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class="shingle-content"> <div id="pac-nav-sidebar-frame" class="desktop loading"> <nav id="pac-nav-sidebar"> <h1> <a href="https://resources.wolframcloud.com/PacletRepository/resources/Wolfram/ErrorTools/"> <svg class="home-icon" viewBox="0 0 32 28"> <path d="M5 28V17L16 6l11 11v11h-8v-7h-6v7H5ZM22 6h1V3h4v8l5 5-2 2L16 4 2 18l-2-2L16 0l6 6Z" /> </svg> <span class="text"> ErrorTools </span> </a> </h1> <section> <h2>Guides</h2> <div class="links"> <ul> <li><a href="https://resources.wolframcloud.com/PacletRepository/resources/Wolfram/ErrorTools/guide/ErrorTools.html">ErrorTools</a></li> </ul> </div> </section> <section> <h2>Tech Notes</h2> <div class="links"> <ul> <li><a href="https://resources.wolframcloud.com/PacletRepository/resources/Wolfram/ErrorTools/tutorial/ErrorHandlingWithErrorTools.html">Error Handling with ErrorTools</a></li> </ul> </div> </section> <section> <h2>Symbols</h2> <div class="links"> <ul> <li><a href="https://resources.wolframcloud.com/PacletRepository/resources/Wolfram/ErrorTools/ref/Raise.html">Raise</a></li> </ul> </div> </section> </nav> </div> <div class="wrap"> <div class="page-title full"> <div class="zc_c2c" data-clipboard-text="PacletObject[ResourceObject["Wolfram/ErrorTools"]]"> <h1> <span class="PublisherID"> Wolfram/ </span> Error<wbr/>Tools </h1> </div>   </div> <p class="lead">Prototype implementation of next-generation error handling for Wolfram Language, from the Error Handling Working Group (EHWG)</p> <p class="originator"> Contributed by: Error Handling Working Group </p> <div id="rate-as-good-frame" data-get-count-api="https://www.wolframcloud.com/obj/resourcesystem/api/1.0/CheckRecommendation?UUID=b64c5bf2-c56b-4855-9ffd-9e709646e40f" data-update-count-api="https://www.wolframcloud.com/obj/resourcesystem/api/1.0/Recommend?UUID=b64c5bf2-c56b-4855-9ffd-9e709646e40f" ></div>  <div class="top-of-shingle-copy"> <div class="more-description"> <div class='more-description-notebook'><p class='example-text' id='441612482'>This paclet contains experimental prototypes of new functions and frameworks for robustly and ergonomically reporting and handling of error conditions within Wolfram Language code.</p><p class='example-text' id='1581206395'>This paclet is a product of the Error Handling Working Group.</p></div> </div> <div class="hero-image-frame"> <img class="hero-image" src="https://www.wolframcloud.com/obj/resourcesystem/published/PacletRepository/resources/Wolfram/ErrorTools/hero-image.png" /> </div> </div> <div class="install-code"> <h2 id="InstallCode" class="visuallyhidden"> Installation Instructions </h2> <p> To install this paclet in your Wolfram Language environment, evaluate this code:<br /> <span class="zc_c2c" data-clipboard-text="PacletInstall["Wolfram/ErrorTools"]"> <kbd>PacletInstall["Wolfram/ErrorTools"]</kbd> </span> </p> </div> <div> <div class='documentation-notebook'><div class='minimized-notebook-view'><div class='section cell-group'><h2>Details</h2><div class='notes' id='658537531'>The functionality in this paclet is a collection of prototype implementations intended for experimentation and rapid iteration. 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style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div style="padding-top:1px;padding-bottom:1px"><div class="native-layout native-layout-simple" style="margin-top:-2px;margin-bottom:-2px;text-align:left;line-height:20.776px"><span class="_ccc1">The new error handling functionality in this paclet is centered around quality of life improvements to </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:62.779296875px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:1px;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:41px;height:11px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:40.558px;height:11px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:40.558px;height:11px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:40.558px;height:11px;top:0;left:0"><span class="pa ch _ccc3" style="top:-2px;left:0px">F</span><span class="pa ch _ccc3" style="top:-2px;left:6.9px">a</span><span class="pa ch _ccc3" style="top:-2px;left:14.1px">i</span><span class="pa ch _ccc3" style="top:-2px;left:17.5px">l</span><span class="pa ch _ccc3" style="top:-2px;left:21.1px">u</span><span class="pa ch _ccc3" style="top:-2px;left:28.7px">r</span><span class="pa ch _ccc3" style="top:-2px;left:33.6px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc5" style="height:11px;top:0px;left:41px">[</span><span class="pa char _ccc7" style="height:4.666666666666667px;top:6.3px;left:44.9px">…</span><span class="pa char _ccc5" style="height:11px;top:0px;left:58.9px">]</span></div></div></div><span class="_ccc1"> and the addition of new functions that construct, throw, and catch </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:62.779296875px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:1px;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:41px;height:11px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:40.558px;height:11px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:40.558px;height:11px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:40.558px;height:11px;top:0;left:0"><span class="pa ch _ccc3" style="top:-2px;left:0px">F</span><span class="pa ch _ccc3" style="top:-2px;left:6.9px">a</span><span class="pa ch _ccc3" style="top:-2px;left:14.1px">i</span><span class="pa ch _ccc3" style="top:-2px;left:17.5px">l</span><span class="pa ch _ccc3" style="top:-2px;left:21.1px">u</span><span class="pa ch _ccc3" style="top:-2px;left:28.7px">r</span><span class="pa ch _ccc3" style="top:-2px;left:33.6px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc5" style="height:11px;top:0px;left:41px">[</span><span class="pa char _ccc7" style="height:4.666666666666667px;top:6.3px;left:44.9px">…</span><span class="pa char _ccc5" style="height:11px;top:0px;left:58.9px">]</span></div></div></div><span class="_ccc1"> objects.</span></div></div></div></div></div></div><div class="cell-native" id="cell-b5528835-ca37-4bf4-a919-a8c3006e8440" style="width:100%;min-width:min-content;padding-top:10px;padding-bottom:5px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="27" data-cache-uuid="b5528835-ca37-4bf4-a919-a8c3006e8440" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:22.369px"><span class="_ccc8">Failure Error Tags</span></div></div></div></div></div><div class="cell-native" id="cell-1fe6d1fd-e239-4026-b8f4-e576a07b76f5" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="1fe6d1fd-e239-4026-b8f4-e576a07b76f5" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-4px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:108px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:107.47499999999998px;height:14px"><span class="pa ch _ccc11" style="top:-2.8px;left:0px">C</span><span class="pa ch _ccc11" style="top:-2.8px;left:8.6px">r</span><span class="pa ch _ccc11" style="top:-2.8px;left:14.2px">e</span><span class="pa ch _ccc11" style="top:-2.8px;left:21.8px">a</span><span class="pa ch _ccc11" style="top:-2.8px;left:29.7px">t</span><span class="pa ch _ccc11" style="top:-2.8px;left:35.1px">e</span><span class="pa ch _ccc11" style="top:-2.8px;left:42.7px">E</span><span class="pa ch _ccc11" style="top:-2.8px;left:50.8px">r</span><span class="pa ch _ccc11" style="top:-2.8px;left:56.4px">r</span><span class="pa ch _ccc11" style="top:-2.8px;left:62px">o</span><span class="pa ch _ccc11" style="top:-2.8px;left:70.2px">r</span><span class="pa ch _ccc11" style="top:-2.8px;left:75.8px">T</span><span class="pa ch _ccc11" style="top:-2.8px;left:84px">y</span><span class="pa ch _ccc11" style="top:-2.8px;left:91.4px">p</span><span class="pa ch _ccc11" style="top:-2.8px;left:99.9px">e</span></div></div></div></div></div></div><span class="_ccc13"> — register a new error tag usable with </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:88px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:87.735px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">C</span><span class="pa ch _ccc11" style="top:-1.8px;left:8.6px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:14.