1<tt>&nbsp;</tt><a name="(part._model)"></a>Language Model</h3><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html" class="toclink" data-pltdoc="x">1.1<span class="hspace">&nbsp;</span>Evaluation Model</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._cont-model%29" class="toclink" data-pltdoc="x">1.1.1<span class="hspace">&nbsp;</span>Sub-expression Evaluation and Continuations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._.Tail_.Position%29" class="toclink" data-pltdoc="x">1.1.2<span class="hspace">&nbsp;</span>Tail Position</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._values-model%29" class="toclink" data-pltdoc="x">1.1.3<span class="hspace">&nbsp;</span>Multiple Return Values</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._.Top-.Level_.Variables%29" class="toclink" data-pltdoc="x">1.1.4<span class="hspace">&nbsp;</span>Top-Level Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._.Objects_and_.Imperative_.Update%29" class="toclink" data-pltdoc="x">1.1.5<span class="hspace">&nbsp;</span>Objects and Imperative Update</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._model-eq%29" class="toclink" data-pltdoc="x">1.1.6<span class="hspace">&nbsp;</span>Object Identity and Comparisons</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._gc-model%29" class="toclink" data-pltdoc="x">1.1.7<span class="hspace">&nbsp;</span>Garbage Collection</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._.Procedure_.Applications_and_.Local_.Variables%29" class="toclink" data-pltdoc="x">1.1.8<span class="hspace">&nbsp;</span>Procedure Applications and Local Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._.Variables_and_.Locations%29" class="toclink" data-pltdoc="x">1.1.9<span class="hspace">&nbsp;</span>Variables and Locations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._module-eval-model%29" class="toclink" data-pltdoc="x">1.1.10<span class="hspace">&nbsp;</span>Modules and Module-Level Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._module-phase%29" class="toclink" data-pltdoc="x">1.1.10.1<span class="hspace">&nbsp;</span>Phases</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._separate-compilation%29" class="toclink" data-pltdoc="x">1.1.10.2<span class="hspace">&nbsp;</span>The Separate Compilation Guarantee</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._cross-phase._persistent-modules%29" class="toclink" data-pltdoc="x">1.1.10.3<span class="hspace">&nbsp;</span>Cross-Phase Persistent Modules</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._module-redeclare%29" class="toclink" data-pltdoc="x">1.1.10.4<span class="hspace">&nbsp;</span>Module Redeclarations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._submodules%29" class="toclink" data-pltdoc="x">1.1.10.5<span class="hspace">&nbsp;</span>Submodules</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._mark-model%29" class="toclink" data-pltdoc="x">1.1.11<span class="hspace">&nbsp;</span>Continuation Frames and Marks</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._prompt-model%29" class="toclink" data-pltdoc="x">1.1.12<span class="hspace">&nbsp;</span>Prompts, Delimited Continuations, and Barriers</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._thread-model%29" class="toclink" data-pltdoc="x">1.1.13<span class="hspace">&nbsp;</span>Threads</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._parameter-model%29" class="toclink" data-pltdoc="x">1.1.14<span class="hspace">&nbsp;</span>Parameters</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._exn-model%29" class="toclink" data-pltdoc="x">1.1.15<span class="hspace">&nbsp;</span>Exceptions</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="eval-model.html#%28part._custodian-model%29" class="toclink" data-pltdoc="x">1.1.16<span class="hspace">&nbsp;</span>Custodians</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html" class="toclink" data-pltdoc="x">1.2<span class="hspace">&nbsp;</span>Syntax Model</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._id-model%29" class="toclink" data-pltdoc="x">1.2.1<span class="hspace">&nbsp;</span>Identifiers and Binding</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._stxobj-model%29" class="toclink" data-pltdoc="x">1.2.2<span class="hspace">&nbsp;</span>Syntax Objects</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._expansion%29" class="toclink" data-pltdoc="x">1.2.3<span class="hspace">&nbsp;</span>Expansion (Parsing)</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._fully-expanded%29" class="toclink" data-pltdoc="x">1.2.3.1<span class="hspace">&nbsp;</span>Fully Expanded Programs</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._expand-steps%29" class="toclink" data-pltdoc="x">1.2.3.2<span class="hspace">&nbsp;</span>Expansion Steps</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._expand-context-model%29" class="toclink" data-pltdoc="x">1.2.3.3<span class="hspace">&nbsp;</span>Expansion Context</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._intro-binding%29" class="toclink" data-pltdoc="x">1.2.3.4<span class="hspace">&nbsp;</span>Introducing Bindings</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._transformer-model%29" class="toclink" data-pltdoc="x">1.2.3.5<span class="hspace">&nbsp;</span>Transformer Bindings</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._partial-expansion%29" class="toclink" data-pltdoc="x">1.2.3.6<span class="hspace">&nbsp;</span>Partial Expansion</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._intdef-body%29" class="toclink" data-pltdoc="x">1.2.3.7<span class="hspace">&nbsp;</span>Internal Definitions</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._mod-parse%29" class="toclink" data-pltdoc="x">1.2.3.8<span class="hspace">&nbsp;</span>Module Phases and Visits</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._macro-introduced-bindings%29" class="toclink" data-pltdoc="x">1.2.3.9<span class="hspace">&nbsp;</span>Macro-Introduced Bindings</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._compilation-model%29" class="toclink" data-pltdoc="x">1.2.4<span class="hspace">&nbsp;</span>Compilation</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._namespace-model%29" class="toclink" data-pltdoc="x">1.2.5<span class="hspace">&nbsp;</span>Namespaces</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._infernames%29" class="toclink" data-pltdoc="x">1.2.6<span class="hspace">&nbsp;</span>Inferred Value Names</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="syntax-model.html#%28part._cross-phase._persistent-grammar%29" class="toclink" data-pltdoc="x">1.2.7<span class="hspace">&nbsp;</span>Cross-Phase Persistent Module Declarations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="reader.html" class="toclink" data-pltdoc="x">1.3<span class="hspace">&nbsp;</span>The Reader</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="printing.html" class="toclink" data-pltdoc="x">1.4<span class="hspace">&nbsp;</span>The Printer</a></p></td></tr></table><div class="navsetbottom"><span class="navleft"><form 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