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 </pre><pre class="rust"><code><span class="comment">// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license
 // &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.

 </span><span class="doccomment">//! A lightweight logging facade.
 //!
 //! The `log` crate provides a single logging API that abstracts over the
 //! actual logging implementation. Libraries can use the logging API provided
 //! by this crate, and the consumer of those libraries can choose the logging
 //! implementation that is most suitable for its use case.
 //!
 //! If no logging implementation is selected, the facade falls back to a &quot;noop&quot;
 //! implementation that ignores all log messages. The overhead in this case
 //! is very small - just an integer load, comparison and jump.
 //!
 //! A log request consists of a _target_, a _level_, and a _body_. A target is a
 //! string which defaults to the module path of the location of the log request,
 //! though that default may be overridden. Logger implementations typically use
 //! the target to filter requests based on some user configuration.
 //!
 //! # Usage
 //!
 //! The basic use of the log crate is through the five logging macros: [`error!`],
 //! [`warn!`], [`info!`], [`debug!`] and [`trace!`]
 //! where `error!` represents the highest-priority log messages
 //! and `trace!` the lowest. The log messages are filtered by configuring
 //! the log level to exclude messages with a lower priority.
 //! Each of these macros accept format strings similarly to [`println!`].
 //!
 //!
 //! [`error!`]: ./macro.error.html
 //! [`warn!`]: ./macro.warn.html
 //! [`info!`]: ./macro.info.html
 //! [`debug!`]: ./macro.debug.html
 //! [`trace!`]: ./macro.trace.html
 //! [`println!`]: https://doc.rust-lang.org/stable/std/macro.println.html
 //!
 //! ## In libraries
 //!
 //! Libraries should link only to the `log` crate, and use the provided
 //! macros to log whatever information will be useful to downstream consumers.
 //!
 //! ### Examples
 //!
 //! ```edition2018
 //! # #[derive(Debug)] pub struct Yak(String);
 //! # impl Yak { fn shave(&amp;mut self, _: u32) {} }
 //! # fn find_a_razor() -&gt; Result&lt;u32, u32&gt; { Ok(1) }
 //! use log::{info, warn};
 //!
 //! pub fn shave_the_yak(yak: &amp;mut Yak) {
 //!     info!(target: &quot;yak_events&quot;, &quot;Commencing yak shaving for {:?}&quot;, yak);
 //!
 //!     loop {
 //!         match find_a_razor() {
 //!             Ok(razor) =&gt; {
 //!                 info!(&quot;Razor located: {}&quot;, razor);
 //!                 yak.shave(razor);
 //!                 break;
 //!             }
 //!             Err(err) =&gt; {
 //!                 warn!(&quot;Unable to locate a razor: {}, retrying&quot;, err);
 //!             }
 //!         }
 //!     }
 //! }
 //! # fn main() {}
 //! ```
 //!
 //! ## In executables
 //!
 //! Executables should choose a logging implementation and initialize it early in the
 //! runtime of the program. Logging implementations will typically include a
 //! function to do this. Any log messages generated before
 //! the implementation is initialized will be ignored.
 //!
 //! The executable itself may use the `log` crate to log as well.
 //!
 //! ### Warning
 //!
 //! The logging system may only be initialized once.
 //!
 //! ## Structured logging
 //!
 //! If you enable the `kv_unstable` feature you can associate structured values
 //! with your log records. If we take the example from before, we can include
 //! some additional context besides what&#39;s in the formatted message:
 //!
 //! ```edition2018
 //! # #[macro_use] extern crate serde;
 //! # #[derive(Debug, Serialize)] pub struct Yak(String);
 //! # impl Yak { fn shave(&amp;mut self, _: u32) {} }
 //! # fn find_a_razor() -&gt; Result&lt;u32, std::io::Error&gt; { Ok(1) }
 //! # #[cfg(feature = &quot;kv_unstable_serde&quot;)]
 //! # fn main() {
 //! use log::{info, warn, as_serde, as_error};
 //!
 //! pub fn shave_the_yak(yak: &amp;mut Yak) {
 //!     info!(target: &quot;yak_events&quot;, yak = as_serde!(yak); &quot;Commencing yak shaving&quot;);
 //!
 //!     loop {
 //!         match find_a_razor() {
 //!             Ok(razor) =&gt; {
 //!                 info!(razor = razor; &quot;Razor located&quot;);
 //!                 yak.shave(razor);
 //!                 break;
 //!             }
 //!             Err(err) =&gt; {
 //!                 warn!(err = as_error!(err); &quot;Unable to locate a razor, retrying&quot;);
 //!             }
 //!         }
 //!     }
 //! }
 //! # }
 //! # #[cfg(not(feature = &quot;kv_unstable_serde&quot;))]
 //! # fn main() {}
 //! ```
 //!
 //! # Available logging implementations
 //!
 //! In order to produce log output executables have to use
 //! a logger implementation compatible with the facade.
 //! There are many available implementations to choose from,
 //! here are some of the most popular ones:
 //!
 //! * Simple minimal loggers:
 //!     * [env_logger]
 //!     * [simple_logger]
 //!     * [simplelog]
 //!     * [pretty_env_logger]
 //!     * [stderrlog]
 //!     * [flexi_logger]
 //!     * [call_logger]
 //! * Complex configurable frameworks:
 //!     * [log4rs]
 //!     * [fern]
 //! * Adaptors for other facilities:
 //!     * [syslog]
 //!     * [slog-stdlog]
 //!     * [systemd-journal-logger]
 //!     * [android_log]
 //!     * [win_dbg_logger]
 //!     * [db_logger]
 //! * For WebAssembly binaries:
 //!     * [console_log]
 //! * For dynamic libraries:
 //!     * You may need to construct an FFI-safe wrapper over `log` to initialize in your libraries
 //!
 //! # Implementing a Logger
 //!
 //! Loggers implement the [`Log`] trait. Here&#39;s a very basic example that simply
 //! logs all messages at the [`Error`][level_link], [`Warn`][level_link] or
 //! [`Info`][level_link] levels to stdout:
 //!
 //! ```edition2018
 //! use log::{Record, Level, Metadata};
 //!
 //! struct SimpleLogger;
 //!
 //! impl log::Log for SimpleLogger {
 //!     fn enabled(&amp;self, metadata: &amp;Metadata) -&gt; bool {
 //!         metadata.level() &lt;= Level::Info
 //!     }
 //!
 //!     fn log(&amp;self, record: &amp;Record) {
 //!         if self.enabled(record.metadata()) {
 //!             println!(&quot;{} - {}&quot;, record.level(), record.args());
 //!         }
 //!     }
 //!
 //!     fn flush(&amp;self) {}
 //! }
 //!
 //! # fn main() {}
 //! ```
 //!
 //! Loggers are installed by calling the [`set_logger`] function. The maximum
 //! log level also needs to be adjusted via the [`set_max_level`] function. The
 //! logging facade uses this as an optimization to improve performance of log
 //! messages at levels that are disabled. It&#39;s important to set it, as it
 //! defaults to [`Off`][filter_link], so no log messages will ever be captured!
 //! In the case of our example logger, we&#39;ll want to set the maximum log level
 //! to [`Info`][filter_link], since we ignore any [`Debug`][level_link] or
 //! [`Trace`][level_link] level log messages. A logging implementation should
 //! provide a function that wraps a call to [`set_logger`] and
 //! [`set_max_level`], handling initialization of the logger:
 //!
 //! ```edition2018
 //! # use log::{Level, Metadata};
 //! # struct SimpleLogger;
 //! # impl log::Log for SimpleLogger {
 //! #   fn enabled(&amp;self, _: &amp;Metadata) -&gt; bool { false }
 //! #   fn log(&amp;self, _: &amp;log::Record) {}
 //! #   fn flush(&amp;self) {}
 //! # }
 //! # fn main() {}
 //! use log::{SetLoggerError, LevelFilter};
 //!
 //! static LOGGER: SimpleLogger = SimpleLogger;
 //!
 //! pub fn init() -&gt; Result&lt;(), SetLoggerError&gt; {
 //!     log::set_logger(&amp;LOGGER)
 //!         .map(|()| log::set_max_level(LevelFilter::Info))
 //! }
 //! ```
 //!
 //! Implementations that adjust their configurations at runtime should take care
 //! to adjust the maximum log level as well.
 //!
 //! # Use with `std`
 //!
 //! `set_logger` requires you to provide a `&amp;&#39;static Log`, which can be hard to
 //! obtain if your logger depends on some runtime configuration. The
 //! `set_boxed_logger` function is available with the `std` Cargo feature. It is
 //! identical to `set_logger` except that it takes a `Box&lt;Log&gt;` rather than a
 //! `&amp;&#39;static Log`:
 //!
 //! ```edition2018
 //! # use log::{Level, LevelFilter, Log, SetLoggerError, Metadata};
 //! # struct SimpleLogger;
 //! # impl log::Log for SimpleLogger {
 //! #   fn enabled(&amp;self, _: &amp;Metadata) -&gt; bool { false }
 //! #   fn log(&amp;self, _: &amp;log::Record) {}
 //! #   fn flush(&amp;self) {}
 //! # }
 //! # fn main() {}
 //! # #[cfg(feature = &quot;std&quot;)]
 //! pub fn init() -&gt; Result&lt;(), SetLoggerError&gt; {
 //!     log::set_boxed_logger(Box::new(SimpleLogger))
 //!         .map(|()| log::set_max_level(LevelFilter::Info))
 //! }
 //! ```
 //!
 //! # Compile time filters
 //!
 //! Log levels can be statically disabled at compile time via Cargo features. Log invocations at
 //! disabled levels will be skipped and will not even be present in the resulting binary.
 //! This level is configured separately for release and debug builds. The features are:
 //!
 //! * `max_level_off`
 //! * `max_level_error`
 //! * `max_level_warn`
 //! * `max_level_info`
 //! * `max_level_debug`
 //! * `max_level_trace`
 //! * `release_max_level_off`
 //! * `release_max_level_error`
 //! * `release_max_level_warn`
 //! * `release_max_level_info`
 //! * `release_max_level_debug`
 //! * `release_max_level_trace`
 //!
 //! These features control the value of the `STATIC_MAX_LEVEL` constant. The logging macros check
 //! this value before logging a message. By default, no levels are disabled.
 //!
 //! Libraries should avoid using the max level features because they&#39;re global and can&#39;t be changed
 //! once they&#39;re set.
 //!
 //! For example, a crate can disable trace level logs in debug builds and trace, debug, and info
 //! level logs in release builds with the following configuration:
 //!
 //! ```toml
 //! [dependencies]
 //! log = { version = &quot;0.4&quot;, features = [&quot;max_level_debug&quot;, &quot;release_max_level_warn&quot;] }
 //! ```
 //! # Crate Feature Flags
 //!
 //! The following crate feature flags are available in addition to the filters. They are
 //! configured in your `Cargo.toml`.
 //!
 //! * `std` allows use of `std` crate instead of the default `core`. Enables using `std::error` and
 //! `set_boxed_logger` functionality.
 //! * `serde` enables support for serialization and deserialization of `Level` and `LevelFilter`.
 //!
 //! ```toml
 //! [dependencies]
 //! log = { version = &quot;0.4&quot;, features = [&quot;std&quot;, &quot;serde&quot;] }
 //! ```
 //!
 //! # Version compatibility
 //!
 //! The 0.3 and 0.4 versions of the `log` crate are almost entirely compatible. Log messages
 //! made using `log` 0.3 will forward transparently to a logger implementation using `log` 0.4. Log
 //! messages made using `log` 0.4 will forward to a logger implementation using `log` 0.3, but the
 //! module path and file name information associated with the message will unfortunately be lost.
 //!
 //! [`Log`]: trait.Log.html
 //! [level_link]: enum.Level.html
 //! [filter_link]: enum.LevelFilter.html
 //! [`set_logger`]: fn.set_logger.html
 //! [`set_max_level`]: fn.set_max_level.html
 //! [`try_set_logger_raw`]: fn.try_set_logger_raw.html
 //! [`shutdown_logger_raw`]: fn.shutdown_logger_raw.html
 //! [env_logger]: https://docs.rs/env_logger/*/env_logger/
 //! [simple_logger]: https://github.com/borntyping/rust-simple_logger
 //! [simplelog]: https://github.com/drakulix/simplelog.rs
 //! [pretty_env_logger]: https://docs.rs/pretty_env_logger/*/pretty_env_logger/
 //! [stderrlog]: https://docs.rs/stderrlog/*/stderrlog/
 //! [flexi_logger]: https://docs.rs/flexi_logger/*/flexi_logger/
 //! [call_logger]: https://docs.rs/call_logger/*/call_logger/
 //! [syslog]: https://docs.rs/syslog/*/syslog/
 //! [slog-stdlog]: https://docs.rs/slog-stdlog/*/slog_stdlog/
 //! [log4rs]: https://docs.rs/log4rs/*/log4rs/
 //! [fern]: https://docs.rs/fern/*/fern/
 //! [systemd-journal-logger]: https://docs.rs/systemd-journal-logger/*/systemd_journal_logger/
 //! [android_log]: https://docs.rs/android_log/*/android_log/
 //! [win_dbg_logger]: https://docs.rs/win_dbg_logger/*/win_dbg_logger/
 //! [db_logger]: https://docs.rs/db_logger/*/db_logger/
 //! [console_log]: https://docs.rs/console_log/*/console_log/