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:21.8px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:29.7px">t</span><span class="pa ch _ccc11" style="top:-1.8px;left:35.1px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:42.7px">F</span><span class="pa ch _ccc11" style="top:-1.8px;left:50.4px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:58.2px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:62.1px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:66.2px">u</span><span class="pa ch _ccc11" style="top:-1.8px;left:74.5px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:80.1px">e</span></div></div></div></div></div></div><span class="_ccc13">, </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:35px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:35px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:35px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://resources.wolframcloud.com/PacletRepository/resources/Wolfram/ErrorTools/ref/Raise.html" style="width:35px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:35px;height:12px;top:0;left:0"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:34.83px;height:12px"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">R</span><span class="pa ch _ccc15" style="top:-1.8px;left:9px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:16.8px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:20.8px">s</span><span class="pa ch _ccc15" style="top:-1.8px;left:27.2px">e</span></div></div></div></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13">, and </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:47px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46.31999999999999px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">H</span><span class="pa ch _ccc11" style="top:-1.8px;left:9.9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:17.8px">n</span><span class="pa ch _ccc11" style="top:-1.8px;left:26.2px">d</span><span class="pa ch _ccc11" style="top:-1.8px;left:34.6px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:38.7px">e</span></div></div></div></div></div></div></div></div></div></div></div><div class="cell-native" id="cell-f5b8b07e-8a17-40e0-aa34-eb66ac575497" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="f5b8b07e-8a17-40e0-aa34-eb66ac575497" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:88px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:87.735px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">C</span><span class="pa ch _ccc11" style="top:-1.8px;left:8.6px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:14.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:21.8px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:29.7px">t</span><span class="pa ch _ccc11" style="top:-1.8px;left:35.1px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:42.7px">F</span><span class="pa ch _ccc11" style="top:-1.8px;left:50.4px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:58.2px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:62.1px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:66.2px">u</span><span class="pa ch _ccc11" style="top:-1.8px;left:74.5px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:80.1px">e</span></div></div></div></div></div></div><span class="_ccc13"> — construct a new </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:67.3349609375px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:44px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:43.455px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:43.455px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:43.455px;height:12px;top:0;left:0"><span class="pa ch _ccc18" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc18" style="top:-1.8px;left:7.4px">a</span><span class="pa ch _ccc18" style="top:-1.8px;left:15.1px">i</span><span class="pa ch _ccc18" style="top:-1.8px;left:18.8px">l</span><span class="pa ch _ccc18" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc18" style="top:-1.8px;left:30.8px">r</span><span class="pa ch _ccc18" style="top:-1.8px;left:36px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc17" style="height:11px;top:0px;left:44px">[</span><span class="pa char _ccc21" style="height:5px;top:6px;left:48.2px">…</span><span class="pa char _ccc17" style="height:11px;top:0px;left:63.2px">]</span></div></div></div><span class="_ccc13"> with the specified error tag and formatted message</span></div></div></div></div></div><div class="cell-native" id="cell-953773a0-d0a8-4769-a53c-b0a1da98da80" style="width:100%;min-width:min-content;padding-top:10px;padding-bottom:5px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="27" data-cache-uuid="953773a0-d0a8-4769-a53c-b0a1da98da80" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:22.369px"><span class="_ccc8">Raising and Handling Failure Exceptions</span></div></div></div></div></div><div class="cell-native" id="cell-a697923c-2826-4105-80fa-091fb113be28" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="a697923c-2826-4105-80fa-091fb113be28" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div style="padding-top:1px;padding-bottom:1px"><div class="native-layout native-layout-simple" style="margin-top:-2px;margin-bottom:-2px;text-align:left;line-height:21.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:35px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:35px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:35px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://resources.wolframcloud.com/PacletRepository/resources/Wolfram/ErrorTools/ref/Raise.html" style="width:35px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:35px;height:12px;top:0;left:0"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:34.83px;height:12px"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">R</span><span class="pa ch _ccc15" style="top:-1.8px;left:9px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:16.8px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:20.8px">s</span><span class="pa ch _ccc15" style="top:-1.8px;left:27.2px">e</span></div></div></div></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13"> and </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:47px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46.31999999999999px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">H</span><span class="pa ch _ccc11" style="top:-1.8px;left:9.9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:17.8px">n</span><span class="pa ch _ccc11" style="top:-1.8px;left:26.2px">d</span><span class="pa ch _ccc11" style="top:-1.8px;left:34.6px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:38.7px">e</span></div></div></div></div></div></div><span class="_ccc13"> are analogous to </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:42px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:42px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:41.64px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Throw.html" style="width:41.64px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:41.64px;height:12px;top:0;left:0"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">T</span><span class="pa ch _ccc15" style="top:-1.8px;left:8.2px">h</span><span class="pa ch _ccc15" style="top:-1.8px;left:16.6px">r</span><span class="pa ch _ccc15" style="top:-1.8px;left:22.2px">o</span><span class="pa ch _ccc15" style="top:-1.8px;left:30.4px">w</span></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13"> and </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:38px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:38px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:37.199999999999996px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Catch.html" style="width:37.199999999999996px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:37.199999999999996px;height:12px;top:0;left:0"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">C</span><span class="pa ch _ccc15" style="top:-1.8px;left:8.6px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:16.5px">t</span><span class="pa ch _ccc15" style="top:-1.8px;left:21.9px">c</span><span class="pa ch _ccc15" style="top:-1.8px;left:28.8px">h</span></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13">, but they assume that the thrown "payload" is always a </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:67.3349609375px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:44px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:43.455px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:43.455px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:43.455px;height:12px;top:0;left:0"><span class="pa ch _ccc18" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc18" style="top:-1.8px;left:7.4px">a</span><span class="pa ch _ccc18" style="top:-1.8px;left:15.1px">i</span><span class="pa ch _ccc18" style="top:-1.8px;left:18.8px">l</span><span class="pa ch _ccc18" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc18" style="top:-1.8px;left:30.8px">r</span><span class="pa ch _ccc18" style="top:-1.8px;left:36px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc17" style="height:11px;top:0px;left:44px">[</span><span class="pa char _ccc21" style="height:5px;top:6px;left:48.2px">…</span><span class="pa char _ccc17" style="height:11px;top:0px;left:63.2px">]</span></div></div></div><span class="_ccc13"> object. </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:47px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46.31999999999999px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">H</span><span class="pa ch _ccc11" style="top:-1.8px;left:9.9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:17.8px">n</span><span class="pa ch _ccc11" style="top:-1.8px;left:26.2px">d</span><span class="pa ch _ccc11" style="top:-1.8px;left:34.6px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:38.7px">e</span></div></div></div></div></div></div><span class="_ccc13"> supports conditional catching of throw </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:45.059999999999995px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:45.059999999999995px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:45.059999999999995px;height:12px;top:0;left:0"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc15" style="top:-1.8px;left:7.6px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:15.5px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:19.4px">l</span><span class="pa ch _ccc15" style="top:-1.8px;left:23.5px">u</span><span class="pa ch _ccc15" style="top:-1.8px;left:31.8px">r</span><span class="pa ch _ccc15" style="top:-1.8px;left:37.5px">e</span></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13">'s by pattern matching.