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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="351-argument-mismatch-detection">3.5.1 Argument Mismatch Detection<a href="d-f-error-checking-in-function-calls.html#351-argument-mismatch-detection" class="hash-link" aria-label="Direct link to 3.5.1 Argument Mismatch Detection" title="Direct link to 3.5.1 Argument Mismatch Detection">​</a></h2>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="3511-safe-and-unsafe-calls">3.5.1.1 Safe and Unsafe Calls<a href="d-f-error-checking-in-function-calls.html#3511-safe-and-unsafe-calls" class="hash-link" aria-label="Direct link to 3.5.1.1 Safe and Unsafe Calls" title="Direct link to 3.5.1.1 Safe and Unsafe Calls">​</a></h3>
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<p>A <span><i>call</i></span> is a <span><i>safe call</i></span> if each of the following is either <em>safe code</em> or <span><i>system code</i></span> (other than <span><i>system code</i></span> that results from <span><i>macro expansion</i></span> of <span><i>programmer code</i></span>):</p>
<p><em>•</em> the <span><i>call</i></span>.</p>
<p><em>•</em> the definition of the <span><i>function</i></span> being <em>called</em>.</p>
<p><em>•</em> the point of <span><i>functional evaluation</i></span></p>
<p>The following special cases require some elaboration:</p>
<p><em>•</em> If the <span><i>function</i></span> being called is a <span><i>generic function</i></span>, it is considered <span><i>safe</i></span> if all of the following are <em>safe code</em> or <span><i>system code</i></span>:</p>
<p>– its definition (if it was defined explicitly).</p>
<p>– the <span><i>method</i></span> definitions for all <span><i>applicable methods</i></span>.</p>
<p>– the definition of its <span><i>method combination</i></span>.</p>
<p><em>•</em> For the form (coerce <em>x</em> ’function), where <em>x</em> is a <span><i>lambda expression</i></span>, the value of the <span><i>optimize quality</i></span> <strong>safety</strong> in the global environment at the time the <span><b>coerce</b></span> is <em>executed</em> applies to the resulting <span><i>function</i></span>.</p>
<p><em>•</em> For a call to the <span><i>function</i></span> <span><b>ensure-generic-function</b></span>, the value of the <span><i>optimize quality</i></span> <strong>safety</strong> in the <span><i>environment object</i></span> passed as the <!-- -->:environment<!-- --> <span><i>argument</i></span> applies to the resulting <span><i>generic function</i></span>.</p>
<p><em>•</em> For a call to <span><b>compile</b></span> with a <span><i>lambda expression</i></span> as the <span><i>argument</i></span>, the value of the <span><i>optimize quality</i></span> <strong>safety</strong> in the <span><i>global environment</i></span> at the time <span><b>compile</b></span> is <em>called</em> applies to the resulting <span><i>compiled function</i></span>.</p>
<p><em>•</em> For a call to <span><b>compile</b></span> with only one argument, if the original definition of the <span><i>function</i></span> was <span><i>safe</i></span>, then the resulting <span><i>compiled function</i></span> must also be <span><i>safe</i></span>.</p>
<p><em>•</em> A <span><i>call</i></span> to a <span><i>method</i></span> by <span><b>call-next-method</b></span> must be considered <span><i>safe</i></span> if each of the following is <em>safe code</em> or <span><i>system code</i></span>:</p>
<p>– the definition of the <span><i>generic function</i></span> (if it was defined explicitly).</p>
<p>– the <span><i>method</i></span> definitions for all <span><i>applicable methods</i></span>.</p>
<p>– the definition of the <span><i>method combination</i></span>.</p>
<p>– the point of entry into the body of the <em>method defining form</em>, where the <span><i>binding</i></span> of <span><b>call-next-method</b></span> is established.</p>
<p>– the point of <span><i>functional evaluation</i></span> of the name <span><b>call-next-method</b></span>.</p>
<p>An <span><i>unsafe call</i></span> is a <span><i>call</i></span> that is not a <span><i>safe call</i></span>.</p>
<p>The informal intent is that the <span><i>programmer</i></span> can rely on a <span><i>call</i></span> to be <span><i>safe</i></span>, even when <span><i>system code</i></span> is involved, if all reasonable steps have been taken to ensure that the <span><i>call</i></span> is <span><i>safe</i></span>. For example, if a <span><i>programmer</i></span> calls <span><b>mapcar</b></span> from <em>safe code</em> and supplies a <span><i>function</i></span> that was <em>compiled</em> as <span><i>safe</i></span>, the <span><i>implementation</i></span> is required to ensure that <span><b>mapcar</b></span> makes a <span><i>safe call</i></span> as well.</p>
<h4 class="anchor anchorWithStickyNavbar_LWe7" id="35111-error-detection-time-in-safe-calls">3.5.1.1.1 Error Detection Time in Safe Calls<a href="d-f-error-checking-in-function-calls.html#35111-error-detection-time-in-safe-calls" class="hash-link" aria-label="Direct link to 3.5.1.1.1 Error Detection Time in Safe Calls" title="Direct link to 3.5.1.1.1 Error Detection Time in Safe Calls">​</a></h4>