 </span><span class="attribute">#![doc(
     html_logo_url = <span class="string">&quot;https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png&quot;</span>,
     html_favicon_url = <span class="string">&quot;https://www.rust-lang.org/favicon.ico&quot;</span>,
     html_root_url = <span class="string">&quot;https://docs.rs/log/0.4.18&quot;
 </span>)]
 #![warn(missing_docs)]
 #![deny(missing_debug_implementations, unconditional_recursion)]
 #![cfg_attr(all(not(feature = <span class="string">&quot;std&quot;</span>), not(test)), no_std)]
 </span><span class="comment">// When compiled for the rustc compiler itself we want to make sure that this is
 // an unstable crate
 </span><span class="attribute">#![cfg_attr(rustbuild, feature(staged_api, rustc_private))]
 #![cfg_attr(rustbuild, unstable(feature = <span class="string">&quot;rustc_private&quot;</span>, issue = <span class="string">&quot;27812&quot;</span>))]

 #[cfg(all(not(feature = <span class="string">&quot;std&quot;</span>), not(test)))]
 </span><span class="kw">extern crate </span>core <span class="kw">as </span>std;

 <span class="kw">use </span>std::cmp;
 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">use </span>std::error;
 <span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::mem;
 <span class="kw">use </span>std::str::FromStr;

 <span class="attribute">#[macro_use]
 </span><span class="kw">mod </span>macros;
 <span class="kw">mod </span>serde;

 <span class="attribute">#[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
 </span><span class="kw">pub mod </span>kv;

 <span class="attribute">#[cfg(has_atomics)]
 </span><span class="kw">use </span>std::sync::atomic::{AtomicUsize, Ordering};

 <span class="attribute">#[cfg(not(has_atomics))]
 </span><span class="kw">use </span>std::cell::Cell;
 <span class="attribute">#[cfg(not(has_atomics))]
 </span><span class="kw">use </span>std::sync::atomic::Ordering;

 <span class="attribute">#[cfg(not(has_atomics))]
 </span><span class="kw">struct </span>AtomicUsize {
     v: Cell&lt;usize&gt;,
 }

 <span class="attribute">#[cfg(not(has_atomics))]
 </span><span class="kw">impl </span>AtomicUsize {
     <span class="kw">const fn </span>new(v: usize) -&gt; AtomicUsize {
         AtomicUsize { v: Cell::new(v) }
     }

     <span class="kw">fn </span>load(<span class="kw-2">&amp;</span><span class="self">self</span>, _order: Ordering) -&gt; usize {
         <span class="self">self</span>.v.get()
     }

     <span class="kw">fn </span>store(<span class="kw-2">&amp;</span><span class="self">self</span>, val: usize, _order: Ordering) {
         <span class="self">self</span>.v.set(val)
     }

     <span class="attribute">#[cfg(atomic_cas)]
     </span><span class="kw">fn </span>compare_exchange(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         current: usize,
         new: usize,
         _success: Ordering,
         _failure: Ordering,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;usize, usize&gt; {
         <span class="kw">let </span>prev = <span class="self">self</span>.v.get();
         <span class="kw">if </span>current == prev {
             <span class="self">self</span>.v.set(new);
         }
         <span class="prelude-val">Ok</span>(prev)
     }
 }

 <span class="comment">// Any platform without atomics is unlikely to have multiple cores, so
 // writing via Cell will not be a race condition.
 </span><span class="attribute">#[cfg(not(has_atomics))]
 </span><span class="kw">unsafe impl </span>Sync <span class="kw">for </span>AtomicUsize {}

 <span class="comment">// The LOGGER static holds a pointer to the global logger. It is protected by
 // the STATE static which determines whether LOGGER has been initialized yet.
 </span><span class="kw">static </span><span class="kw-2">mut </span>LOGGER: <span class="kw-2">&amp;</span><span class="kw">dyn </span>Log = <span class="kw-2">&amp;</span>NopLogger;

 <span class="kw">static </span>STATE: AtomicUsize = AtomicUsize::new(<span class="number">0</span>);

 <span class="comment">// There are three different states that we care about: the logger&#39;s
 // uninitialized, the logger&#39;s initializing (set_logger&#39;s been called but
 // LOGGER hasn&#39;t actually been set yet), or the logger&#39;s active.
 </span><span class="kw">const </span>UNINITIALIZED: usize = <span class="number">0</span>;
 <span class="kw">const </span>INITIALIZING: usize = <span class="number">1</span>;
 <span class="kw">const </span>INITIALIZED: usize = <span class="number">2</span>;

 <span class="kw">static </span>MAX_LOG_LEVEL_FILTER: AtomicUsize = AtomicUsize::new(<span class="number">0</span>);

 <span class="kw">static </span>LOG_LEVEL_NAMES: [<span class="kw-2">&amp;</span>str; <span class="number">6</span>] = [<span class="string">&quot;OFF&quot;</span>, <span class="string">&quot;ERROR&quot;</span>, <span class="string">&quot;WARN&quot;</span>, <span class="string">&quot;INFO&quot;</span>, <span class="string">&quot;DEBUG&quot;</span>, <span class="string">&quot;TRACE&quot;</span>];