</span></div></div></div></div></div></div><div class="cell-native" id="cell-8cd60373-86ef-48c7-9056-d6e702339895" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="8cd60373-86ef-48c7-9056-d6e702339895" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:35px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:35px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:35px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://resources.wolframcloud.com/PacletRepository/resources/Wolfram/ErrorTools/ref/Raise.html" style="width:35px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:35px;height:12px;top:0;left:0"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:34.83px;height:12px"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">R</span><span class="pa ch _ccc15" style="top:-1.8px;left:9px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:16.8px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:20.8px">s</span><span class="pa ch _ccc15" style="top:-1.8px;left:27.2px">e</span></div></div></div></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13"> — construct and throw a </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:67.3349609375px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:44px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:43.455px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:43.455px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:43.455px;height:12px;top:0;left:0"><span class="pa ch _ccc18" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc18" style="top:-1.8px;left:7.4px">a</span><span class="pa ch _ccc18" style="top:-1.8px;left:15.1px">i</span><span class="pa ch _ccc18" style="top:-1.8px;left:18.8px">l</span><span class="pa ch _ccc18" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc18" style="top:-1.8px;left:30.8px">r</span><span class="pa ch _ccc18" style="top:-1.8px;left:36px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc17" style="height:11px;top:0px;left:44px">[</span><span class="pa char _ccc21" style="height:5px;top:6px;left:48.2px">…</span><span class="pa char _ccc17" style="height:11px;top:0px;left:63.2px">]</span></div></div></div><span class="_ccc13"> with the specified error tag and formatted message</span></div></div></div></div></div><div class="cell-native" id="cell-540dd102-ddcb-4e9a-80ee-ed0a71a45b2d" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="540dd102-ddcb-4e9a-80ee-ed0a71a45b2d" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:47px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46.31999999999999px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">H</span><span class="pa ch _ccc11" style="top:-1.8px;left:9.9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:17.8px">n</span><span class="pa ch _ccc11" style="top:-1.8px;left:26.2px">d</span><span class="pa ch _ccc11" style="top:-1.8px;left:34.6px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:38.7px">e</span></div></div></div></div></div></div><span class="_ccc13"> — catch raised </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:67.3349609375px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:44px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:43.455px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:43.455px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:43.455px;height:12px;top:0;left:0"><span class="pa ch _ccc18" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc18" style="top:-1.8px;left:7.4px">a</span><span class="pa ch _ccc18" style="top:-1.8px;left:15.1px">i</span><span class="pa ch _ccc18" style="top:-1.8px;left:18.8px">l</span><span class="pa ch _ccc18" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc18" style="top:-1.8px;left:30.8px">r</span><span class="pa ch _ccc18" style="top:-1.8px;left:36px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc17" style="height:11px;top:0px;left:44px">[</span><span class="pa char _ccc21" style="height:5px;top:6px;left:48.2px">…</span><span class="pa char _ccc17" style="height:11px;top:0px;left:63.2px">]</span></div></div></div><span class="_ccc13">'s that match the specified error tag</span></div></div></div></div></div><div class="cell-native" id="cell-5d382fb0-d6e8-4167-90c1-27116d09bd77" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="5d382fb0-d6e8-4167-90c1-27116d09bd77" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:95px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:94.18500000000002px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc11" style="top:-1.8px;left:7.6px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:15.5px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:19.4px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:23.5px">u</span><span class="pa ch _ccc11" style="top:-1.8px;left:31.8px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:37.4px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:45px">P</span><span class="pa ch _ccc11" style="top:-1.8px;left:53.9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:61.8px">t</span><span class="pa ch _ccc11" style="top:-1.8px;left:67.2px">t</span><span class="pa ch _ccc11" style="top:-1.8px;left:72.6px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:80.2px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:85.8px">n</span></div></div></div></div></div></div><span class="_ccc13"> — pattern that matches any </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:45.059999999999995px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:45.059999999999995px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:45.059999999999995px;height:12px;top:0;left:0"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc15" style="top:-1.8px;left:7.6px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:15.5px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:19.4px">l</span><span class="pa ch _ccc15" style="top:-1.8px;left:23.5px">u</span><span class="pa ch _ccc15" style="top:-1.8px;left:31.8px">r</span><span class="pa ch _ccc15" style="top:-1.8px;left:37.5px">e</span></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13"> containing the specified tag</span></div></div></div></div></div><div class="cell-native" id="cell-9c47bfd7-0069-4c30-b70c-10da0e94cc97" style="width:100%;min-width:min-content;padding-top:10px;padding-bottom:5px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="27" data-cache-uuid="9c47bfd7-0069-4c30-b70c-10da0e94cc97" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:22.369px"><span class="_ccc8">Logic Error Checking Utilities</span></div></div></div></div></div><div class="cell-native" id="cell-f54dff79-7c6b-4e53-8564-4a1123a40e1f" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="f54dff79-7c6b-4e53-8564-4a1123a40e1f" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div style="padding-top:1px;padding-bottom:1px"><div class="native-layout native-layout-simple" style="margin-top:-2px;margin-bottom:-2px;text-align:left;line-height:21.855px"><span class="_ccc13">Utilities for failing fast and informatively when a program state was reached that the programmer didn't intend or anticipate. These utilities should not be used to raise errors that are expected by the programmer.</span></div></div></div></div></div></div><div class="cell-native" id="cell-b15eb608-a195-49b5-8fb1-a71e57f3a90f" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="b15eb608-a195-49b5-8fb1-a71e57f3a90f" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:75px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:74.745px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">R</span><span class="pa ch _ccc11" style="top:-1.8px;left:9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:16.8px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:20.8px">s</span><span class="pa ch _ccc11" style="top:-1.8px;left:27.