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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `set_global_default` fn in crate `tracing`."><meta name="keywords" content="rust, rustlang, rust-lang, set_global_default"><title>tracing::subscriber::set_global_default - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">tracing</a>::<wbr><a href="index.html">subscriber</a>::<wbr><a class="fn" href="">set_global_default</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/tracing/subscriber.rs.html#39-44" title="goto source code">[src]</a></span></h1><pre class="rust fn">pub fn set_global_default&lt;S&gt;(subscriber: S) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../../tracing/subscriber/struct.SetGlobalDefaultError.html" title="struct tracing::subscriber::SetGlobalDefaultError">SetGlobalDefaultError</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;S: <a class="trait" href="../../tracing/trait.Subscriber.html" title="trait tracing::Subscriber">Subscriber</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,&nbsp;</span></pre><div class="docblock"><p>Sets this subscriber as the global default for the duration of the entire program.
Will be used as a fallback if no thread-local subscriber has been set in a thread (using <code>with_default</code>.)</p>
<p>Can only be set once; subsequent attempts to set the global default will fail.
Returns whether the initialization was successful.</p>
<p>Note: Libraries should <em>NOT</em> call <code>set_global_default()</code>! That will cause conflicts when
executables try to set them later.</p>
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