 <span class="kw">static </span>SET_LOGGER_ERROR: <span class="kw-2">&amp;</span>str = <span class="string">&quot;attempted to set a logger after the logging system \
                                  was already initialized&quot;</span>;
 <span class="kw">static </span>LEVEL_PARSE_ERROR: <span class="kw-2">&amp;</span>str =
     <span class="string">&quot;attempted to convert a string that doesn&#39;t match an existing log level&quot;</span>;

 <span class="doccomment">/// An enum representing the available verbosity levels of the logger.
 ///
 /// Typical usage includes: checking if a certain `Level` is enabled with
 /// [`log_enabled!`](macro.log_enabled.html), specifying the `Level` of
 /// [`log!`](macro.log.html), and comparing a `Level` directly to a
 /// [`LevelFilter`](enum.LevelFilter.html).
 </span><span class="attribute">#[repr(usize)]
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
 </span><span class="kw">pub enum </span>Level {
     <span class="doccomment">/// The &quot;error&quot; level.
     ///
     /// Designates very serious errors.
     </span><span class="comment">// This way these line up with the discriminants for LevelFilter below
     // This works because Rust treats field-less enums the same way as C does:
     // https://doc.rust-lang.org/reference/items/enumerations.html#custom-discriminant-values-for-field-less-enumerations
     </span>Error = <span class="number">1</span>,
     <span class="doccomment">/// The &quot;warn&quot; level.
     ///
     /// Designates hazardous situations.
     </span>Warn,
     <span class="doccomment">/// The &quot;info&quot; level.
     ///
     /// Designates useful information.
     </span>Info,
     <span class="doccomment">/// The &quot;debug&quot; level.
     ///
     /// Designates lower priority information.
     </span>Debug,
     <span class="doccomment">/// The &quot;trace&quot; level.
     ///
     /// Designates very low priority, often extremely verbose, information.
     </span>Trace,
 }

 <span class="kw">impl </span>PartialEq&lt;LevelFilter&gt; <span class="kw">for </span>Level {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         <span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>usize == <span class="kw-2">*</span>other <span class="kw">as </span>usize
     }
 }

 <span class="kw">impl </span>PartialOrd&lt;LevelFilter&gt; <span class="kw">for </span>Level {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; <span class="prelude-ty">Option</span>&lt;cmp::Ordering&gt; {
         <span class="prelude-val">Some</span>((<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>usize).cmp(<span class="kw-2">&amp;</span>(<span class="kw-2">*</span>other <span class="kw">as </span>usize)))
     }
 }

 <span class="kw">fn </span>ok_or&lt;T, E&gt;(t: <span class="prelude-ty">Option</span>&lt;T&gt;, e: E) -&gt; <span class="prelude-ty">Result</span>&lt;T, E&gt; {
     <span class="kw">match </span>t {
         <span class="prelude-val">Some</span>(t) =&gt; <span class="prelude-val">Ok</span>(t),
         <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(e),
     }
 }

 <span class="kw">impl </span>FromStr <span class="kw">for </span>Level {
     <span class="kw">type </span><span class="prelude-val">Err </span>= ParseLevelError;
     <span class="kw">fn </span>from_str(level: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;Level, <span class="self">Self</span>::Err&gt; {
         ok_or(
             LOG_LEVEL_NAMES
                 .iter()
                 .position(|<span class="kw-2">&amp;</span>name| name.eq_ignore_ascii_case(level))
                 .into_iter()
                 .filter(|<span class="kw-2">&amp;</span>idx| idx != <span class="number">0</span>)
                 .map(|idx| Level::from_usize(idx).unwrap())
                 .next(),
             ParseLevelError(()),
         )
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Level {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         fmt.pad(<span class="self">self</span>.as_str())
     }
 }

 <span class="kw">impl </span>Level {
     <span class="kw">fn </span>from_usize(u: usize) -&gt; <span class="prelude-ty">Option</span>&lt;Level&gt; {
         <span class="kw">match </span>u {
             <span class="number">1 </span>=&gt; <span class="prelude-val">Some</span>(Level::Error),
             <span class="number">2 </span>=&gt; <span class="prelude-val">Some</span>(Level::Warn),
             <span class="number">3 </span>=&gt; <span class="prelude-val">Some</span>(Level::Info),
             <span class="number">4 </span>=&gt; <span class="prelude-val">Some</span>(Level::Debug),
             <span class="number">5 </span>=&gt; <span class="prelude-val">Some</span>(Level::Trace),
             <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Returns the most verbose logging level.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>max() -&gt; Level {
         Level::Trace
     }

     <span class="doccomment">/// Converts the `Level` to the equivalent `LevelFilter`.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>to_level_filter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; LevelFilter {
         LevelFilter::from_usize(<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>usize).unwrap()
     }

     <span class="doccomment">/// Returns the string representation of the `Level`.
     ///
     /// This returns the same string as the `fmt::Display` implementation.
     </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
         LOG_LEVEL_NAMES[<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>usize]
     }

     <span class="doccomment">/// Iterate through all supported logging levels.
     ///
     /// The order of iteration is from more severe to less severe log messages.
     ///
     /// # Examples
     ///
     /// ```
     /// use log::Level;
     ///
     /// let mut levels = Level::iter();
     ///
     /// assert_eq!(Some(Level::Error), levels.next());
     /// assert_eq!(Some(Level::Trace), levels.last());
     /// ```
     </span><span class="kw">pub fn </span>iter() -&gt; <span class="kw">impl </span>Iterator&lt;Item = <span class="self">Self</span>&gt; {
         (<span class="number">1</span>..<span class="number">6</span>).map(|i| <span class="self">Self</span>::from_usize(i).unwrap())
     }
 }

 <span class="doccomment">/// An enum representing the available verbosity level filters of the logger.
 ///
 /// A `LevelFilter` may be compared directly to a [`Level`]. Use this type
 /// to get and set the maximum log level with [`max_level()`] and [`set_max_level`].
 ///
 /// [`Level`]: enum.Level.html
 /// [`max_level()`]: fn.max_level.html
 /// [`set_max_level`]: fn.set_max_level.html
 </span><span class="attribute">#[repr(usize)]
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
 </span><span class="kw">pub enum </span>LevelFilter {
     <span class="doccomment">/// A level lower than all log levels.
     </span>Off,
     <span class="doccomment">/// Corresponds to the `Error` log level.
     </span>Error,
     <span class="doccomment">/// Corresponds to the `Warn` log level.
     </span>Warn,
     <span class="doccomment">/// Corresponds to the `Info` log level.
     </span>Info,
     <span class="doccomment">/// Corresponds to the `Debug` log level.
     </span>Debug,
     <span class="doccomment">/// Corresponds to the `Trace` log level.
     </span>Trace,
 }

 <span class="kw">impl </span>PartialEq&lt;Level&gt; <span class="kw">for </span>LevelFilter {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         other.eq(<span class="self">self</span>)
     }
 }

 <span class="kw">impl </span>PartialOrd&lt;Level&gt; <span class="kw">for </span>LevelFilter {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; <span class="prelude-ty">Option</span>&lt;cmp::Ordering&gt; {
         <span class="prelude-val">Some</span>((<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>usize).cmp(<span class="kw-2">&amp;</span>(<span class="kw-2">*</span>other <span class="kw">as </span>usize)))
     }
 }

 <span class="kw">impl </span>FromStr <span class="kw">for </span>LevelFilter {
     <span class="kw">type </span><span class="prelude-val">Err </span>= ParseLevelError;
     <span class="kw">fn </span>from_str(level: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;LevelFilter, <span class="self">Self</span>::Err&gt; {
         ok_or(
             LOG_LEVEL_NAMES
                 .iter()
                 .position(|<span class="kw-2">&amp;</span>name| name.eq_ignore_ascii_case(level))
                 .map(|p| LevelFilter::from_usize(p).unwrap()),
             ParseLevelError(()),
         )
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>LevelFilter {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         fmt.pad(<span class="self">self</span>.as_str())
     }
 }

 <span class="kw">impl </span>LevelFilter {
     <span class="kw">fn </span>from_usize(u: usize) -&gt; <span class="prelude-ty">Option</span>&lt;LevelFilter&gt; {
         <span class="kw">match </span>u {
             <span class="number">0 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::Off),
             <span class="number">1 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::Error),
             <span class="number">2 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::Warn),
             <span class="number">3 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::Info),
             <span class="number">4 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::Debug),
             <span class="number">5 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::Trace),
             <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Returns the most verbose logging level filter.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>max() -&gt; LevelFilter {
         LevelFilter::Trace
     }

     <span class="doccomment">/// Converts `self` to the equivalent `Level`.
     ///
     /// Returns `None` if `self` is `LevelFilter::Off`.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>to_level(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Level&gt; {
         Level::from_usize(<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>usize)
     }

     <span class="doccomment">/// Returns the string representation of the `LevelFilter`.
     ///
     /// This returns the same string as the `fmt::Display` implementation.
     </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
         LOG_LEVEL_NAMES[<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>usize]
     }