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:34.8px">A</span><span class="pa ch _ccc11" style="top:-1.8px;left:43.2px">s</span><span class="pa ch _ccc11" style="top:-1.8px;left:49.7px">s</span><span class="pa ch _ccc11" style="top:-1.8px;left:56.1px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:63.7px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:69.3px">t</span></div></div></div></div></div></div><span class="_ccc13"> — raise a </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:185.7049609375px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:44px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:43.455px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:43.455px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:43.455px;height:12px;top:0;left:0"><span class="pa ch _ccc18" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc18" style="top:-1.8px;left:7.4px">a</span><span class="pa ch _ccc18" style="top:-1.8px;left:15.1px">i</span><span class="pa ch _ccc18" style="top:-1.8px;left:18.8px">l</span><span class="pa ch _ccc18" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc18" style="top:-1.8px;left:30.8px">r</span><span class="pa ch _ccc18" style="top:-1.8px;left:36px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc17" style="height:11px;top:0px;left:44px">[</span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:48.16748046875px" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:108.465px;height:12px"><span class="pa ch _ccc13" style="top:-1.8px;left:0px">A</span><span class="pa ch _ccc13" style="top:-1.8px;left:8.2px">s</span><span class="pa ch _ccc13" style="top:-1.8px;left:14.4px">s</span><span class="pa ch _ccc13" style="top:-1.8px;left:20.7px">e</span><span class="pa ch _ccc13" style="top:-1.8px;left:28.2px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:33.4px">t</span><span class="pa ch _ccc13" style="top:-1.8px;left:38.4px">F</span><span class="pa ch _ccc13" style="top:-1.8px;left:45.9px">a</span><span class="pa ch _ccc13" style="top:-1.8px;left:53.5px">i</span><span class="pa ch _ccc13" style="top:-1.8px;left:57.2px">l</span><span class="pa ch _ccc13" style="top:-1.8px;left:61.1px">e</span><span class="pa ch _ccc13" style="top:-1.8px;left:68.5px">d</span><span class="pa ch _ccc13" style="top:-1.8px;left:76.8px">E</span><span class="pa ch _ccc13" style="top:-1.8px;left:84.7px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:89.9px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:95.1px">o</span><span class="pa ch _ccc13" style="top:-1.8px;left:103.3px">r</span></div></div></div><span class="pa ch _ccc13" style="top:-1.8px;left:157.2px">,</span><span style="display:inline-block;width:2px;top:11px;left:164.5px" class="pa"></span><span class="pa char _ccc21" style="height:5px;top:6px;left:166.5px">…</span><span class="pa char _ccc17" style="height:11px;top:0px;left:181.5px">]</span></div></div></div><span class="_ccc13"> if the specified condition is not true, with an optional custom error message</span></div></div></div></div></div><div class="cell-native" id="cell-cfae8551-2d6b-41db-974d-71d5b904a88e" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="cfae8551-2d6b-41db-974d-71d5b904a88e" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div style="padding-top:1px;padding-bottom:1px"><div class="native-layout native-layout-simple" style="margin-top:-2px;margin-bottom:-2px;text-align:left;line-height:21.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:104px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:103.69499999999998px;height:14px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">C</span><span class="pa ch _ccc11" style="top:-1.8px;left:8.6px">o</span><span class="pa ch _ccc11" style="top:-1.8px;left:16.9px">n</span><span class="pa ch _ccc11" style="top:-1.8px;left:25.3px">f</span><span class="pa ch _ccc11" style="top:-1.8px;left:30px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:34px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:39.6px">m</span><span class="pa ch _ccc11" style="top:-1.8px;left:52.2px">R</span><span class="pa ch _ccc11" style="top:-1.8px;left:61.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:68.8px">p</span><span class="pa ch _ccc11" style="top:-1.8px;left:77.2px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:81.3px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:89.2px">c</span><span class="pa ch _ccc11" style="top:-1.8px;left:96.1px">e</span></div></div></div></div></div></div><span class="_ccc13"> — apply a rule or list of rules in an attempt to transform the specified expr, raising a </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-4px;height:15px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:209.7049609375px;height:15px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:44px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:43.455px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:43.455px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:43.455px;height:12px;top:0;left:0"><span class="pa ch _ccc18" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc18" style="top:-1.8px;left:7.4px">a</span><span class="pa ch _ccc18" style="top:-1.8px;left:15.1px">i</span><span class="pa ch _ccc18" style="top:-1.8px;left:18.8px">l</span><span class="pa ch _ccc18" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc18" style="top:-1.8px;left:30.8px">r</span><span class="pa ch _ccc18" style="top:-1.8px;left:36px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc22" style="height:11px;top:0px;left:44px">[</span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:48.16748046875px" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:132.525px;height:15px"><span class="pa ch _ccc13" style="top:-1.8px;left:0px">C</span><span class="pa ch _ccc13" style="top:-1.8px;left:8.6px">o</span><span class="pa ch _ccc13" style="top:-1.8px;left:16.7px">n</span><span class="pa ch _ccc13" style="top:-1.8px;left:24.9px">f</span><span class="pa ch _ccc13" style="top:-1.8px;left:29.3px">i</span><span class="pa ch _ccc13" style="top:-1.8px;left:33px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:38.2px">m</span><span class="pa ch _ccc13" style="top:-1.8px;left:50.6px">R</span><span class="pa ch _ccc13" style="top:-1.8px;left:59.3px">e</span><span class="pa ch _ccc13" style="top:-1.8px;left:66.8px">p</span><span class="pa ch _ccc13" style="top:-1.8px;left:75.1px">l</span><span class="pa ch _ccc13" style="top:-1.8px;left:78.9px">a</span><span class="pa ch _ccc13" style="top:-1.8px;left:86.6px">c</span><span class="pa ch _ccc13" style="top:-1.8px;left:93.4px">e</span><span class="pa ch _ccc13" style="top:-1.8px;left:100.9px">E</span><span class="pa ch _ccc13" style="top:-1.8px;left:108.8px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:114px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:119.2px">o</span><span class="pa ch _ccc13" style="top:-1.8px;left:127.3px">r</span></div></div></div><span class="pa ch _ccc13" style="top:-1.8px;left:181.2px">,</span><span style="display:inline-block;width:2px;top:11px;left:188.5px" class="pa"></span><span class="pa char _ccc21" style="height:5px;top:6px;left:190.5px">…</span><span class="pa char _ccc22" style="height:11px;top:0px;left:205.5px">]</span></div></div></div><span class="_ccc13"> if no rule matches</span></div></div></div></div></div></div><div class="cell-native" id="cell-636351e5-cf9d-42c7-8329-5800c05b32bb" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="636351e5-cf9d-42c7-8329-5800c05b32bb" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div style="padding-top:1px;padding-bottom:1px"><div class="native-layout native-layout-simple" style="margin-top:-2px;margin-bottom:-2px;text-align:left;line-height:21.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-4px;height:15px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:131px;height:15px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:130.035px;height:15px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">S</span><span class="pa ch _ccc11" style="top:-1.8px;left:8.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:15.8px">t</span><span class="pa ch _ccc11" style="top:-1.8px;left:21.2px">F</span><span class="pa ch _ccc11" style="top:-1.8px;left:28.8px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:36.7px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:40.8px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:44.8px">t</span><span class="pa ch _ccc11" style="top:-1.8px;left:50.2px">h</span><span class="pa ch _ccc11" style="top:-1.8px;left:58.6px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:64.2px">o</span><span class="pa ch _ccc11" style="top:-1.8px;left:72.4px">u</span><span class="pa ch _ccc11" style="top:-1.8px;left:80.8px">g</span><span class="pa ch _ccc11" style="top:-1.8px;left:88.6px">h</span><span class="pa ch _ccc11" style="top:-1.8px;left:96.9px">E</span><span class="pa ch _ccc11" style="top:-1.8px;left:105px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:110.6px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:116.2px">o</span><span class="pa ch _ccc11" style="top:-1.8px;left:124.4px">r</span></div></div></div></div></div></div><span class="_ccc13"> — set a "fallthrough" down value on the specified symbol that raises a </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-4px;height:15px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:252.7049609375px;height:15px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:44px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:43.455px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:43.455px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:43.455px;height:12px;top:0;left:0"><span class="pa ch _ccc18" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc18" style="top:-1.8px;left:7.4px">a</span><span class="pa ch _ccc18" style="top:-1.8px;left:15.1px">i</span><span class="pa ch _ccc18" style="top:-1.8px;left:18.8px">l</span><span class="pa ch _ccc18" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc18" style="top:-1.8px;left:30.8px">r</span><span class="pa ch _ccc18" style="top:-1.8px;left:36px">e</span></div></a></div></div></div></div></div></div><span class="pa char _ccc22" style="height:11px;top:0px;left:44px">[</span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:48.16748046875px" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:175.99500000000003px;height:15px"><span class="pa ch _ccc13" style="top:-1.8px;left:0px">D</span><span class="pa ch _ccc13" style="top:-1.8px;left:9.2px">o</span><span class="pa ch _ccc13" style="top:-1.8px;left:17.4px">w</span><span class="pa ch _ccc13" style="top:-1.8px;left:28.1px">n</span><span class="pa ch _ccc13" style="top:-1.8px;left:36.3px">V</span><span class="pa ch _ccc13" style="top:-1.8px;left:44.1px">a</span><span class="pa ch _ccc13" style="top:-1.8px;left:51.7px">l</span><span class="pa ch _ccc13" style="top:-1.8px;left:55.6px">u</span><span class="pa ch _ccc13" style="top:-1.8px;left:63.7px">e</span><span class="pa ch _ccc13" style="top:-1.8px;left:71.2px">F</span><span class="pa ch _ccc13" style="top:-1.8px;left:78.6px">a</span><span class="pa ch _ccc13" style="top:-1.8px;left:86.3px">l</span><span class="pa ch _ccc13" style="top:-1.8px;left:90.1px">l</span><span class="pa ch _ccc13" style="top:-1.8px;left:93.9px">t</span><span class="pa ch _ccc13" style="top:-1.8px;left:99px">h</span><span class="pa ch _ccc13" style="top:-1.8px;left:107.1px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:112.3px">o</span><span class="pa ch _ccc13" style="top:-1.8px;left:120.5px">u</span><span class="pa ch _ccc13" style="top:-1.8px;left:128.6px">g</span><span class="pa ch _ccc13" style="top:-1.8px;left:136.2px">h</span><span class="pa ch _ccc13" style="top:-1.8px;left:144.3px">E</span><span class="pa ch _ccc13" style="top:-1.8px;left:152.3px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:157.5px">r</span><span class="pa ch _ccc13" style="top:-1.8px;left:162.7px">o</span><span class="pa ch _ccc13" style="top:-1.8px;left:170.8px">r</span></div></div></div><span class="pa ch _ccc13" style="top:-1.8px;left:224.2px">,</span><span style="display:inline-block;width:2px;top:11px;left:231.5px" class="pa"></span><span class="pa char _ccc21" style="height:5px;top:6px;left:233.5px">…</span><span class="pa char _ccc22" style="height:11px;top:0px;left:248.5px">]</span></div></div></div><span class="_ccc13"> if no other down values match</span></div></div></div></div></div></div><div class="cell-native" id="cell-90a49f3f-6779-48a0-888e-3251572bf356" style="width:100%;min-width:min-content;padding-top:10px;padding-bottom:5px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="27" data-cache-uuid="90a49f3f-6779-48a0-888e-3251572bf356" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:22.369px"><span class="_ccc8">Error Propagation & Composition</span></div></div></div></div></div><div class="cell-native" id="cell-1cc91000-19a2-41a0-99a8-39c8846f24c3" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="1cc91000-19a2-41a0-99a8-39c8846f24c3" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:88px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:87.02999999999999px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">R</span><span class="pa ch _ccc11" style="top:-1.8px;left:9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:16.8px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:20.8px">s</span><span class="pa ch _ccc11" style="top:-1.8px;left:27.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:34.8px">C</span><span class="pa ch _ccc11" style="top:-1.8px;left:43.5px">o</span><span class="pa ch _ccc11" style="top:-1.8px;left:51.7px">n</span><span class="pa ch _ccc11" style="top:-1.8px;left:60.1px">f</span><span class="pa ch _ccc11" style="top:-1.8px;left:64.9px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:68.8px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:74.4px">m</span></div></div></div></div></div></div><span class="_ccc13"> — if the argument expression is a Failure, raise it, otherwise return it</span></div></div></div></div></div><div class="cell-native" id="cell-02a1dc3d-4147-4cb1-94fd-27326b72a021" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="02a1dc3d-4147-4cb1-94fd-27326b72a021" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div style="padding-top:1px;padding-bottom:1px"><div class="native-layout native-layout-simple" style="margin-top:-2px;margin-bottom:-2px;text-align:left;line-height:21.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:79px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:78.92999999999999px;height:14px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">W</span><span class="pa ch _ccc11" style="top:-1.8px;left:12px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:17.6px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:25.4px">p</span><span class="pa ch _ccc11" style="top:-1.8px;left:33.9px">F</span><span class="pa ch _ccc11" style="top:-1.8px;left:41.5px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:49.4px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:53.3px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:57.4px">u</span><span class="pa ch _ccc11" style="top:-1.8px;left:65.7px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:71.3px">e</span></div></div></div></div></div></div><span class="_ccc13"> — wraps an existing </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:45.059999999999995px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:45.059999999999995px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:45.059999999999995px;height:12px;top:0;left:0"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc15" style="top:-1.8px;left:7.6px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:15.5px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:19.4px">l</span><span class="pa ch _ccc15" style="top:-1.8px;left:23.5px">u</span><span class="pa ch _ccc15" style="top:-1.8px;left:31.8px">r</span><span class="pa ch _ccc15" style="top:-1.8px;left:37.5px">e</span></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13"> in a new </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:45.059999999999995px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:45.059999999999995px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:45.059999999999995px;height:12px;top:0;left:0"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc15" style="top:-1.8px;left:7.6px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:15.5px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:19.4px">l</span><span class="pa ch _ccc15" style="top:-1.8px;left:23.5px">u</span><span class="pa ch _ccc15" style="top:-1.8px;left:31.8px">r</span><span class="pa ch _ccc15" style="top:-1.8px;left:37.5px">e</span></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13"> with the specified error tag and formatted message, and with a </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-4px;height:15px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:167.74946614583334px;height:15px"><span class="pa ch _ccc13" style="top:-1.8px;left:0px">"</span><span class="pa ch _ccc13" style="top:-1.8px;left:6.4px">C</span><span class="pa ch _ccc13" style="top:-1.8px;left:14.9px">a</span><span class="pa ch _ccc13" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc13" style="top:-1.8px;left:30.8px">s</span><span class="pa ch _ccc13" style="top:-1.8px;left:37.1px">e</span><span class="pa ch _ccc13" style="top:-1.8px;left:44.5px">d</span><span class="pa ch _ccc13" style="top:-1.8px;left:52.8px">B</span><span class="pa ch _ccc13" style="top:-1.8px;left:61.6px">y</span><span class="pa ch _ccc13" style="top:-1.8px;left:68.7px">"</span><span style="display:inline-block;width:2px;top:11px;left:75px" class="pa"></span><span class="pa char _ccc17" style="height:8px;top:3px;left:80.1px"></span><span style="display:inline-block;width:2px;top:11px;left:95.5px" class="pa"></span><span class="pa ch _ccc23" style="top:-1.6px;left:97.5px">o</span><span class="pa ch _ccc23" style="top:-1.6px;left:105px">r</span><span class="pa ch _ccc23" style="top:-1.6px;left:110.9px">i</span><span class="pa ch _ccc23" style="top:-1.6px;left:115.1px">g</span><span class="pa ch _ccc23" style="top:-1.6px;left:122.6px">F</span><span class="pa ch _ccc23" style="top:-1.6px;left:131.9px">a</span><span class="pa ch _ccc23" style="top:-1.6px;left:139.4px">i</span><span class="pa ch _ccc23" style="top:-1.6px;left:143.5px">l</span><span class="pa ch _ccc23" style="top:-1.6px;left:147.7px">u</span><span class="pa ch _ccc23" style="top:-1.6px;left:155.2px">r</span><span class="pa ch _ccc23" style="top:-1.6px;left:161.1px">e</span></div></div></div><span class="_ccc13"> field</span></div></div></div></div></div></div><div class="cell-native" id="cell-fb9cb9e0-e6cd-4665-b1c4-2d16d5e3394e" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="19" data-cache-uuid="fb9cb9e0-e6cd-4665-b1c4-2d16d5e3394e" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div style="padding-top:1px;padding-bottom:1px"><div class="native-layout native-layout-simple" style="margin-top:-2px;margin-bottom:-2px;text-align:left;line-height:21.