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docSidebarContainer_YfHR"><div class="sidebarViewport_aRkj"><div class="sidebar_njMd"><nav aria-label="Docs sidebar" class="menu thin-scrollbar menu_SIkG"><ul class="theme-doc-sidebar-menu menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="../../index.html">Introduction</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-0/intro.html">Contents and Figures</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-1/b-b-scope-purpose-and-history.html">1. 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"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" aria-expanded="true" href="../j-b-condition-system-concepts.html">9. Conditions</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" tabindex="0" href="../j-b-condition-system-concepts.html">9.1 Condition System Concepts</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--active" aria-expanded="true" tabindex="0" href="../../category/92-conditions-dictionary.html">9.2 Conditions Dictionary</a><button aria-label="Collapse sidebar category '9.2 Conditions Dictionary'" type="button" class="clean-btn menu__caret"></button></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-3 menu__list-item"><a class="menu__link" tabindex="0" href="assert_macro.html">assert</a></li><li 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class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="error_function.html">error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="find-restart_function.html">find-restart</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="handler-bind_macro.html">handler-bind</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="handler-case_macro.html">handler-case</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="ignore-errors_macro.html">ignore-errors</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="invalid-method-error_function.html">invalid-method-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="invoke-debugger_function.html">invoke-debugger</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="invoke-restart-interactively_function.html">invoke-restart-interactively</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="invoke-restart_function.html">invoke-restart</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="make-condition_function.html">make-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="method-combination-error_function.html">method-combination-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="parse-error_condition-type.html">parse-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="restart-bind_macro.html">restart-bind</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="restart-case_macro.html">restart-case</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="restart-name_function.html">restart-name</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="restart_system-class.html">restart</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="serious-condition_condition-type.html">serious-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="signal_function.html">signal</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="simple-condition_condition-type.html">simple-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="simple-error_condition-type.html">simple-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="simple-warning_condition-type.html">simple-warning</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="storage-condition_condition-type.html">storage-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="style-warning_condition-type.html">style-warning</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="warn_function.html">warn</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="warning_condition-type.html">warning</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="with-condition-restarts_macro.html">with-condition-restarts</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="with-simple-restart_macro.html">with-simple-restart</a></li></ul></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-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 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-24/ce-b-system-construction-concepts.html">24. System Construction</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-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">9. Conditions</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="../../category/92-conditions-dictionary.html"><span itemprop="name">9.2 Conditions Dictionary</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">restart-case</span><meta itemprop="position" content="3"></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>restart-case</h1>
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<!-- -->
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<!-- -->
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<p><strong>restart-case</strong> <span><i>Macro</i></span></p>
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<p><strong>Syntax:</strong></p>
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<p><span><b>restart-case</b></span> <em>restartable-form {↓clause} → {result}</em>*</p>
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<p><em>clause::</em>=(<em>case-name lambda-list</em></p>
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<p>[[ <!-- -->:interactive<!-- --> <em>interactive-expression |</em> <!-- -->:report<!-- --> <em>report-expression |</em> <!-- -->:test<!-- --> <em>test-expression</em> ]] <span><i>{declaration}</i></span>* <span><i>{form}</i></span>*)</p>
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<p><strong>Arguments and Values:</strong></p>
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<p><em>restartable-form</em>—a <span><i>form</i></span>.</p>
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<p><em>case-name</em>—a <span><i>symbol</i></span> or <span><b>nil</b></span>.</p>
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<p><em>lambda-list</em>—an <span><i>ordinary lambda list</i></span>.</p>
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<p><em>interactive-expression</em>—a <span><i>symbol</i></span> or a <span><i>lambda expression</i></span>.</p>
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<p><em>report-expression</em>—a <span><i>string</i></span>, a <span><i>symbol</i></span>, or a <span><i>lambda expression</i></span>.</p>
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<p><em>test-expression</em>—a <span><i>symbol</i></span> or a <span><i>lambda expression</i></span>.</p>
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<p><span><i>declaration</i></span>—a <span><b>declare</b></span> <span><i>expression</i></span>; not evaluated.</p>
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<p><span><i>form</i></span>—a <span><i>form</i></span>.</p>
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<p><em>results</em>—the <span><i>values</i></span> resulting from the <span><i>evaluation</i></span> of <em>restartable-form</em>, or the <span><i>values</i></span> returned by the last <span><i>form</i></span> executed in a chosen <em>clause</em>, or <span><b>nil</b></span>.</p>