     <span class="doccomment">/// Iterate through all supported filtering levels.
     ///
     /// The order of iteration is from less to more verbose filtering.
     ///
     /// # Examples
     ///
     /// ```
     /// use log::LevelFilter;
     ///
     /// let mut levels = LevelFilter::iter();
     ///
     /// assert_eq!(Some(LevelFilter::Off), levels.next());
     /// assert_eq!(Some(LevelFilter::Trace), levels.last());
     /// ```
     </span><span class="kw">pub fn </span>iter() -&gt; <span class="kw">impl </span>Iterator&lt;Item = <span class="self">Self</span>&gt; {
         (<span class="number">0</span>..<span class="number">6</span>).map(|i| <span class="self">Self</span>::from_usize(i).unwrap())
     }
 }

 <span class="attribute">#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
 </span><span class="kw">enum </span>MaybeStaticStr&lt;<span class="lifetime">&#39;a</span>&gt; {
     Static(<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str),
     Borrowed(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str),
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; MaybeStaticStr&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>get(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             MaybeStaticStr::Static(s) =&gt; s,
             MaybeStaticStr::Borrowed(s) =&gt; s,
         }
     }
 }

 <span class="doccomment">/// The &quot;payload&quot; of a log message.
 ///
 /// # Use
 ///
 /// `Record` structures are passed as parameters to the [`log`][method.log]
 /// method of the [`Log`] trait. Logger implementors manipulate these
 /// structures in order to display log messages. `Record`s are automatically
 /// created by the [`log!`] macro and so are not seen by log users.
 ///
 /// Note that the [`level()`] and [`target()`] accessors are equivalent to
 /// `self.metadata().level()` and `self.metadata().target()` respectively.
 /// These methods are provided as a convenience for users of this structure.
 ///
 /// # Example
 ///
 /// The following example shows a simple logger that displays the level,
 /// module path, and message of any `Record` that is passed to it.
 ///
 /// ```edition2018
 /// struct SimpleLogger;
 ///
 /// impl log::Log for SimpleLogger {
 ///    fn enabled(&amp;self, _metadata: &amp;log::Metadata) -&gt; bool {
 ///        true
 ///    }
 ///
 ///    fn log(&amp;self, record: &amp;log::Record) {
 ///        if !self.enabled(record.metadata()) {
 ///            return;
 ///        }
 ///
 ///        println!(&quot;{}:{} -- {}&quot;,
 ///                 record.level(),
 ///                 record.target(),
 ///                 record.args());
 ///    }
 ///    fn flush(&amp;self) {}
 /// }
 /// ```
 ///
 /// [method.log]: trait.Log.html#tymethod.log
 /// [`Log`]: trait.Log.html
 /// [`log!`]: macro.log.html
 /// [`level()`]: struct.Record.html#method.level
 /// [`target()`]: struct.Record.html#method.target
 </span><span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">pub struct </span>Record&lt;<span class="lifetime">&#39;a</span>&gt; {
     metadata: Metadata&lt;<span class="lifetime">&#39;a</span>&gt;,
     args: fmt::Arguments&lt;<span class="lifetime">&#39;a</span>&gt;,
     module_path: <span class="prelude-ty">Option</span>&lt;MaybeStaticStr&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
     file: <span class="prelude-ty">Option</span>&lt;MaybeStaticStr&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
     line: <span class="prelude-ty">Option</span>&lt;u32&gt;,
     <span class="attribute">#[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
     </span>key_values: KeyValues&lt;<span class="lifetime">&#39;a</span>&gt;,
 }

 <span class="comment">// This wrapper type is only needed so we can
 // `#[derive(Debug)]` on `Record`. It also
 // provides a useful `Debug` implementation for
 // the underlying `Source`.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
 #[derive(Clone)]
 </span><span class="kw">struct </span>KeyValues&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw">dyn </span>kv::Source);

 <span class="attribute">#[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; fmt::Debug <span class="kw">for </span>KeyValues&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="kw">let </span><span class="kw-2">mut </span>visitor = f.debug_map();
         <span class="self">self</span>.<span class="number">0</span>.visit(<span class="kw-2">&amp;mut </span>visitor).map_err(|<span class="kw">_</span>| fmt::Error)<span class="question-mark">?</span>;
         visitor.finish()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Record&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Returns a new builder.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>builder() -&gt; RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         RecordBuilder::new()
     }

     <span class="doccomment">/// The message body.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>args(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>fmt::Arguments&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="kw-2">&amp;</span><span class="self">self</span>.args
     }

     <span class="doccomment">/// Metadata about the log directive.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>metadata(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="kw-2">&amp;</span><span class="self">self</span>.metadata
     }

     <span class="doccomment">/// The verbosity level of the message.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>level(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Level {
         <span class="self">self</span>.metadata.level()
     }

     <span class="doccomment">/// The name of the target of the directive.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>target(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str {
         <span class="self">self</span>.metadata.target()
     }

     <span class="doccomment">/// The module path of the message.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>module_path(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt; {
         <span class="self">self</span>.module_path.map(|s| s.get())
     }

     <span class="doccomment">/// The module path of the message, if it is a `&#39;static` string.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>module_path_static(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str&gt; {
         <span class="kw">match </span><span class="self">self</span>.module_path {
             <span class="prelude-val">Some</span>(MaybeStaticStr::Static(s)) =&gt; <span class="prelude-val">Some</span>(s),
             <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// The source file containing the message.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>file(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt; {
         <span class="self">self</span>.file.map(|s| s.get())
     }

     <span class="doccomment">/// The module path of the message, if it is a `&#39;static` string.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>file_static(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str&gt; {
         <span class="kw">match </span><span class="self">self</span>.file {
             <span class="prelude-val">Some</span>(MaybeStaticStr::Static(s)) =&gt; <span class="prelude-val">Some</span>(s),
             <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// The line containing the message.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>line(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u32&gt; {
         <span class="self">self</span>.line
     }

     <span class="doccomment">/// The structured key-value pairs associated with the message.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
     #[inline]
     </span><span class="kw">pub fn </span>key_values(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="kw">dyn </span>kv::Source {
         <span class="self">self</span>.key_values.<span class="number">0
     </span>}

     <span class="doccomment">/// Create a new [`RecordBuilder`](struct.RecordBuilder.html) based on this record.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
     #[inline]
     </span><span class="kw">pub fn </span>to_builder(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; RecordBuilder {
         RecordBuilder {
             record: Record {
                 metadata: Metadata {
                     level: <span class="self">self</span>.metadata.level,
                     target: <span class="self">self</span>.metadata.target,
                 },
                 args: <span class="self">self</span>.args,
                 module_path: <span class="self">self</span>.module_path,
                 file: <span class="self">self</span>.file,
                 line: <span class="self">self</span>.line,
                 key_values: <span class="self">self</span>.key_values.clone(),
             },
         }
     }
 }

 <span class="doccomment">/// Builder for [`Record`](struct.Record.html).
 ///
 /// Typically should only be used by log library creators or for testing and &quot;shim loggers&quot;.
 /// The `RecordBuilder` can set the different parameters of `Record` object, and returns
 /// the created object when `build` is called.
 ///
 /// # Examples
 ///
 /// ```edition2018
 /// use log::{Level, Record};
 ///
 /// let record = Record::builder()
 ///                 .args(format_args!(&quot;Error!&quot;))
 ///                 .level(Level::Error)
 ///                 .target(&quot;myApp&quot;)
 ///                 .file(Some(&quot;server.rs&quot;))
 ///                 .line(Some(144))
 ///                 .module_path(Some(&quot;server&quot;))
 ///                 .build();
 /// ```
 ///
 /// Alternatively, use [`MetadataBuilder`](struct.MetadataBuilder.html):
 ///
 /// ```edition2018
 /// use log::{Record, Level, MetadataBuilder};
 ///
 /// let error_metadata = MetadataBuilder::new()
 ///                         .target(&quot;myApp&quot;)
 ///                         .level(Level::Error)
 ///                         .build();
 ///
 /// let record = Record::builder()
 ///                 .metadata(error_metadata)
 ///                 .args(format_args!(&quot;Error!&quot;))
 ///                 .line(Some(433))
 ///                 .file(Some(&quot;app.rs&quot;))
 ///                 .module_path(Some(&quot;server&quot;))
 ///                 .build();
 /// ```
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
     record: Record&lt;<span class="lifetime">&#39;a</span>&gt;,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Construct new `RecordBuilder`.
     ///
     /// The default options are:
     ///
     /// - `args`: [`format_args!(&quot;&quot;)`]
     /// - `metadata`: [`Metadata::builder().build()`]
     /// - `module_path`: `None`
     /// - `file`: `None`
     /// - `line`: `None`
     ///
     /// [`format_args!(&quot;&quot;)`]: https://doc.rust-lang.org/std/macro.format_args.html
     /// [`Metadata::builder().build()`]: struct.MetadataBuilder.html#method.build
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>new() -&gt; RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         RecordBuilder {
             record: Record {
                 args: <span class="macro">format_args!</span>(<span class="string">&quot;&quot;</span>),
                 metadata: Metadata::builder().build(),
                 module_path: <span class="prelude-val">None</span>,
                 file: <span class="prelude-val">None</span>,
                 line: <span class="prelude-val">None</span>,
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
                 </span>key_values: KeyValues(<span class="kw-2">&amp;</span>Option::None::&lt;(kv::Key, kv::Value)&gt;),
             },
         }
     }