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:78px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:77.19px;height:14px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">W</span><span class="pa ch _ccc11" style="top:-1.8px;left:12px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:17.6px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:25.4px">p</span><span class="pa ch _ccc11" style="top:-1.8px;left:33.9px">R</span><span class="pa ch _ccc11" style="top:-1.8px;left:42.9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:50.7px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:54.7px">s</span><span class="pa ch _ccc11" style="top:-1.8px;left:61.1px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:68.7px">d</span></div></div></div></div></div></div><span class="_ccc13"> — wrap an uncaught raised </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:45.059999999999995px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:45.059999999999995px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:45.059999999999995px;height:12px;top:0;left:0"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc15" style="top:-1.8px;left:7.6px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:15.5px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:19.4px">l</span><span class="pa ch _ccc15" style="top:-1.8px;left:23.5px">u</span><span class="pa ch _ccc15" style="top:-1.8px;left:31.8px">r</span><span class="pa ch _ccc15" style="top:-1.8px;left:37.5px">e</span></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13"> in a new </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:46px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:45.059999999999995px;height:12px"><a class="GsEf0r4HiEK6fH_vutb_b pa" href="https://reference.wolfram.com/language/ref/Failure.html" style="width:45.059999999999995px;height:12px;top:0;left:0"><div class="TagBoxContainer pa" style="display:inline-block;cursor:pointer;width:45.059999999999995px;height:12px;top:0;left:0"><span class="pa ch _ccc15" style="top:-1.8px;left:0px">F</span><span class="pa ch _ccc15" style="top:-1.8px;left:7.6px">a</span><span class="pa ch _ccc15" style="top:-1.8px;left:15.5px">i</span><span class="pa ch _ccc15" style="top:-1.8px;left:19.4px">l</span><span class="pa ch _ccc15" style="top:-1.8px;left:23.5px">u</span><span class="pa ch _ccc15" style="top:-1.8px;left:31.8px">r</span><span class="pa ch _ccc15" style="top:-1.8px;left:37.5px">e</span></div></a></div></div></div></div></div></div></div></div></div><span class="_ccc13"> with the specified error tag and formatted message, and with a </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-4px;height:15px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:167.74946614583334px;height:15px"><span class="pa ch _ccc13" style="top:-1.8px;left:0px">"</span><span class="pa ch _ccc13" style="top:-1.8px;left:6.4px">C</span><span class="pa ch _ccc13" style="top:-1.8px;left:14.9px">a</span><span class="pa ch _ccc13" style="top:-1.8px;left:22.6px">u</span><span class="pa ch _ccc13" style="top:-1.8px;left:30.8px">s</span><span class="pa ch _ccc13" style="top:-1.8px;left:37.1px">e</span><span class="pa ch _ccc13" style="top:-1.8px;left:44.5px">d</span><span class="pa ch _ccc13" style="top:-1.8px;left:52.8px">B</span><span class="pa ch _ccc13" style="top:-1.8px;left:61.6px">y</span><span class="pa ch _ccc13" style="top:-1.8px;left:68.7px">"</span><span style="display:inline-block;width:2px;top:11px;left:75px" class="pa"></span><span class="pa char _ccc17" style="height:8px;top:3px;left:80.1px"></span><span style="display:inline-block;width:2px;top:11px;left:95.5px" class="pa"></span><span class="pa ch _ccc23" style="top:-1.6px;left:97.5px">o</span><span class="pa ch _ccc23" style="top:-1.6px;left:105px">r</span><span class="pa ch _ccc23" style="top:-1.6px;left:110.9px">i</span><span class="pa ch _ccc23" style="top:-1.6px;left:115.1px">g</span><span class="pa ch _ccc23" style="top:-1.6px;left:122.6px">F</span><span class="pa ch _ccc23" style="top:-1.6px;left:131.9px">a</span><span class="pa ch _ccc23" style="top:-1.6px;left:139.4px">i</span><span class="pa ch _ccc23" style="top:-1.6px;left:143.5px">l</span><span class="pa ch _ccc23" style="top:-1.6px;left:147.7px">u</span><span class="pa ch _ccc23" style="top:-1.6px;left:155.2px">r</span><span class="pa ch _ccc23" style="top:-1.6px;left:161.1px">e</span></div></div></div><span class="_ccc13"> field</span></div></div></div></div></div></div><div class="cell-native" id="cell-3a714d02-e75a-4c46-b568-844f00486269" style="width:100%;min-width:min-content;padding-top:10px;margin-bottom:-1px;box-sizing:border-box;padding-right:31px" data-cache-width="959" data-cache-height="22" data-cache-uuid="3a714d02-e75a-4c46-b568-844f00486269" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:2px;padding-top:0;padding-left:24px;padding-right:24px"><div style="border-top:0.5px solid rgba(200,200,200,1);min-height:12.5px;padding-left:0;padding-right:0;padding-top:10px;padding-bottom:0" class="cell-content"><div class="lines" style="position:relative;width:3.33203125px;height:2px"><span class="pa char _ccc25" style="height:1px;top:0px;left:0px"> </span></div></div></div></div></div><div class="cell-native" id="cell-1bdabc19-21fd-4608-9a78-b11142d581bf" style="width:100%;min-width:min-content;padding-top:18px;padding-bottom:13px;box-sizing:border-box;padding-right:22px" data-cache-width="968" data-cache-height="43" data-cache-uuid="1bdabc19-21fd-4608-9a78-b11142d581bf" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:28.654px"><span class="_ccc27">Built-In Error Types</span></div></div></div></div></div><div class="cell-native" id="cell-94349eb9-524a-4b95-851b-4b42d2d305cc" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:22px" data-cache-width="968" data-cache-height="19" data-cache-uuid="94349eb9-524a-4b95-851b-4b42d2d305cc" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:11px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:101.23400000000001px;height:11px"><span class="pa ch _ccc30" style="top:-2px;left:0px">A</span><span class="pa ch _ccc30" style="top:-2px;left:7.6px">s</span><span class="pa ch _ccc30" style="top:-2px;left:13.5px">s</span><span class="pa ch _ccc30" style="top:-2px;left:19.3px">e</span><span class="pa ch _ccc30" style="top:-2px;left:26.3px">r</span><span class="pa ch _ccc30" style="top:-2px;left:31.2px">t</span><span class="pa ch _ccc30" style="top:-2px;left:35.9px">F</span><span class="pa ch _ccc30" style="top:-2px;left:42.8px">a</span><span class="pa ch _ccc30" style="top:-2px;left:50px">i</span><span class="pa ch _ccc30" style="top:-2px;left:53.4px">l</span><span class="pa ch _ccc30" style="top:-2px;left:57px">e</span><span class="pa ch _ccc30" style="top:-2px;left:63.9px">d</span><span class="pa ch _ccc30" style="top:-2px;left:71.7px">E</span><span class="pa ch _ccc30" style="top:-2px;left:79.1px">r</span><span class="pa ch _ccc30" style="top:-2px;left:83.9px">r</span><span class="pa ch _ccc30" style="top:-2px;left:88.8px">o</span><span class="pa ch _ccc30" style="top:-2px;left:96.4px">r</span></div></div></div><span class="_ccc13"> — error tag raised by </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-1px;height:12px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:75px;height:12px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:74.745px;height:12px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">R</span><span class="pa ch _ccc11" style="top:-1.8px;left:9px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:16.8px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:20.8px">s</span><span class="pa ch _ccc11" style="top:-1.8px;left:27.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:34.8px">A</span><span class="pa ch _ccc11" style="top:-1.8px;left:43.2px">s</span><span class="pa ch _ccc11" style="top:-1.8px;left:49.7px">s</span><span class="pa ch _ccc11" style="top:-1.8px;left:56.1px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:63.7px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:69.3px">t</span></div></div></div></div></div></div></div></div></div></div></div><div class="cell-native" id="cell-6ac30d1c-9802-4f87-accc-d643f097143c" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:22px" data-cache-width="968" data-cache-height="19" data-cache-uuid="6ac30d1c-9802-4f87-accc-d643f097143c" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-4px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:164.26199999999997px;height:14px"><span class="pa ch _ccc30" style="top:-2px;left:0px">D</span><span class="pa ch _ccc30" style="top:-2px;left:8.6px">o</span><span class="pa ch _ccc30" style="top:-2px;left:16.2px">w</span><span class="pa ch _ccc30" style="top:-2px;left:26.3px">n</span><span class="pa ch _ccc30" style="top:-2px;left:33.9px">V</span><span class="pa ch _ccc30" style="top:-2px;left:41.1px">a</span><span class="pa ch _ccc30" style="top:-2px;left:48.3px">l</span><span class="pa ch _ccc30" style="top:-2px;left:51.9px">u</span><span class="pa ch _ccc30" style="top:-2px;left:59.5px">e</span><span class="pa ch _ccc30" style="top:-2px;left:66.4px">F</span><span class="pa ch _ccc30" style="top:-2px;left:73.3px">a</span><span class="pa ch _ccc30" style="top:-2px;left:80.5px">l</span><span class="pa ch _ccc30" style="top:-2px;left:84.1px">l</span><span class="pa ch _ccc30" style="top:-2px;left:87.6px">t</span><span class="pa ch _ccc30" style="top:-2px;left:92.4px">h</span><span class="pa ch _ccc30" style="top:-2px;left:100px">r</span><span class="pa ch _ccc30" style="top:-2px;left:104.8px">o</span><span class="pa ch _ccc30" style="top:-2px;left:112.4px">u</span><span class="pa ch _ccc30" style="top:-2px;left:120px">g</span><span class="pa ch _ccc30" style="top:-2px;left:127.1px">h</span><span class="pa ch _ccc30" style="top:-2px;left:134.7px">E</span><span class="pa ch _ccc30" style="top:-2px;left:142.1px">r</span><span class="pa ch _ccc30" style="top:-2px;left:147px">r</span><span class="pa ch _ccc30" style="top:-2px;left:151.8px">o</span><span class="pa ch _ccc30" style="top:-2px;left:159.4px">r</span></div></div></div><span class="_ccc13"> — error tag raised by </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-4px;height:15px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:131px;height:15px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:130.035px;height:15px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">S</span><span class="pa ch _ccc11" style="top:-1.8px;left:8.