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<p><strong>Description:</strong></p>
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<p><span><b>restart-case</b></span> evaluates <em>restartable-form</em> in a <span><i>dynamic environment</i></span> where the clauses have special meanings as points to which control may be transferred. If <em>restartable-form</em> finishes executing and returns any values, all values returned are returned by <span><b>restart-case</b></span> and processing has completed. While <em>restartable-form</em> is executing, any code may transfer control to one of the clauses (see</p>
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<span><b>restart-case</b></span>
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<p><span><b>invoke-restart</b></span>). If a transfer occurs, the forms in the body of that clause is evaluated and any values returned by the last such form are returned by <span><b>restart-case</b></span>. In this case, the dynamic state is unwound appropriately (so that the restarts established around the <em>restartable-form</em> are no longer active) prior to execution of the clause.</p>
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<p>If there are no <span><i>forms</i></span> in a selected clause, <span><b>restart-case</b></span> returns <span><b>nil</b></span>.</p>
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<p>If <em>case-name</em> is a <span><i>symbol</i></span>, it names this restart.</p>
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<p>It is possible to have more than one clause use the same <em>case-name</em>. In this case, the first clause with that name is found by <span><b>find-restart</b></span>. The other clauses are accessible using <span><b>compute-restarts</b></span>.</p>
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<p>Each <em>arglist</em> is an <span><i>ordinary lambda list</i></span> to be bound during the execution of its corresponding <span><i>forms</i></span>. These parameters are used by the <span><b>restart-case</b></span> clause to receive any necessary data from a call to <span><b>invoke-restart</b></span>.</p>
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<p>By default, <span><b>invoke-restart-interactively</b></span> passes no arguments and all arguments must be optional in order to accomodate interactive restarting. However, the arguments need not be optional if the <!-- -->:interactive<!-- --> keyword has been used to inform <span><b>invoke-restart-interactively</b></span> about how to compute a proper argument list.</p>
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<p><span><i>Keyword</i></span> options have the following meaning.</p>
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<p>:interactive</p>
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<p>The <span><i>value</i></span> supplied by <!-- -->:interactive<!-- --> <span><i>value</i></span> must be a suitable argument to <span><b>function</b></span>. (function <span><i>value</i></span>) is evaluated in the current lexical environment. It should return a <span><i>function</i></span> of no arguments which returns arguments to be used by <span><b>invoke-restart-interactively</b></span> when it is invoked. <span><b>invoke-restart-interactively</b></span> is called in the dynamic environment available prior to any restart attempt, and uses <em>query I/O</em> for user interaction.</p>
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<p>If a restart is invoked interactively but no <!-- -->:interactive<!-- --> option was supplied, the argument list used in the invocation is the empty list.</p>
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<p>:report</p>
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<p>If the <span><i>value</i></span> supplied by <!-- -->:report<!-- --> <span><i>value</i></span> is a <span><i>lambda expression</i></span> or a <span><i>symbol</i></span>, it must be acceptable to <span><b>function</b></span>. (function <span><i>value</i></span>) is evaluated in the current lexical environment. It should return a <span><i>function</i></span> of one argument, a <span><i>stream</i></span>, which prints on the <span><i>stream</i></span> a description of the restart. This <span><i>function</i></span> is called whenever the restart is printed while <span><b>*print-escape*</b></span> is <span><b>nil</b></span>.</p>
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<p>If <span><i>value</i></span> is a <span><i>string</i></span>, it is a shorthand for</p>
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<p>(lambda (stream) (write-string value stream))</p>
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<p>If a named restart is asked to report but no report information has been supplied, the name of the restart is used in generating default report text.</p>
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<span><b>restart-case</b></span>
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<p>When <span><b>*print-escape*</b></span> is <span><b>nil</b></span>, the printer uses the report information for a restart. For example, a debugger might announce the action of typing a “continue” command by:</p>
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<p>(format t "~&~S – ~A~%" ’<!-- -->:continue<!-- --> some-restart)</p>
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<p>which might then display as something like:</p>
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<p>:CONTINUE<!-- --> – Return to command level</p>
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<p>The consequences are unspecified if an unnamed restart is specified but no <!-- -->:report<!-- --> option is provided.</p>
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<p>:test</p>
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<p>The <span><i>value</i></span> supplied by <!-- -->:test<!-- --> <span><i>value</i></span> must be a suitable argument to <span><b>function</b></span>.</p>
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<p>(function <span><i>value</i></span>) is evaluated in the current lexical environment. It should return a <span><i>function</i></span> of one <span><i>argument</i></span>, the <span><i>condition</i></span>, that returns <span><i>true</i></span> if the restart is to be considered visible.</p>
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<p>The default for this option is equivalent to (lambda (c) (declare (ignore c)) t).</p>
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<p>If the <em>restartable-form</em> is a <span><i>list</i></span> whose <span><i>car</i></span> is any of the <span><i>symbols</i></span> <span><b>signal</b></span>, <span><b>error</b></span>, <span><b>cerror</b></span>, or <span><b>warn</b></span> (or is a <span><i>macro form</i></span> which macroexpands into such a <span><i>list</i></span>), then <span><b>with-condition-restarts</b></span> is used implicitly to associate the indicated <span><i>restarts</i></span> with the <span><i>condition</i></span> to be signaled.</p>
