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Introduction</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-2/c-b-character-syntax.html">2. Syntax</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-3/d-b-evaluation.html">3. Evaluation and Compilation</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-4/e-b-introduction.html">4. Types and Classes</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-5/f-b-generalized-reference.html">5. Data and Control Flow</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-6/g-b-the-loop-facility.html">6. Iteration</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-7/h-b-object-creation-and-initialization.html">7. Objects</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../category/81-structures-dictionary.html">8. Structures</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-9/j-b-condition-system-concepts.html">9. Conditions</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-10/ba-b-symbol-concepts.html">10. Symbols</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-11/bb-b-package-concepts.html">11. Packages</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-12/bc-b-number-concepts.html">12. Numbers</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-13/bd-b-character-concepts.html">13. Characters</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-14/be-b-cons-concepts.html">14. Conses</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-15/bf-b-array-concepts.html">15. Arrays</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-16/bg-b-string-concepts.html">16. Strings</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-17/bh-b-sequence-concepts.html">17. Sequences</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-18/bi-b-hash-table-concepts.html">18. Hash Tables</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-19/bj-b-overview-of-filenames.html">19. Filenames</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-20/ca-b-file-system-concepts.html">20. Files</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-21/cb-b-stream-concepts.html">21. Streams</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-22/cc-b-the-lisp-printer.html">22. Printer</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-23/cd-b-reader-concepts.html">23. Reader</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" aria-expanded="true" href="ce-b-system-construction-concepts.html">24. System Construction</a></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="ce-b-system-construction-concepts.html">24.1 System Construction Concepts</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="../category/242-system-construction-dictionary.html">24.2 System Construction Dictionary</a><button aria-label="Expand sidebar category '24.2 System Construction Dictionary'" type="button" class="clean-btn menu__caret"></button></div></li></ul></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-25/cf-b-the-external-environment.html">25. External Environment</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../environments.html">26. Environments</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../meta-object-protocol.html">27. Meta Object Protocol</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../data-structures.html">28. Data Structures</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../portability/trivial-packages.html">29. Portability</a></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="../dictionary-entries.html">dictionary-entries</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-26/intro.html">Glossary</a></div></li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="../index.html"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">24. System Construction</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">24.1 System Construction Concepts</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>24.1 System Construction Concepts</h1>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="2411-loading">24.1.1 Loading<a href="ce-b-system-construction-concepts.html#2411-loading" class="hash-link" aria-label="Direct link to 24.1.1 Loading" title="Direct link to 24.1.1 Loading"></a></h2>
|
||
<!-- -->
|
||
<p>To <span><b>load</b></span> a <span><i>file</i></span> is to treat its contents as <span><i>code</i></span> and <span><i>execute</i></span> that <span><i>code</i></span>. The <span><i>file</i></span> may contain <span><i>source code</i></span> or <span><i>compiled code</i></span>.</p>
|
||
<p>A <span><i>file</i></span> containing <span><i>source code</i></span> is called a <span><i>source file</i></span>. <em>Loading</em> a <span><i>source file</i></span> is accomplished essentially by sequentially <em>reading</em><sub>2</sub> the <span><i>forms</i></span> in the file, <em>evaluating</em> each immediately after it is <span><i>read</i></span>.</p>
|
||
<p>A <span><i>file</i></span> containing <span><i>compiled code</i></span> is called a <span><i>compiled file</i></span>. <em>Loading</em> a <span><i>compiled file</i></span> is similar to <em>loading</em> a <span><i>source file</i></span>, except that the <span><i>file</i></span> does not contain text but rather an <em>implementation dependent</em> representation of pre-digested <span><i>expressions</i></span> created by the <span><i>compiler</i></span> . Often, a <span><i>compiled file</i></span> can be <em>loaded</em> more quickly than a <span><i>source file</i></span>. See Section 3.2 (Compilation).</p>
|
||
<p>The way in which a <span><i>source file</i></span> is distinguished from a <span><i>compiled file</i></span> is <span><i>implementation-dependent</i></span>.</p>
|
||
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="2412-features">24.1.2 Features<a href="ce-b-system-construction-concepts.html#2412-features" class="hash-link" aria-label="Direct link to 24.1.2 Features" title="Direct link to 24.1.2 Features"></a></h2>
|
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|
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<p>A <span><i>feature</i></span> is an aspect or attribute of Common Lisp, of the <span><i>implementation</i></span>, or of the <span><i>environment</i></span>. A <span><i>feature</i></span> is identified by a <span><i>symbol</i></span>.</p>
|
||
<p>A <span><i>feature</i></span> is said to be <span><i>present</i></span> in a <em>Lisp image</em> if and only if the <span><i>symbol</i></span> naming it is an <span><i>element</i></span> of the <span><i>list</i></span> held by the <span><i>variable</i></span> <span><b>*features*</b></span>, which is called the <span><i>features list</i></span>.</p>
|
||
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="24121-feature-expressions">24.1.2.1 Feature Expressions<a href="ce-b-system-construction-concepts.html#24121-feature-expressions" class="hash-link" aria-label="Direct link to 24.1.2.1 Feature Expressions" title="Direct link to 24.1.2.1 Feature Expressions"></a></h3>
|
||
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|
||
<p>Boolean combinations of <span><i>features</i></span>, called <span><i>feature expressions</i></span>, are used by the #+ and #- <span><i>reader macros</i></span> in order to direct conditional <em>reading</em> of <span><i>expressions</i></span> by the <em>Lisp reader</em> .</p>
|
||
<p>The rules for interpreting a <span><i>feature expression</i></span> are as follows:</p>