     <span class="doccomment">/// Set [`args`](struct.Record.html#method.args).
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>args(<span class="kw-2">&amp;mut </span><span class="self">self</span>, args: fmt::Arguments&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.args = args;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`metadata`](struct.Record.html#method.metadata). Construct a `Metadata` object with [`MetadataBuilder`](struct.MetadataBuilder.html).
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>metadata(<span class="kw-2">&amp;mut </span><span class="self">self</span>, metadata: Metadata&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.metadata = metadata;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`Metadata::level`](struct.Metadata.html#method.level).
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>level(<span class="kw-2">&amp;mut </span><span class="self">self</span>, level: Level) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.metadata.level = level;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`Metadata::target`](struct.Metadata.html#method.target)
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>target(<span class="kw-2">&amp;mut </span><span class="self">self</span>, target: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.metadata.target = target;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`module_path`](struct.Record.html#method.module_path)
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>module_path(<span class="kw-2">&amp;mut </span><span class="self">self</span>, path: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt;) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.module_path = path.map(MaybeStaticStr::Borrowed);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`module_path`](struct.Record.html#method.module_path) to a `&#39;static` string
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>module_path_static(<span class="kw-2">&amp;mut </span><span class="self">self</span>, path: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str&gt;) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.module_path = path.map(MaybeStaticStr::Static);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`file`](struct.Record.html#method.file)
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>file(<span class="kw-2">&amp;mut </span><span class="self">self</span>, file: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt;) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.file = file.map(MaybeStaticStr::Borrowed);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`file`](struct.Record.html#method.file) to a `&#39;static` string.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>file_static(<span class="kw-2">&amp;mut </span><span class="self">self</span>, file: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str&gt;) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.file = file.map(MaybeStaticStr::Static);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`line`](struct.Record.html#method.line)
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>line(<span class="kw-2">&amp;mut </span><span class="self">self</span>, line: <span class="prelude-ty">Option</span>&lt;u32&gt;) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.line = line;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set [`key_values`](struct.Record.html#method.key_values)
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
     #[inline]
     </span><span class="kw">pub fn </span>key_values(<span class="kw-2">&amp;mut </span><span class="self">self</span>, kvs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw">dyn </span>kv::Source) -&gt; <span class="kw-2">&amp;mut </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.key_values = KeyValues(kvs);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Invoke the builder and return a `Record`
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Record&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.record.clone()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Default <span class="kw">for </span>RecordBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::new()
     }
 }

 <span class="doccomment">/// Metadata about a log message.
 ///
 /// # Use
 ///
 /// `Metadata` structs are created when users of the library use
 /// logging macros.
 ///
 /// They are consumed by implementations of the `Log` trait in the
 /// `enabled` method.
 ///
 /// `Record`s use `Metadata` to determine the log message&#39;s severity
 /// and target.
 ///
 /// Users should use the `log_enabled!` macro in their code to avoid
 /// constructing expensive log messages.
 ///
 /// # Examples
 ///
 /// ```edition2018
 /// use log::{Record, Level, Metadata};
 ///
 /// struct MyLogger;
 ///
 /// impl log::Log for MyLogger {
 ///     fn enabled(&amp;self, metadata: &amp;Metadata) -&gt; bool {
 ///         metadata.level() &lt;= Level::Info
 ///     }
 ///
 ///     fn log(&amp;self, record: &amp;Record) {
 ///         if self.enabled(record.metadata()) {
 ///             println!(&quot;{} - {}&quot;, record.level(), record.args());
 ///         }
 ///     }
 ///     fn flush(&amp;self) {}
 /// }
 ///
 /// # fn main(){}
 /// ```
 </span><span class="attribute">#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
 </span><span class="kw">pub struct </span>Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {
     level: Level,
     target: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Returns a new builder.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>builder() -&gt; MetadataBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         MetadataBuilder::new()
     }

     <span class="doccomment">/// The verbosity level of the message.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>level(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Level {
         <span class="self">self</span>.level
     }

     <span class="doccomment">/// The name of the target of the directive.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>target(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str {
         <span class="self">self</span>.target
     }
 }

 <span class="doccomment">/// Builder for [`Metadata`](struct.Metadata.html).
 ///
 /// Typically should only be used by log library creators or for testing and &quot;shim loggers&quot;.
 /// The `MetadataBuilder` can set the different parameters of a `Metadata` object, and returns
 /// the created object when `build` is called.
 ///
 /// # Example
 ///
 /// ```edition2018
 /// let target = &quot;myApp&quot;;
 /// use log::{Level, MetadataBuilder};
 /// let metadata = MetadataBuilder::new()
 ///                     .level(Level::Debug)
 ///                     .target(target)
 ///                     .build();
 /// ```
 </span><span class="attribute">#[derive(Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
 </span><span class="kw">pub struct </span>MetadataBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
     metadata: Metadata&lt;<span class="lifetime">&#39;a</span>&gt;,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; MetadataBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Construct a new `MetadataBuilder`.
     ///
     /// The default options are:
     ///
     /// - `level`: `Level::Info`
     /// - `target`: `&quot;&quot;`
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>new() -&gt; MetadataBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         MetadataBuilder {
             metadata: Metadata {
                 level: Level::Info,
                 target: <span class="string">&quot;&quot;</span>,
             },
         }
     }

     <span class="doccomment">/// Setter for [`level`](struct.Metadata.html#method.level).
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>level(<span class="kw-2">&amp;mut </span><span class="self">self</span>, arg: Level) -&gt; <span class="kw-2">&amp;mut </span>MetadataBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.metadata.level = arg;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Setter for [`target`](struct.Metadata.html#method.target).
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>target(<span class="kw-2">&amp;mut </span><span class="self">self</span>, target: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; <span class="kw-2">&amp;mut </span>MetadataBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.metadata.target = target;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Returns a `Metadata` object.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {
         <span class="self">self</span>.metadata.clone()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Default <span class="kw">for </span>MetadataBuilder&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::new()
     }
 }

 <span class="doccomment">/// A trait encapsulating the operations required of a logger.
 </span><span class="kw">pub trait </span>Log: Sync + Send {
     <span class="doccomment">/// Determines if a log message with the specified metadata would be
     /// logged.
     ///
     /// This is used by the `log_enabled!` macro to allow callers to avoid
     /// expensive computation of log message arguments if the message would be
     /// discarded anyway.
     ///
     /// # For implementors
     ///
     /// This method isn&#39;t called automatically by the `log!` macros.
     /// It&#39;s up to an implementation of the `Log` trait to call `enabled` in its own
     /// `log` method implementation to guarantee that filtering is applied.
     </span><span class="kw">fn </span>enabled(<span class="kw-2">&amp;</span><span class="self">self</span>, metadata: <span class="kw-2">&amp;</span>Metadata) -&gt; bool;

     <span class="doccomment">/// Logs the `Record`.
     ///
     /// # For implementors
     ///
     /// Note that `enabled` is *not* necessarily called before this method.
     /// Implementations of `log` should perform all necessary filtering
     /// internally.
     </span><span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, record: <span class="kw-2">&amp;</span>Record);

     <span class="doccomment">/// Flushes any buffered records.
     </span><span class="kw">fn </span>flush(<span class="kw-2">&amp;</span><span class="self">self</span>);
 }

 <span class="comment">// Just used as a dummy initial value for LOGGER
 </span><span class="kw">struct </span>NopLogger;

 <span class="kw">impl </span>Log <span class="kw">for </span>NopLogger {
     <span class="kw">fn </span>enabled(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span>Metadata) -&gt; bool {
         <span class="bool-val">false
     </span>}

     <span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span>Record) {}
     <span class="kw">fn </span>flush(<span class="kw-2">&amp;</span><span class="self">self</span>) {}
 }

 <span class="kw">impl</span>&lt;T&gt; Log <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;_ </span>T
 <span class="kw">where
     </span>T: <span class="question-mark">?</span>Sized + Log,
 {
     <span class="kw">fn </span>enabled(<span class="kw-2">&amp;</span><span class="self">self</span>, metadata: <span class="kw-2">&amp;</span>Metadata) -&gt; bool {
         (<span class="kw-2">**</span><span class="self">self</span>).enabled(metadata)
     }

     <span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, record: <span class="kw-2">&amp;</span>Record) {
         (<span class="kw-2">**</span><span class="self">self</span>).log(record);
     }
     <span class="kw">fn </span>flush(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         (<span class="kw-2">**</span><span class="self">self</span>).flush();
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">impl</span>&lt;T&gt; Log <span class="kw">for </span>std::boxed::Box&lt;T&gt;
 <span class="kw">where
     </span>T: <span class="question-mark">?</span>Sized + Log,
 {
     <span class="kw">fn </span>enabled(<span class="kw-2">&amp;</span><span class="self">self</span>, metadata: <span class="kw-2">&amp;</span>Metadata) -&gt; bool {
         <span class="self">self</span>.as_ref().enabled(metadata)
     }