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<p><strong>Examples:</strong></p>
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<div class="language-lisp codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><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 punctuation" style="color:#393A34">(</span><span class="token car">restart-case</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">handler-bind</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 keyword" style="color:#00009f">error</span><span class="token plain"> #’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token lambda keyword" style="color:#00009f">lambda</span><span class="token lambda"> </span><span class="token lambda punctuation" style="color:#393A34">(</span><span class="token lambda arguments argument variable" style="color:#36acaa">c</span><span class="token lambda punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token declare keyword" style="color:#00009f">declare</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">ignore</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">invoke-restart</span><span class="token plain"> ’my-restart </span><span class="token number" style="color:#36acaa">7</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">error</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Foo."</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">my-restart</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">&optional v</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> v</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ </span><span class="token number" style="color:#36acaa">7</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">define-condition</span><span class="token plain"> food-error </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">error</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 punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ FOOD-ERROR </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">define-condition</span><span class="token plain"> bad-tasting-sundae </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">food-error</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><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">ice-cream</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:ice-cream</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> bad-tasting-sundae-ice-cream</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">sauce</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:sauce</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> bad-tasting-sundae-sauce</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">topping</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:topping</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> bad-tasting-sundae-topping</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lambda keyword" style="color:#00009f">lambda</span><span class="token lambda"> </span><span class="token lambda punctuation" style="color:#393A34">(</span><span class="token lambda arguments argument variable" style="color:#36acaa">condition</span><span class="token lambda arguments"> </span><span class="token lambda arguments argument variable" style="color:#36acaa">stream</span><span class="token lambda punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">format</span><span class="token plain"> stream </span><span class="token string" style="color:#e3116c">"Bad tasting sundae with ~</span><span class="token string argument" style="color:#e3116c">S</span><span class="token string" style="color:#e3116c">, ~</span><span class="token string argument" style="color:#e3116c">S</span><span class="token string" style="color:#e3116c">, and ~S"</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">bad-tasting-sundae-ice-cream</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">bad-tasting-sundae-sauce</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">bad-tasting-sundae-topping</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ BAD-TASTING-SUNDAE </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token defun keyword" style="color:#00009f">defun</span><span class="token defun"> </span><span class="token defun function" style="color:#d73a49">all-start-with-same-letter</span><span class="token defun"> </span><span class="token defun punctuation" style="color:#393A34">(</span><span class="token defun arguments argument variable" style="color:#36acaa">symbol1</span><span class="token defun arguments"> </span><span class="token defun arguments argument variable" style="color:#36acaa">symbol2</span><span class="token defun arguments"> </span><span class="token defun arguments argument variable" style="color:#36acaa">symbol3</span><span class="token defun punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> **restart-case** </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </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">first-letter</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">char</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">symbol-name</span><span class="token plain"> symbol1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">and</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">eql</span><span class="token plain"> first-letter </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">char</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">symbol-name</span><span class="token plain"> symbol2</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">eql</span><span class="token plain"> first-letter </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">char</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">symbol-name</span><span class="token plain"> symbol3</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ ALL-START-WITH-SAME-LETTER </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token defun keyword" style="color:#00009f">defun</span><span class="token defun"> </span><span class="token defun function" style="color:#d73a49">read-new-value</span><span class="token defun"> </span><span class="token defun punctuation" style="color:#393A34">(</span><span class="token defun arguments"></span><span class="token defun punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">format</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">t</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Enter a new value: "</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">multiple-value-list</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">eval</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">read</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ READ-NEW-VALUE </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">**restart-case** </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token defun keyword" style="color:#00009f">defun</span><span class="token defun"> </span><span class="token defun function" style="color:#d73a49">verify-or-fix-perfect-sundae</span><span