|
||
<span><i>feature</i></span>
|
||
<p>If a <span><i>symbol</i></span> naming a <span><i>feature</i></span> is used as a <span><i>feature expression</i></span>, the <span><i>feature expression</i></span> succeeds if that <span><i>feature</i></span> is <span><i>present</i></span>; otherwise it fails.</p>
|
||
<p>(not <em>feature-conditional</em>)</p>
|
||
<p>A <span><b>not</b></span> <span><i>feature expression</i></span> succeeds if its argument <em>feature-conditional</em> fails; otherwise, it succeeds.</p>
|
||
<p>(and <em>{feature-conditional}</em>*)</p>
|
||
<p>An <span><b>and</b></span> <span><i>feature expression</i></span> succeeds if all of its argument <em>feature-conditionals</em> succeed; otherwise, it fails.</p>
|
||
<p>System</p>
|
||
<p>(or <em>{feature-conditional}</em>*)</p>
|
||
<p>An <span><b>or</b></span> <span><i>feature expression</i></span> succeeds if any of its argument <em>feature-conditionals</em> succeed; otherwise, it fails.</p>
|
||
<h4 class="anchor anchorWithStickyNavbar_LWe7" id="241211-examples-of-feature-expressions">24.1.2.1.1 Examples of Feature Expressions<a href="ce-b-system-construction-concepts.html#241211-examples-of-feature-expressions" class="hash-link" aria-label="Direct link to 24.1.2.1.1 Examples of Feature Expressions" title="Direct link to 24.1.2.1.1 Examples of Feature Expressions"></a></h4>
|
||
<!-- -->
|
||
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|
||
<p>For example, suppose that in <span><i>implementation</i></span> A, the <span><i>features</i></span> spice and perq are <span><i>present</i></span>, but the <span><i>feature</i></span> lispm is not <span><i>present</i></span>; in <span><i>implementation</i></span> B, the feature lispm is <span><i>present</i></span>, but the <span><i>features</i></span> spice and perq are not <span><i>present</i></span>; and in <span><i>implementation</i></span> C, none of the features spice, <em>lispm</em>, or perq are <span><i>present</i></span>. Figure 24–1 shows some sample <span><i>expressions</i></span>, and how they would be <span><i>read</i></span> <sub>2</sub> in these <span><i>implementations</i></span>.</p>
|
||
<div class="language-lisp codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockTitle_Ktv7">Figure 24–1. Features examples</div><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-lisp codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain"><p></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">cons</span><span class="token plain"> #+spice </span><span class="token string" style="color:#e3116c">"Spice"</span><span class="token plain"> #-spice </span><span class="token string" style="color:#e3116c">"Lispm"</span><span class="token plain"> x</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* A *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Spice"</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* B *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Lispm"</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* C *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Lispm"</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">cons</span><span class="token plain"> #+spice </span><span class="token string" style="color:#e3116c">"Spice"</span><span class="token plain"> #+LispM </span><span class="token string" style="color:#e3116c">"Lispm"</span><span class="token plain"> x</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* A *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Spice"</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* B *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Lispm"</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* C *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">setq</span><span class="token plain"> a ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> #+perq </span><span class="token number" style="color:#36acaa">43</span><span class="token plain"> #+</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">not</span><span class="token plain"> perq</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">27</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* A *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">SETQ</span><span class="token plain"> A ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">43</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* B *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">SETQ</span><span class="token plain"> A ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">27</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* C *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">SETQ</span><span class="token plain"> A ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">27</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">let</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">a</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> #+</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">or</span><span class="token plain"> spice lispm</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">b</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">foo</span><span class="token plain"> a</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* A *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">LET</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">A</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">B</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">FOO</span><span class="token plain"> A</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* B *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">LET</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">A</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">B</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">FOO</span><span class="token plain"> A</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* C *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">LET</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">A</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">FOO</span><span class="token plain"> A</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p></span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">cons</span><span class="token plain"> #+Lispm </span><span class="token string" style="color:#e3116c">"#+Spice"</span><span class="token plain"> #+Spice </span><span class="token string" style="color:#e3116c">"foo"</span><span class="token plain"> #-</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">or</span><span class="token plain"> Lispm Spice</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">7</span><span class="token plain"> x</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* A *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"foo"</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* B *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"#+Spice"</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </p><p>in *implementation* C *. </span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> .* </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">CONS</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">7</span><span class="token plain"> X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></p></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a 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