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check fails then a <a class="link" href="glib-Message-Logging.html#g-critical" title="g_critical()"><code class="function">g_critical()</code></a> is printed and <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.</p>
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<p>This function is meant to be used by functions that wish to provide
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varargs accessors to <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> values of uncertain values (eg:
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<a class="link" href="glib-GVariant.html#g-variant-lookup" title="g_variant_lookup ()"><code class="function">g_variant_lookup()</code></a> or <a href="http://library.gnome.org/devel/gio/unstable/GMenuModel.html#g-menu-model-get-item-attribute"><code class="function">g_menu_model_get_item_attribute()</code></a>).</p>
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<a name="id-1.6.19.7.13.7"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">