     <span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, record: <span class="kw-2">&amp;</span>Record) {
         <span class="self">self</span>.as_ref().log(record)
     }
     <span class="kw">fn </span>flush(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="self">self</span>.as_ref().flush()
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">impl</span>&lt;T&gt; Log <span class="kw">for </span>std::sync::Arc&lt;T&gt;
 <span class="kw">where
     </span>T: <span class="question-mark">?</span>Sized + Log,
 {
     <span class="kw">fn </span>enabled(<span class="kw-2">&amp;</span><span class="self">self</span>, metadata: <span class="kw-2">&amp;</span>Metadata) -&gt; bool {
         <span class="self">self</span>.as_ref().enabled(metadata)
     }

     <span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, record: <span class="kw-2">&amp;</span>Record) {
         <span class="self">self</span>.as_ref().log(record)
     }
     <span class="kw">fn </span>flush(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="self">self</span>.as_ref().flush()
     }
 }

 <span class="doccomment">/// Sets the global maximum log level.
 ///
 /// Generally, this should only be called by the active logging implementation.
 ///
 /// Note that `Trace` is the maximum level, because it provides the maximum amount of detail in the emitted logs.
 </span><span class="attribute">#[inline]
 </span><span class="kw">pub fn </span>set_max_level(level: LevelFilter) {
     MAX_LOG_LEVEL_FILTER.store(level <span class="kw">as </span>usize, Ordering::Relaxed);
 }

 <span class="doccomment">/// A thread-unsafe version of [`set_max_level`].
 ///
 /// This function is available on all platforms, even those that do not have
 /// support for atomics that is needed by [`set_max_level`].
 ///
 /// In almost all cases, [`set_max_level`] should be preferred.
 ///
 /// # Safety
 ///
 /// This function is only safe to call when no other level setting function is
 /// called while this function still executes.
 ///
 /// This can be upheld by (for example) making sure that **there are no other
 /// threads**, and (on embedded) that **interrupts are disabled**.
 ///
 /// Is is safe to use all other logging functions while this function runs
 /// (including all logging macros).
 ///
 /// [`set_max_level`]: fn.set_max_level.html
 </span><span class="attribute">#[inline]
 </span><span class="kw">pub unsafe fn </span>set_max_level_racy(level: LevelFilter) {
     <span class="comment">// `MAX_LOG_LEVEL_FILTER` uses a `Cell` as the underlying primitive when a
     // platform doesn&#39;t support `target_has_atomic = &quot;ptr&quot;`, so even though this looks the same
     // as `set_max_level` it may have different safety properties.
     </span>MAX_LOG_LEVEL_FILTER.store(level <span class="kw">as </span>usize, Ordering::Relaxed);
 }

 <span class="doccomment">/// Returns the current maximum log level.
 ///
 /// The [`log!`], [`error!`], [`warn!`], [`info!`], [`debug!`], and [`trace!`] macros check
 /// this value and discard any message logged at a higher level. The maximum
 /// log level is set by the [`set_max_level`] function.
 ///
 /// [`log!`]: macro.log.html
 /// [`error!`]: macro.error.html
 /// [`warn!`]: macro.warn.html
 /// [`info!`]: macro.info.html
 /// [`debug!`]: macro.debug.html
 /// [`trace!`]: macro.trace.html
 /// [`set_max_level`]: fn.set_max_level.html
 </span><span class="attribute">#[inline(always)]
 </span><span class="kw">pub fn </span>max_level() -&gt; LevelFilter {
     <span class="comment">// Since `LevelFilter` is `repr(usize)`,
     // this transmute is sound if and only if `MAX_LOG_LEVEL_FILTER`
     // is set to a usize that is a valid discriminant for `LevelFilter`.
     // Since `MAX_LOG_LEVEL_FILTER` is private, the only time it&#39;s set
     // is by `set_max_level` above, i.e. by casting a `LevelFilter` to `usize`.
     // So any usize stored in `MAX_LOG_LEVEL_FILTER` is a valid discriminant.
     </span><span class="kw">unsafe </span>{ mem::transmute(MAX_LOG_LEVEL_FILTER.load(Ordering::Relaxed)) }
 }

 <span class="doccomment">/// Sets the global logger to a `Box&lt;Log&gt;`.
 ///
 /// This is a simple convenience wrapper over `set_logger`, which takes a
 /// `Box&lt;Log&gt;` rather than a `&amp;&#39;static Log`. See the documentation for
 /// [`set_logger`] for more details.
 ///
 /// Requires the `std` feature.
 ///
 /// # Errors
 ///
 /// An error is returned if a logger has already been set.
 ///
 /// [`set_logger`]: fn.set_logger.html
 </span><span class="attribute">#[cfg(all(feature = <span class="string">&quot;std&quot;</span>, atomic_cas))]
 </span><span class="kw">pub fn </span>set_boxed_logger(logger: Box&lt;<span class="kw">dyn </span>Log&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;(), SetLoggerError&gt; {
     set_logger_inner(|| Box::leak(logger))
 }

 <span class="doccomment">/// Sets the global logger to a `&amp;&#39;static Log`.
 ///
 /// This function may only be called once in the lifetime of a program. Any log
 /// events that occur before the call to `set_logger` completes will be ignored.
 ///
 /// This function does not typically need to be called manually. Logger
 /// implementations should provide an initialization method that installs the
 /// logger internally.
 ///
 /// # Availability
 ///
 /// This method is available even when the `std` feature is disabled. However,
 /// it is currently unavailable on `thumbv6` targets, which lack support for
 /// some atomic operations which are used by this function. Even on those
 /// targets, [`set_logger_racy`] will be available.
 ///
 /// # Errors
 ///
 /// An error is returned if a logger has already been set.
 ///
 /// # Examples
 ///
 /// ```edition2018
 /// use log::{error, info, warn, Record, Level, Metadata, LevelFilter};
 ///
 /// static MY_LOGGER: MyLogger = MyLogger;
 ///
 /// struct MyLogger;
 ///
 /// impl log::Log for MyLogger {
 ///     fn enabled(&amp;self, metadata: &amp;Metadata) -&gt; bool {
 ///         metadata.level() &lt;= Level::Info
 ///     }
 ///
 ///     fn log(&amp;self, record: &amp;Record) {
 ///         if self.enabled(record.metadata()) {
 ///             println!(&quot;{} - {}&quot;, record.level(), record.args());
 ///         }
 ///     }
 ///     fn flush(&amp;self) {}
 /// }
 ///
 /// # fn main(){
 /// log::set_logger(&amp;MY_LOGGER).unwrap();
 /// log::set_max_level(LevelFilter::Info);
 ///
 /// info!(&quot;hello log&quot;);
 /// warn!(&quot;warning&quot;);
 /// error!(&quot;oops&quot;);
 /// # }
 /// ```
 ///
 /// [`set_logger_racy`]: fn.set_logger_racy.html
 </span><span class="attribute">#[cfg(atomic_cas)]
 </span><span class="kw">pub fn </span>set_logger(logger: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span><span class="kw">dyn </span>Log) -&gt; <span class="prelude-ty">Result</span>&lt;(), SetLoggerError&gt; {
     set_logger_inner(|| logger)
 }

 <span class="attribute">#[cfg(atomic_cas)]
 </span><span class="kw">fn </span>set_logger_inner&lt;F&gt;(make_logger: F) -&gt; <span class="prelude-ty">Result</span>&lt;(), SetLoggerError&gt;
 <span class="kw">where
     </span>F: FnOnce() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span><span class="kw">dyn </span>Log,
 {
     <span class="kw">let </span>old_state = <span class="kw">match </span>STATE.compare_exchange(
         UNINITIALIZED,
         INITIALIZING,
         Ordering::SeqCst,
         Ordering::SeqCst,
     ) {
         <span class="prelude-val">Ok</span>(s) | <span class="prelude-val">Err</span>(s) =&gt; s,
     };
     <span class="kw">match </span>old_state {
         UNINITIALIZED =&gt; {
             <span class="kw">unsafe </span>{
                 LOGGER = make_logger();
             }
             STATE.store(INITIALIZED, Ordering::SeqCst);
             <span class="prelude-val">Ok</span>(())
         }
         INITIALIZING =&gt; {
             <span class="kw">while </span>STATE.load(Ordering::SeqCst) == INITIALIZING {
                 <span class="comment">// TODO: replace with `hint::spin_loop` once MSRV is 1.49.0.
                 </span><span class="attribute">#[allow(deprecated)]
                 </span>std::sync::atomic::spin_loop_hint();
             }
             <span class="prelude-val">Err</span>(SetLoggerError(()))
         }
         <span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(SetLoggerError(())),
     }
 }

 <span class="doccomment">/// A thread-unsafe version of [`set_logger`].
 ///
 /// This function is available on all platforms, even those that do not have
 /// support for atomics that is needed by [`set_logger`].
 ///
 /// In almost all cases, [`set_logger`] should be preferred.
 ///
 /// # Safety
 ///
 /// This function is only safe to call when no other logger initialization
 /// function is called while this function still executes.
 ///
 /// This can be upheld by (for example) making sure that **there are no other
 /// threads**, and (on embedded) that **interrupts are disabled**.
 ///
 /// It is safe to use other logging functions while this function runs
 /// (including all logging macros).
 ///
 /// [`set_logger`]: fn.set_logger.html
 </span><span class="kw">pub unsafe fn </span>set_logger_racy(logger: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span><span class="kw">dyn </span>Log) -&gt; <span class="prelude-ty">Result</span>&lt;(), SetLoggerError&gt; {
     <span class="kw">match </span>STATE.load(Ordering::SeqCst) {
         UNINITIALIZED =&gt; {
             LOGGER = logger;
             STATE.store(INITIALIZED, Ordering::SeqCst);
             <span class="prelude-val">Ok</span>(())
         }
         INITIALIZING =&gt; {
             <span class="comment">// This is just plain UB, since we were racing another initialization function
             </span><span class="macro">unreachable!</span>(<span class="string">&quot;set_logger_racy must not be used with other initialization functions&quot;</span>)
         }
         <span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(SetLoggerError(())),
     }
 }