class="token defun"> </span><span class="token defun punctuation" style="color:#393A34">(</span><span class="token defun arguments argument variable" style="color:#36acaa">ice-cream</span><span class="token defun arguments"> </span><span class="token defun arguments argument variable" style="color:#36acaa">sauce</span><span class="token defun arguments"> </span><span class="token defun arguments argument variable" style="color:#36acaa">topping</span><span class="token defun 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">do</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 plain"> </span><br></span><span class="token-line" style="color:#393A34"><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">all-start-with-same-letter</span><span class="token plain"> ice-cream sauce topping</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">restart-case</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">error</span><span class="token plain"> ’bad-tasting-sundae </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:ice-cream</span><span class="token plain"> ice-cream </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:sauce</span><span class="token plain"> sauce </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:topping</span><span class="token plain"> topping</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">use-new-ice-cream</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">new-ice-cream</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Use a new ice cream."</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:interactive</span><span class="token plain"> read-new-value </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">setq</span><span class="token plain"> ice-cream new-ice-cream</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">use-new-sauce</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">new-sauce</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Use a new sauce."</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:interactive</span><span class="token plain"> read-new-value </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">setq</span><span class="token plain"> sauce new-sauce</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">use-new-topping</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">new-topping</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Use a new topping."</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:interactive</span><span class="token plain"> read-new-value </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">setq</span><span class="token plain"> topping new-topping</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">values</span><span class="token plain"> ice-cream sauce topping</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ VERIFY-OR-FIX-PERFECT-SUNDAE </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">verify-or-fix-perfect-sundae</span><span class="token plain"> ’vanilla ’caramel ’cherry</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> ▷ Error: Bad tasting sundae with VANILLA, CARAMEL, and CHERRY. ▷ To continue, type </span><span class="token lisp-property property" style="color:#36acaa">:CONTINUE</span><span class="token plain"> followed by an option number: ▷ 1: Use a new ice cream. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">▷ 2: Use a new sauce. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">▷ 3: Use a new topping. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">▷ 4: Return to Lisp Toplevel. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">▷ Debug> </span><span class="token lisp-property property" style="color:#36acaa">:continue</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">▷ Use a new ice cream. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">▷ Enter a new ice cream: ’chocolate </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ CHOCOLATE, CARAMEL, CHERRY </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>
|
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<p><strong>See Also:</strong></p>
|
||
<p><span><b>restart-bind</b></span>, <span><b>with-simple-restart</b></span>.</p>
|
||
<p><strong>Notes:</strong></p>
|
||
<p>(restart-case <span><i>expression</i></span></p>
|
||
<p>(<em>name1 arglist1</em> ...<em>options1</em>... . <em>body1</em>)</p>
|
||
<p>(<em>name2 arglist2</em> ...<em>options2</em>... . <em>body2</em>))</p>
|
||
<p>is essentially equivalent to</p>
|
||
<p>(block #1=#<!-- -->:g0001</p>
|
||
<p>(let ((#2=#<!-- -->:g0002<!-- --> nil))</p>
|
||
<p>(tagbody</p>
|
||
<p>(restart-bind ((name1 #’(lambda (&rest temp)</p>
|
||
<p>(setq #2# temp)</p>
|
||
<p>(go #3=#<!-- -->:g0003<!-- -->))</p>
|
||
<p>...<em>slightly-transformed-options1</em>...)</p>
|
||
<p>(name2 #’(lambda (&rest temp)</p>
|
||
<p>(setq #2# temp)</p>
|
||
<p>(go #4=#<!-- -->:g0004<!-- -->))</p>
|
||
<p>...<em>slightly-transformed-options2</em>...))</p>
|
||
<p>(return-from #1# <span><i>expression</i></span>))</p>
|
||
<p>#3# (return-from #1#</p>
|
||
<p>(apply #’(lambda <em>arglist1</em> . <em>body1</em>) #2#))</p>
|
||
<p>#4# (return-from #1#</p>
|
||
<p>(apply #’(lambda <em>arglist2</em> . <em>body2</em>) #2#)))))</p>
|
||
<p>Unnamed restarts are generally only useful interactively and an interactive option which has no description is of little value. Implementations are encouraged to warn if an unnamed restart is used and no report information is provided at compilation time. At runtime, this error might be noticed when entering the debugger. Since signaling an error would probably cause recursive entry into the debugger (causing yet another recursive error, etc.) it is suggested that the debugger print some indication of such problems when they occur but not actually signal errors.</p>
|
||
<p>(restart-case (signal fred)</p>
|
||
<p>(a ...)</p>
|
||
<p>(b ...))</p>
|
||
<p><em>≡</em></p>
|
||
<p>(restart-case</p>
|
||
<p>(with-condition-restarts fred</p>
|
||
<p>(list (find-restart ’a)</p>
|
||
<p>(find-restart ’b))</p>
|
||
<p>(signal fred))</p>
|
||
<p>(a ...)</p>
|
||
<p>(b ...))</p>
|
||
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="expanded-reference-restart-case">Expanded Reference: restart-case<a href="restart-case_macro.html#expanded-reference-restart-case" class="hash-link" aria-label="Direct link to Expanded Reference: restart-case" title="Direct link to Expanded Reference: restart-case"></a></h2>
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<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>TODO: Please contribute to this page by adding explanations and examples</p></div></div>
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<div class="language-lisp codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><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 punctuation" style="color:#393A34">(</span><span class="token car">restart-case</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">)</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 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