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:15.8px">t</span><span class="pa ch _ccc11" style="top:-1.8px;left:21.2px">F</span><span class="pa ch _ccc11" style="top:-1.8px;left:28.8px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:36.7px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:40.8px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:44.8px">t</span><span class="pa ch _ccc11" style="top:-1.8px;left:50.2px">h</span><span class="pa ch _ccc11" style="top:-1.8px;left:58.6px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:64.2px">o</span><span class="pa ch _ccc11" style="top:-1.8px;left:72.4px">u</span><span class="pa ch _ccc11" style="top:-1.8px;left:80.8px">g</span><span class="pa ch _ccc11" style="top:-1.8px;left:88.6px">h</span><span class="pa ch _ccc11" style="top:-1.8px;left:96.9px">E</span><span class="pa ch _ccc11" style="top:-1.8px;left:105px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:110.6px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:116.2px">o</span><span class="pa ch _ccc11" style="top:-1.8px;left:124.4px">r</span></div></div></div></div></div></div><span class="_ccc13"> functions on fallthrough</span></div></div></div></div></div><div class="cell-native" id="cell-36114f6f-f9a6-4db5-a6aa-2762ac1d87b6" style="width:100%;min-width:min-content;padding-top:1px;padding-bottom:6px;box-sizing:border-box;padding-right:22px" data-cache-width="968" data-cache-height="19" data-cache-uuid="36114f6f-f9a6-4db5-a6aa-2762ac1d87b6" data-show-c2c="false"><div class="cell-wrapper"><div class="HExNUSO6Shz5hgqMOEW9X" style="position:absolute;left:0;top:0"></div><div style="width:100%;box-sizing:border-box;min-height:12px;padding-top:0;padding-left:24px;padding-right:24px"><div style="min-height:12px;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0" class="cell-content"><div class="native-layout native-layout-simple" style="text-align:left;line-height:19.855px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:123.69000000000001px;height:14px"><span class="pa ch _ccc30" style="top:-1px;left:0px">C</span><span class="pa ch _ccc30" style="top:-1px;left:8px">o</span><span class="pa ch _ccc30" style="top:-1px;left:15.6px">n</span><span class="pa ch _ccc30" style="top:-1px;left:23.2px">f</span><span class="pa ch _ccc30" style="top:-1px;left:27.3px">i</span><span class="pa ch _ccc30" style="top:-1px;left:30.8px">r</span><span class="pa ch _ccc30" style="top:-1px;left:35.6px">m</span><span class="pa ch _ccc30" style="top:-1px;left:47.2px">R</span><span class="pa ch _ccc30" style="top:-1px;left:55.4px">e</span><span class="pa ch _ccc30" style="top:-1px;left:62.3px">p</span><span class="pa ch _ccc30" style="top:-1px;left:70.1px">l</span><span class="pa ch _ccc30" style="top:-1px;left:73.7px">a</span><span class="pa ch _ccc30" style="top:-1px;left:80.8px">c</span><span class="pa ch _ccc30" style="top:-1px;left:87.2px">e</span><span class="pa ch _ccc30" style="top:-1px;left:94.2px">E</span><span class="pa ch _ccc30" style="top:-1px;left:101.5px">r</span><span class="pa ch _ccc30" style="top:-1px;left:106.4px">r</span><span class="pa ch _ccc30" style="top:-1px;left:111.2px">o</span><span class="pa ch _ccc30" style="top:-1px;left:118.8px">r</span></div></div></div><span class="_ccc13"> — error tag raised by </span><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;vertical-align:-3px;height:14px"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0;float:left"><div class="lines" style="position:relative;width:104px;height:14px"><div style="display:inline-block;margin-left:0;margin-right:0;margin-top:0;margin-bottom:0;top:0;left:0" class="pa"><div style="display:block;border-left-width:0;border-right-width:0;border-top-width:0;border-bottom-width:0;border-style:solid;padding-left:0;padding-right:0;padding-top:0;padding-bottom:0"><div class="lines" style="position:relative;width:103.69499999999998px;height:14px"><span class="pa ch _ccc11" style="top:-1.8px;left:0px">C</span><span class="pa ch _ccc11" style="top:-1.8px;left:8.6px">o</span><span class="pa ch _ccc11" style="top:-1.8px;left:16.9px">n</span><span class="pa ch _ccc11" style="top:-1.8px;left:25.3px">f</span><span class="pa ch _ccc11" style="top:-1.8px;left:30px">i</span><span class="pa ch _ccc11" style="top:-1.8px;left:34px">r</span><span class="pa ch _ccc11" style="top:-1.8px;left:39.6px">m</span><span class="pa ch _ccc11" style="top:-1.8px;left:52.2px">R</span><span class="pa ch _ccc11" style="top:-1.8px;left:61.2px">e</span><span class="pa ch _ccc11" style="top:-1.8px;left:68.8px">p</span><span class="pa ch _ccc11" style="top:-1.8px;left:77.2px">l</span><span class="pa ch _ccc11" style="top:-1.8px;left:81.3px">a</span><span class="pa ch _ccc11" style="top:-1.8px;left:89.2px">c</span><span class="pa ch _ccc11" style="top:-1.8px;left:96.1px">e</span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div> </div>  </div> <script crossorigin src="https://www.wolframcdn.com/notebook-embedder/0.3/wolfram-notebook-embedder.min.js"></script> <script> WolframNotebookEmbedder.embed('https://www.wolframcloud.com/obj/resourcesystem/marketplacestorage/resources/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/data/versions/0-1-2/2aa6c406e834a40e/data/MainGuidePage.nb', document.getElementById('notebook-embed')); </script> </div> </div> <div class="col main"> <div class="nb-collapse label example-heading" role="button" tabindex="0" data-toggle="collapse" data-target="#nbCollapseExampleNotebook" aria-expanded="true" aria-controls="nbCollapseExampleNotebook" > <h2 id="Examples">Examples</h2> <span id="open-close-all-examples"></span> </div> <div id="example-notebook-buttons" class="notebook-dropdown frame"> <button class="notebook-dropdown toggle collapsed" data-toggle="collapse" data-target="#example-notebook-list" aria-controls="example-notebook-list" > <svg xmlns="http://www.w3.org/2000/svg" class="notebook-download" width="26" height="32" viewBox="0 0 26 32" role="presentation" > <path class="fill" fill="#4c89ae" d="M3.5 0C2.3 0 1.27.86 1.04 2H0v3h1v1H0v3h1v1H0v3h1v1H0v3h1v1H0v3h1v1H0v3h1v1H0v3h1v.5C1 30.9 2.12 32 3.5 32h20c1.4 0 2.5-1.1 2.5-2.5v-27C26 1.1 24.88 0 23.5 0h-20zm0 .98h20c.85 0 1.52.67 1.52 1.5v26.03c0 .85-.67 1.52-1.5 1.52H3.48c-.85 0-1.52-.67-1.52-1.5V2.48c0-.85.67-1.52 1.5-1.52zM19.54 15.15L22 12.4l-3.6-.77.36-3.64-3.4 1.46L13.5 6.3l-1.87 3.16L8.25 8l.37 3.63L5 12.4l2.46 2.75L5 17.88l3.6.78-.36 3.65 3.4-1.47L13.5 24l1.87-3.16 3.38 1.47-.37-3.64L22 17.9zm.65 1.77l-1.66-.56-1.12-1.45 1.44.55zm-5.3 3.38l-1.02 1.73v-1.8l1.06-1.53zm-2.42-8.95l-1.75-.6-1-1.36 1.83.8zm2.96-1.16l1.84-.8-1 1.34-1.76.6zm2.23 1.58l-.9 1.25.06-1.88 1.04-1.4zM13.5 19.5l-1.36-1.95 1.36-1.83 1.36 1.83zm-2.56-5.6l-.07-2.37 2.27.8v2.32zm2.94-1.57l2.26-.8-.06 2.38-2.2.75v-2.32zm-4.55-.55l-.2-2.02 1.04 1.4.05 1.87zm3.6 3.53l-1.36 1.84-2.3-.68 1.46-1.9zm-.85 3.4l1.06 1.53v1.8l-1.02-1.73zm2-3.4l2.2-.73 1.46 1.9-2.3.67zm6.6-2.46l-1.7 1.9-2.03-.74 1.2-1.7zM13.5 7.67l1.3 2.2-1.3 1.65-1.3-1.65zm-7.18 5.17l2.52-.55 1.2 1.7-2 .74zm1.82 2.6l1.44-.53-1.12 1.46-1.65.56zM6.96 17.6l1.7-.58 1.85.53-1.53.48zm2.36 1.05l2.05-.64.05 2.17-2.36 1.02zm6.26 1.52l.05-2.16 2.05.65.26 2.54zm2.44-2.14l-1.53-.48 1.82-.53 1.72.58z" /> </svg> <span class="text">Example Notebook</span> </button> <div id="example-notebook-list" class="collapse"> <ul class="notebook-dropdown list"> <li> <a href="https://www.wolframcloud.com/env/be1c2035-9938-472f-91e5-9dbc4a11de83?src=CloudBasicCopiedContent#sidebar=basic-notebook-links">Open in Cloud</a> </li> <li> <a href="https://www.wolframcloud.com/download/be1c2035-9938-472f-91e5-9dbc4a11de83?extension=always&filename=Wolfram%2FErrorTools-0-1-2-examples">Download Notebook</a> </li> </ul> </div> </div> <div id="nbCollapseExampleNotebook" class="nb-collapse content collapse in" aria-expanded="true" >  <div class='example-notebook'><div class='subsection cell-group'><h3 id='462042388'>Basic Examples <span class='total-examples'>(4)</span> </h3><p class='example-text' id='1170270518'>Register a new error tag:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='751942465'><tr><td class='in-out'>In[1]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/3f02561dca31b05f.png' alt='CreateErrorType[MyError, {}]' width='181' height='19' style='width: 11.3125em; height: 1.1875em;' /></div></td></tr></table><table class='example output' id='5294583'><tr><td class='in-out'>Out[1]=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/10c18857e53f53fe.png' width='190' height='47' style='width: 11.8750em; height: 2.9375em;' /></div></td></tr></table></div><p class='example-text' id='1811021283'>Create a new <span class='inline-formula'><a class='reflink' href='https://reference.wolfram.com/language/ref/Failure.html'><span class='symbol'>Failure</span></a><span class='charRawLeftBracket'>[</span>..