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<p>If an error is signaled in a <span><i>safe call</i></span>, the exact point of the <span><i>signal</i></span> is <span><i>implementation-dependent</i></span>. In particular, it might be signaled at compile time or at run time, and if signaled at run time, it might be prior to, during, or after <em>executing</em> the <span><i>call</i></span>. However, it is always prior to the execution of the body of the <span><i>function</i></span> being <em>called</em>.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="3512-too-few-arguments">3.5.1.2 Too Few Arguments<a href="d-f-error-checking-in-function-calls.html#3512-too-few-arguments" class="hash-link" aria-label="Direct link to 3.5.1.2 Too Few Arguments" title="Direct link to 3.5.1.2 Too Few Arguments">​</a></h3>
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<p>It is not permitted to supply too few <span><i>arguments</i></span> to a <span><i>function</i></span>. Too few arguments means fewer <span><i>arguments</i></span> than the number of <span><i>required parameters</i></span> for the <span><i>function</i></span>.</p>
<p>If this <span><i>situation</i></span> occurs in a <span><i>safe call</i></span>, an error of <span><i>type</i></span> <span><b>program-error</b></span> must be signaled; and in an <span><i>unsafe call</i></span> the <span><i>situation</i></span> has undefined consequences.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="3513-too-many-arguments">3.5.1.3 Too Many Arguments<a href="d-f-error-checking-in-function-calls.html#3513-too-many-arguments" class="hash-link" aria-label="Direct link to 3.5.1.3 Too Many Arguments" title="Direct link to 3.5.1.3 Too Many Arguments">​</a></h3>
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<p>It is not permitted to supply too many <span><i>arguments</i></span> to a <span><i>function</i></span>. Too many arguments means more <span><i>arguments</i></span> than the number of <span><i>required parameters</i></span> plus the number of <span><i>optional parameters</i></span>; however, if the <span><i>function</i></span> uses <strong>&amp;rest</strong> or <strong>&amp;key</strong>, it is not possible for it to receive too many arguments.</p>
<p>If this <span><i>situation</i></span> occurs in a <span><i>safe call</i></span>, an error of <span><i>type</i></span> <span><b>program-error</b></span> must be signaled; and in an <span><i>unsafe call</i></span> the <span><i>situation</i></span> has undefined consequences.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="3514-unrecognized-keyword-arguments">3.5.1.4 Unrecognized Keyword Arguments<a href="d-f-error-checking-in-function-calls.html#3514-unrecognized-keyword-arguments" class="hash-link" aria-label="Direct link to 3.5.1.4 Unrecognized Keyword Arguments" title="Direct link to 3.5.1.4 Unrecognized Keyword Arguments">​</a></h3>
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<p>It is not permitted to supply a keyword argument to a <span><i>function</i></span> using a name that is not recognized by that <span><i>function</i></span> unless keyword argument checking is suppressed as described in Section 3.4.1.4.1 (Suppressing Keyword Argument Checking).</p>
<p>If this <span><i>situation</i></span> occurs in a <span><i>safe call</i></span>, an error of <span><i>type</i></span> <span><b>program-error</b></span> must be signaled; and in an <span><i>unsafe call</i></span> the <span><i>situation</i></span> has undefined consequences.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="3515-invalid-keyword-arguments">3.5.1.5 Invalid Keyword Arguments<a href="d-f-error-checking-in-function-calls.html#3515-invalid-keyword-arguments" class="hash-link" aria-label="Direct link to 3.5.1.5 Invalid Keyword Arguments" title="Direct link to 3.5.1.5 Invalid Keyword Arguments">​</a></h3>
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<p>It is not permitted to supply a keyword argument to a <span><i>function</i></span> using a name that is not a <span><i>symbol</i></span>.</p>
<p>If this <span><i>situation</i></span> occurs in a <span><i>safe call</i></span>, an error of <span><i>type</i></span> <span><b>program-error</b></span> must be signaled unless keyword argument checking is suppressed as described in Section 3.4.1.4.1 (Suppressing Keyword Argument Checking); and in an <span><i>unsafe call</i></span> the <span><i>situation</i></span> has undefined consequences.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="3516-odd-number-of-keyword-arguments">3.5.1.6 Odd Number of Keyword Arguments<a href="d-f-error-checking-in-function-calls.html#3516-odd-number-of-keyword-arguments" class="hash-link" aria-label="Direct link to 3.5.1.6 Odd Number of Keyword Arguments" title="Direct link to 3.5.1.6 Odd Number of Keyword Arguments">​</a></h3>
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<p>An odd number of <span><i>arguments</i></span> must not be supplied for the <span><i>keyword parameters</i></span>.</p>