 <span class="doccomment">/// The type returned by [`set_logger`] if [`set_logger`] has already been called.
 ///
 /// [`set_logger`]: fn.set_logger.html
 </span><span class="attribute">#[allow(missing_copy_implementations)]
 #[derive(Debug)]
 </span><span class="kw">pub struct </span>SetLoggerError(());

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>SetLoggerError {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         fmt.write_str(SET_LOGGER_ERROR)
     }
 }

 <span class="comment">// The Error trait is not available in libcore
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">impl </span>error::Error <span class="kw">for </span>SetLoggerError {}

 <span class="doccomment">/// The type returned by [`from_str`] when the string doesn&#39;t match any of the log levels.
 ///
 /// [`from_str`]: https://doc.rust-lang.org/std/str/trait.FromStr.html#tymethod.from_str
 </span><span class="attribute">#[allow(missing_copy_implementations)]
 #[derive(Debug, PartialEq, Eq)]
 </span><span class="kw">pub struct </span>ParseLevelError(());

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>ParseLevelError {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         fmt.write_str(LEVEL_PARSE_ERROR)
     }
 }

 <span class="comment">// The Error trait is not available in libcore
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">impl </span>error::Error <span class="kw">for </span>ParseLevelError {}

 <span class="doccomment">/// Returns a reference to the logger.
 ///
 /// If a logger has not been set, a no-op implementation is returned.
 </span><span class="kw">pub fn </span>logger() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span><span class="kw">dyn </span>Log {
     <span class="kw">if </span>STATE.load(Ordering::SeqCst) != INITIALIZED {
         <span class="kw">static </span>NOP: NopLogger = NopLogger;
         <span class="kw-2">&amp;</span>NOP
     } <span class="kw">else </span>{
         <span class="kw">unsafe </span>{ LOGGER }
     }
 }

 <span class="comment">// WARNING: this is not part of the crate&#39;s public API and is subject to change at any time
 </span><span class="attribute">#[doc(hidden)]
 #[cfg(not(feature = <span class="string">&quot;kv_unstable&quot;</span>))]
 </span><span class="kw">pub fn </span>__private_api_log(
     args: fmt::Arguments,
     level: Level,
     <span class="kw-2">&amp;</span>(target, module_path, file, line): <span class="kw-2">&amp;</span>(<span class="kw-2">&amp;</span>str, <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str, <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str, u32),
     kvs: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>[(<span class="kw-2">&amp;</span>str, <span class="kw-2">&amp;</span>str)]&gt;,
 ) {
     <span class="kw">if </span>kvs.is_some() {
         <span class="macro">panic!</span>(
             <span class="string">&quot;key-value support is experimental and must be enabled using the `kv_unstable` feature&quot;
         </span>)
     }

     logger().log(
         <span class="kw-2">&amp;</span>Record::builder()
             .args(args)
             .level(level)
             .target(target)
             .module_path_static(<span class="prelude-val">Some</span>(module_path))
             .file_static(<span class="prelude-val">Some</span>(file))
             .line(<span class="prelude-val">Some</span>(line))
             .build(),
     );
 }

 <span class="comment">// WARNING: this is not part of the crate&#39;s public API and is subject to change at any time
 </span><span class="attribute">#[doc(hidden)]
 #[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
 </span><span class="kw">pub fn </span>__private_api_log(
     args: fmt::Arguments,
     level: Level,
     <span class="kw-2">&amp;</span>(target, module_path, file, line): <span class="kw-2">&amp;</span>(<span class="kw-2">&amp;</span>str, <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str, <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str, u32),
     kvs: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>[(<span class="kw-2">&amp;</span>str, <span class="kw-2">&amp;</span><span class="kw">dyn </span>kv::ToValue)]&gt;,
 ) {
     logger().log(
         <span class="kw-2">&amp;</span>Record::builder()
             .args(args)
             .level(level)
             .target(target)
             .module_path_static(<span class="prelude-val">Some</span>(module_path))
             .file_static(<span class="prelude-val">Some</span>(file))
             .line(<span class="prelude-val">Some</span>(line))
             .key_values(<span class="kw-2">&amp;</span>kvs)
             .build(),
     );
 }

 <span class="comment">// WARNING: this is not part of the crate&#39;s public API and is subject to change at any time
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub fn </span>__private_api_enabled(level: Level, target: <span class="kw-2">&amp;</span>str) -&gt; bool {
     logger().enabled(<span class="kw-2">&amp;</span>Metadata::builder().level(level).target(target).build())
 }

 <span class="comment">// WARNING: this is not part of the crate&#39;s public API and is subject to change at any time
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub mod </span>__private_api {
     <span class="kw">pub use </span>std::option::Option;
 }

 <span class="doccomment">/// The statically resolved maximum log level.
 ///
 /// See the crate level documentation for information on how to configure this.
 ///
 /// This value is checked by the log macros, but not by the `Log`ger returned by
 /// the [`logger`] function. Code that manually calls functions on that value
 /// should compare the level against this value.
 ///
 /// [`logger`]: fn.logger.html
 </span><span class="kw">pub const </span>STATIC_MAX_LEVEL: LevelFilter = MAX_LEVEL_INNER;

 <span class="kw">const </span>MAX_LEVEL_INNER: LevelFilter = get_max_level_inner();

 <span class="kw">const fn </span>get_max_level_inner() -&gt; LevelFilter {
     <span class="attribute">#[allow(unreachable_code)]
     </span>{
         <span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">&quot;release_max_level_off&quot;</span>))]
         </span>{
             <span class="kw">return </span>LevelFilter::Off;
         }
         <span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">&quot;release_max_level_error&quot;</span>))]
         </span>{
             <span class="kw">return </span>LevelFilter::Error;
         }
         <span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">&quot;release_max_level_warn&quot;</span>))]
         </span>{
             <span class="kw">return </span>LevelFilter::Warn;
         }
         <span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">&quot;release_max_level_info&quot;</span>))]
         </span>{
             <span class="kw">return </span>LevelFilter::Info;
         }
         <span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">&quot;release_max_level_debug&quot;</span>))]
         </span>{
             <span class="kw">return </span>LevelFilter::Debug;
         }
         <span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">&quot;release_max_level_trace&quot;</span>))]
         </span>{
             <span class="kw">return </span>LevelFilter::Trace;
         }
         <span class="attribute">#[cfg(feature = <span class="string">&quot;max_level_off&quot;</span>)]
         </span>{
             <span class="kw">return </span>LevelFilter::Off;
         }
         <span class="attribute">#[cfg(feature = <span class="string">&quot;max_level_error&quot;</span>)]
         </span>{
             <span class="kw">return </span>LevelFilter::Error;
         }
         <span class="attribute">#[cfg(feature = <span class="string">&quot;max_level_warn&quot;</span>)]
         </span>{
             <span class="kw">return </span>LevelFilter::Warn;
         }
         <span class="attribute">#[cfg(feature = <span class="string">&quot;max_level_info&quot;</span>)]
         </span>{
             <span class="kw">return </span>LevelFilter::Info;
         }
         <span class="attribute">#[cfg(feature = <span class="string">&quot;max_level_debug&quot;</span>)]
         </span>{
             <span class="kw">return </span>LevelFilter::Debug;
         }

         LevelFilter::Trace
     }
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">extern crate </span>std;
     <span class="kw">use super</span>::{Level, LevelFilter, ParseLevelError};
     <span class="kw">use </span>tests::std::string::ToString;