<span class='charRawRightBracket'>]</span></span> with the specified tag:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='1996272315'><tr><td class='in-out'>In[2]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/12feb7d1deee24ff.png' alt='CreateFailure[MyError, "An error occurred at ``", DateString[]]' width='395' height='23' style='width: 24.6875em; height: 1.4375em;' /></div></td></tr></table><table class='example output' id='1930881615'><tr><td class='in-out'>Out[2]=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/245e94432126513f.png' width='400' height='48' style='width: 25.0000em; height: 3.0000em;' /></div></td></tr></table></div><p class='example-text' id='2031277790'>Construct and throw a <span class='inline-formula'><a class='reflink' href='https://reference.wolfram.com/language/ref/Failure.html'><span class='symbol'>Failure</span></a><span class='charRawLeftBracket'>[</span>..<span class='charRawRightBracket'>]</span></span> as an exception, without handling the failure:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='923146044'><tr><td class='in-out'>In[3]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/13759a9cb28760d6.png' alt='Raise[MyError, "Uh oh!"]' width='155' height='23' style='width: 9.6875em; height: 1.4375em;' /></div></td></tr></table><div class='message' id='1881753622'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/4c7c93c507e64f98.png' width='630' height='38' style='width: 39.3750em; height: 2.3750em;' /></div><table class='example output' id='641455585'><tr><td class='in-out'>Out[3]=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/3b294b2f2a9c6265.png' width='365' height='48' style='width: 22.8125em; height: 3.0000em;' /></div></td></tr></table></div><p class='example-text' id='576109155'>Handle the raised <span class='inline-formula'><a class='reflink' href='https://reference.wolfram.com/language/ref/Failure.html'><span class='symbol'>Failure</span></a></span>:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='1705446429'><tr><td class='in-out'>In[4]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/0845cbf887e9e534.png' alt='Handle[Raise[MyError, "Uh oh!"], FailurePattern[MyError]]' width='367' height='23' style='width: 22.9375em; height: 1.4375em;' /></div></td></tr></table><table class='example output' id='87259806'><tr><td class='in-out'>Out[4]=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/26456ee05a26b1bc.png' width='189' height='48' style='width: 11.8125em; height: 3.0000em;' /></div></td></tr></table></div></div><div class='subsection cell-group'><h3 id='964056545'>Scope <span class='total-examples'>(2)</span> </h3><p class='example-text' id='1325293248'>Define a function that can raise multiple types of failure:</p><table class='example input' data-show-self-anchor-link='true' id='204575504'><tr><td class='in-out'>In[5]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/05f9be3420478335.png' alt='foo[cond_] := If[cond, Raise[MyError, "Uh oh!"] , Raise[OtherError, "Uh oh!"] ]' width='223' height='130' style='width: 13.9375em; height: 8.1250em;' /></div></td></tr></table><p class='example-text' id='391444726'>Handle any type of failure:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='828793461'><tr><td class='in-out'>In[6]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/65890a5bd1ff17a1.png' alt='Handle[foo[True], _Failure]' width='169' height='19' style='width: 10.5625em; height: 1.1875em;' /></div></td></tr></table><table class='example output' id='1958918355'><tr><td class='in-out'>Out[6]=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/6e20d2caaac61858.png' width='189' height='48' style='width: 11.8125em; height: 3.0000em;' /></div></td></tr></table></div><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='486409628'><tr><td class='in-out'>In[7]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/16b77b4342786e69.png' alt='Handle[foo[False], _Failure]' width='173' height='19' style='width: 10.8125em; height: 1.1875em;' /></div></td></tr></table><table class='example output' id='664304710'><tr><td class='in-out'>Out[7]=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/2a0b989fa936b403.png' width='203' height='48' style='width: 12.6875em; height: 3.0000em;' /></div></td></tr></table></div><p class='example-text' id='498105847'>Handle only <span class='inline-formula'><a class='reflink' href='https://reference.wolfram.com/language/ref/Failure.html'><span class='symbol'>Failure</span></a></span>'s with a specific tag:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='493702702'><tr><td class='in-out'>In[8]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/692a60620f77a8b3.png' alt='Handle[foo[True], { f : FailurePattern[MyError] :> Print["Failed due to MyError: ", f] }]' width='442' height='79' style='width: 27.6250em; height: 4.9375em;' /></div></td></tr></table><div class='print' id='934645252'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/1b64735306771a68.png' width='289' height='47' style='width: 18.0625em; height: 2.9375em;' /></div></div><p class='example-text' id='1097187734'>Handle does not catch a <span class='inline-formula'><a class='reflink' href='https://reference.wolfram.com/language/ref/Failure.html'><span class='symbol'>Failure</span></a></span> if no handler rule matches it:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='1887356206'><tr><td class='in-out'>In[9]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/4b019d674fa25152.png' alt='Handle[foo[False], { f : FailurePattern[MyError] :> Print["Failed due to MyError: ", f] }]' width='442' height='79' style='width: 27.6250em; height: 4.9375em;' /></div></td></tr></table><div class='message' id='862005756'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/7dcd851abd50fb69.png' width='643' height='38' style='width: 40.1875em; height: 2.3750em;' /></div><table class='example output' id='806058430'><tr><td class='in-out'>Out[9]=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/3eec9ee537b1a397.png' width='379' height='48' style='width: 23.6875em; height: 3.0000em;' /></div></td></tr></table></div><hr class='example-delimiter' id='621825633' /><p class='example-text' id='1658062430'>Define a function that throws an error when called with unexpected arguments:</p><table class='example input' data-show-self-anchor-link='true' id='1920369860'><tr><td class='in-out'>In[10]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/5c88e1e28d8b18e3.png' alt='SetFallthroughError[SayHello]' width='191' height='19' style='width: 11.9375em; height: 1.1875em;' /></div></td></tr></table><table class='example input' data-show-self-anchor-link='true' id='1395267745'><tr><td class='in-out'>In[11]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/70b8bcd053150118.png' alt='SayHello[name_?StringQ] := Print["Hello, ", name, "!"]' width='342' height='23' style='width: 21.3750em; height: 1.4375em;' /></div></td></tr></table><p class='example-text' id='297813438'>Say hello with a valid string argument:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='2112642712'><tr><td class='in-out'>In[12]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/532037ec1062c34e.png' alt='SayHello["John"]' width='110' height='19' style='width: 6.8750em; height: 1.1875em;' /></div></td></tr></table><div class='print' id='2068252078'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/6cf646abdb2a41d7.png' width='61' height='16' style='width: 3.8125em; height: 1.0000em;' /></div></div><p class='example-text' id='1942364604'>Try to say hello with an invalid argument:</p><div class='example-frame'><table class='example input' data-show-self-anchor-link='true' id='972821273'><tr><td class='in-out'>In[13]:=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/3c5d6c77b13fee0f.png' alt='SayHello[2 + 2]' width='91' height='19' style='width: 5.6875em; height: 1.1875em;' /></div></td></tr></table><div class='message' id='834638767'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/3bb6fc7a87daa98a.png' width='562' height='58' style='width: 35.1250em; height: 3.6250em;' /></div><table class='example output' id='410574765'><tr><td class='in-out'>Out[13]=</td><td><div class='img-frame'><img src='https://www.wolframcloud.com/obj/resourcesystem/images/b64/b64c5bf2-c56b-4855-9ffd-9e709646e40f/680a24d742059415.png' width='612' height='76' style='width: 38.2500em; height: 4.7500em;' /></div></td></tr></table></div></div></div>  </div> <h2 id="Disclosures">Disclosures</h2> <ul> <li>Wolfram Language built-in symbols</li> <li> <a href="https://resources.wolframcloud.com/PacletRepository/disclosures" 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