<p>If this <span><i>situation</i></span> occurs in a <span><i>safe call</i></span>, an error of <span><i>type</i></span> <span><b>program-error</b></span> must be signaled unless keyword argument checking is suppressed as described in Section 3.4.1.4.1 (Suppressing Keyword Argument Checking); and in an <span><i>unsafe call</i></span> the <span><i>situation</i></span> has undefined consequences.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="3517-destructuring-mismatch">3.5.1.7 Destructuring Mismatch<a href="d-f-error-checking-in-function-calls.html#3517-destructuring-mismatch" class="hash-link" aria-label="Direct link to 3.5.1.7 Destructuring Mismatch" title="Direct link to 3.5.1.7 Destructuring Mismatch">​</a></h3>
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<p>When matching a <span><i>destructuring lambda list</i></span> against a <span><i>form</i></span>, the pattern and the <span><i>form</i></span> must have compatible <span><i>tree structure</i></span>, as described in Section 3.4.4 (Macro Lambda Lists).</p>
<p>Otherwise, in a <span><i>safe call</i></span>, an error of <span><i>type</i></span> <span><b>program-error</b></span> must be signaled; and in an <span><i>unsafe call</i></span> the <span><i>situation</i></span> has undefined consequences.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="3518-errors-when-calling-a-next-method">3.5.1.8 Errors When Calling a Next Method<a href="d-f-error-checking-in-function-calls.html#3518-errors-when-calling-a-next-method" class="hash-link" aria-label="Direct link to 3.5.1.8 Errors When Calling a Next Method" title="Direct link to 3.5.1.8 Errors When Calling a Next Method">​</a></h3>
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<p>If <span><b>call-next-method</b></span> is called with <span><i>arguments</i></span>, the ordered set of <span><i>applicable methods</i></span> for the changed set of <span><i>arguments</i></span> for <span><b>call-next-method</b></span> must be the same as the ordered set of <span><i>applicable methods</i></span> for the original <span><i>arguments</i></span> to the <span><i>generic function</i></span>, or else an error should be signaled.</p>
<p>The comparison between the set of methods applicable to the new arguments and the set applicable to the original arguments is insensitive to order differences among methods with the same specializers.</p>
<p>If <span><b>call-next-method</b></span> is called with <span><i>arguments</i></span> that specify a different ordered set of <span><i>applicable</i></span> methods and there is no <span><i>next method</i></span> available, the test for different methods and the associated error signaling (when present) takes precedence over calling <span><b>no-next-method</b></span>.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/lisp-docs/cl-language-reference/tree/main/docs/chap-3/d-f-error-checking-in-function-calls.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> by <b>daninus14</b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="d-e-lambda-lists.html"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">3.4 Lambda Lists</div></a><a class="pagination-nav__link pagination-nav__link--next" href="d-g-traversal-rules-and-side-effects.html"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">3.6 Traversal Rules and Side Effects</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="d-f-error-checking-in-function-calls.html#351-argument-mismatch-detection" class="table-of-contents__link toc-highlight">3.5.1 Argument Mismatch Detection</a><ul><li><a href="d-f-error-checking-in-function-calls.html#3511-safe-and-unsafe-calls" class="table-of-contents__link toc-highlight">3.5.1.1 Safe and Unsafe Calls</a><ul><li><a href="d-f-error-checking-in-function-calls.html#35111-error-detection-time-in-safe-calls" class="table-of-contents__link toc-highlight">3.5.1.1.1 Error Detection Time in Safe Calls</a></li></ul></li><li><a href="d-f-error-checking-in-function-calls.html#3512-too-few-arguments" class="table-of-contents__link toc-highlight">3.5.1.2 Too Few Arguments</a></li><li><a href="d-f-error-checking-in-function-calls.html#3513-too-many-arguments" class="table-of-contents__link toc-highlight">3.5.1.3 Too Many Arguments</a></li><li><a href="d-f-error-checking-in-function-calls.html#3514-unrecognized-keyword-arguments" class="table-of-contents__link toc-highlight">3.5.1.4 Unrecognized Keyword Arguments</a></li><li><a href="d-f-error-checking-in-function-calls.html#3515-invalid-keyword-arguments" class="table-of-contents__link toc-highlight">3.5.1.5 Invalid Keyword Arguments</a></li><li><a href="d-f-error-checking-in-function-calls.html#3516-odd-number-of-keyword-arguments" class="table-of-contents__link toc-highlight">3.5.1.6 Odd Number of Keyword Arguments</a></li><li><a href="d-f-error-checking-in-function-calls.html#3517-destructuring-mismatch" class="table-of-contents__link toc-highlight">3.5.1.7 Destructuring Mismatch</a></li><li><a href="d-f-error-checking-in-function-calls.html#3518-errors-when-calling-a-next-method" class="table-of-contents__link toc-highlight">3.5.1.8 Errors When Calling a Next Method</a></li></ul></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Docs</div><ul class="footer__items clean-list"><li class="footer__item"><a href="../../docs/tutorial.html" target="_blank" rel="noopener noreferrer" class="footer__link-item">Common Lisp Tutorial</a></li><li class="footer__item"><a href="../index.html" target="_blank" rel="
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