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_levelfilter_from_str() {
         <span class="kw">let </span>tests = [
             (<span class="string">&quot;off&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Off)),
             (<span class="string">&quot;error&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Error)),
             (<span class="string">&quot;warn&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Warn)),
             (<span class="string">&quot;info&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Info)),
             (<span class="string">&quot;debug&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Debug)),
             (<span class="string">&quot;trace&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Trace)),
             (<span class="string">&quot;OFF&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Off)),
             (<span class="string">&quot;ERROR&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Error)),
             (<span class="string">&quot;WARN&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Warn)),
             (<span class="string">&quot;INFO&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Info)),
             (<span class="string">&quot;DEBUG&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Debug)),
             (<span class="string">&quot;TRACE&quot;</span>, <span class="prelude-val">Ok</span>(LevelFilter::Trace)),
             (<span class="string">&quot;asdf&quot;</span>, <span class="prelude-val">Err</span>(ParseLevelError(()))),
         ];
         <span class="kw">for </span><span class="kw-2">&amp;</span>(s, <span class="kw-2">ref </span>expected) <span class="kw">in </span><span class="kw-2">&amp;</span>tests {
             <span class="macro">assert_eq!</span>(expected, <span class="kw-2">&amp;</span>s.parse());
         }
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_level_from_str() {
         <span class="kw">let </span>tests = [
             (<span class="string">&quot;OFF&quot;</span>, <span class="prelude-val">Err</span>(ParseLevelError(()))),
             (<span class="string">&quot;error&quot;</span>, <span class="prelude-val">Ok</span>(Level::Error)),
             (<span class="string">&quot;warn&quot;</span>, <span class="prelude-val">Ok</span>(Level::Warn)),
             (<span class="string">&quot;info&quot;</span>, <span class="prelude-val">Ok</span>(Level::Info)),
             (<span class="string">&quot;debug&quot;</span>, <span class="prelude-val">Ok</span>(Level::Debug)),
             (<span class="string">&quot;trace&quot;</span>, <span class="prelude-val">Ok</span>(Level::Trace)),
             (<span class="string">&quot;ERROR&quot;</span>, <span class="prelude-val">Ok</span>(Level::Error)),
             (<span class="string">&quot;WARN&quot;</span>, <span class="prelude-val">Ok</span>(Level::Warn)),
             (<span class="string">&quot;INFO&quot;</span>, <span class="prelude-val">Ok</span>(Level::Info)),
             (<span class="string">&quot;DEBUG&quot;</span>, <span class="prelude-val">Ok</span>(Level::Debug)),
             (<span class="string">&quot;TRACE&quot;</span>, <span class="prelude-val">Ok</span>(Level::Trace)),
             (<span class="string">&quot;asdf&quot;</span>, <span class="prelude-val">Err</span>(ParseLevelError(()))),
         ];
         <span class="kw">for </span><span class="kw-2">&amp;</span>(s, <span class="kw-2">ref </span>expected) <span class="kw">in </span><span class="kw-2">&amp;</span>tests {
             <span class="macro">assert_eq!</span>(expected, <span class="kw-2">&amp;</span>s.parse());
         }
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_level_as_str() {
         <span class="kw">let </span>tests = <span class="kw-2">&amp;</span>[
             (Level::Error, <span class="string">&quot;ERROR&quot;</span>),
             (Level::Warn, <span class="string">&quot;WARN&quot;</span>),
             (Level::Info, <span class="string">&quot;INFO&quot;</span>),
             (Level::Debug, <span class="string">&quot;DEBUG&quot;</span>),
             (Level::Trace, <span class="string">&quot;TRACE&quot;</span>),
         ];
         <span class="kw">for </span>(input, expected) <span class="kw">in </span>tests {
             <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>expected, input.as_str());
         }
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_level_show() {
         <span class="macro">assert_eq!</span>(<span class="string">&quot;INFO&quot;</span>, Level::Info.to_string());
         <span class="macro">assert_eq!</span>(<span class="string">&quot;ERROR&quot;</span>, Level::Error.to_string());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_levelfilter_show() {
         <span class="macro">assert_eq!</span>(<span class="string">&quot;OFF&quot;</span>, LevelFilter::Off.to_string());
         <span class="macro">assert_eq!</span>(<span class="string">&quot;ERROR&quot;</span>, LevelFilter::Error.to_string());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_cross_cmp() {
         <span class="macro">assert!</span>(Level::Debug &gt; LevelFilter::Error);
         <span class="macro">assert!</span>(LevelFilter::Warn &lt; Level::Trace);
         <span class="macro">assert!</span>(LevelFilter::Off &lt; Level::Error);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_cross_eq() {
         <span class="macro">assert!</span>(Level::Error == LevelFilter::Error);
         <span class="macro">assert!</span>(LevelFilter::Off != Level::Error);
         <span class="macro">assert!</span>(Level::Trace == LevelFilter::Trace);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_to_level() {
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(Level::Error), LevelFilter::Error.to_level());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, LevelFilter::Off.to_level());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(Level::Debug), LevelFilter::Debug.to_level());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_to_level_filter() {
         <span class="macro">assert_eq!</span>(LevelFilter::Error, Level::Error.to_level_filter());
         <span class="macro">assert_eq!</span>(LevelFilter::Trace, Level::Trace.to_level_filter());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_level_filter_as_str() {
         <span class="kw">let </span>tests = <span class="kw-2">&amp;</span>[
             (LevelFilter::Off, <span class="string">&quot;OFF&quot;</span>),
             (LevelFilter::Error, <span class="string">&quot;ERROR&quot;</span>),
             (LevelFilter::Warn, <span class="string">&quot;WARN&quot;</span>),
             (LevelFilter::Info, <span class="string">&quot;INFO&quot;</span>),
             (LevelFilter::Debug, <span class="string">&quot;DEBUG&quot;</span>),
             (LevelFilter::Trace, <span class="string">&quot;TRACE&quot;</span>),
         ];
         <span class="kw">for </span>(input, expected) <span class="kw">in </span>tests {
             <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>expected, input.as_str());
         }
     }

     <span class="attribute">#[test]
     #[cfg(feature = <span class="string">&quot;std&quot;</span>)]
     </span><span class="kw">fn </span>test_error_trait() {
         <span class="kw">use </span><span class="kw">super</span>::SetLoggerError;
         <span class="kw">let </span>e = SetLoggerError(());
         <span class="macro">assert_eq!</span>(
             <span class="kw-2">&amp;</span>e.to_string(),
             <span class="string">&quot;attempted to set a logger after the logging system \
              was already initialized&quot;
         </span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_metadata_builder() {
         <span class="kw">use </span><span class="kw">super</span>::MetadataBuilder;
         <span class="kw">let </span>target = <span class="string">&quot;myApp&quot;</span>;
         <span class="kw">let </span>metadata_test = MetadataBuilder::new()
             .level(Level::Debug)
             .target(target)
             .build();
         <span class="macro">assert_eq!</span>(metadata_test.level(), Level::Debug);
         <span class="macro">assert_eq!</span>(metadata_test.target(), <span class="string">&quot;myApp&quot;</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_metadata_convenience_builder() {
         <span class="kw">use </span><span class="kw">super</span>::Metadata;
         <span class="kw">let </span>target = <span class="string">&quot;myApp&quot;</span>;
         <span class="kw">let </span>metadata_test = Metadata::builder()
             .level(Level::Debug)
             .target(target)
             .build();
         <span class="macro">assert_eq!</span>(metadata_test.level(), Level::Debug);
         <span class="macro">assert_eq!</span>(metadata_test.target(), <span class="string">&quot;myApp&quot;</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_record_builder() {
         <span class="kw">use super</span>::{MetadataBuilder, RecordBuilder};
         <span class="kw">let </span>target = <span class="string">&quot;myApp&quot;</span>;
         <span class="kw">let </span>metadata = MetadataBuilder::new().target(target).build();
         <span class="kw">let </span>fmt_args = <span class="macro">format_args!</span>(<span class="string">&quot;hello&quot;</span>);
         <span class="kw">let </span>record_test = RecordBuilder::new()
             .args(fmt_args)
             .metadata(metadata)
             .module_path(<span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>))
             .file(<span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>))
             .line(<span class="prelude-val">Some</span>(<span class="number">30</span>))
             .build();
         <span class="macro">assert_eq!</span>(record_test.metadata().target(), <span class="string">&quot;myApp&quot;</span>);
         <span class="macro">assert_eq!</span>(record_test.module_path(), <span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>));
         <span class="macro">assert_eq!</span>(record_test.file(), <span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>));
         <span class="macro">assert_eq!</span>(record_test.line(), <span class="prelude-val">Some</span>(<span class="number">30</span>));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_record_convenience_builder() {
         <span class="kw">use super</span>::{Metadata, Record};
         <span class="kw">let </span>target = <span class="string">&quot;myApp&quot;</span>;
         <span class="kw">let </span>metadata = Metadata::builder().target(target).build();
         <span class="kw">let </span>fmt_args = <span class="macro">format_args!</span>(<span class="string">&quot;hello&quot;</span>);
         <span class="kw">let </span>record_test = Record::builder()
             .args(fmt_args)
             .metadata(metadata)
             .module_path(<span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>))
             .file(<span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>))
             .line(<span class="prelude-val">Some</span>(<span class="number">30</span>))
             .build();
         <span class="macro">assert_eq!</span>(record_test.target(), <span class="string">&quot;myApp&quot;</span>);
         <span class="macro">assert_eq!</span>(record_test.module_path(), <span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>));
         <span class="macro">assert_eq!</span>(record_test.file(), <span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>));
         <span class="macro">assert_eq!</span>(record_test.line(), <span class="prelude-val">Some</span>(<span class="number">30</span>));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_record_complete_builder() {
         <span class="kw">use super</span>::{Level, Record};
         <span class="kw">let </span>target = <span class="string">&quot;myApp&quot;</span>;
         <span class="kw">let </span>record_test = Record::builder()
             .module_path(<span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>))
             .file(<span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>))
             .line(<span class="prelude-val">Some</span>(<span class="number">30</span>))
             .target(target)
             .level(Level::Error)
             .build();
         <span class="macro">assert_eq!</span>(record_test.target(), <span class="string">&quot;myApp&quot;</span>);
         <span class="macro">assert_eq!</span>(record_test.level(), Level::Error);
         <span class="macro">assert_eq!</span>(record_test.module_path(), <span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>));
         <span class="macro">assert_eq!</span>(record_test.file(), <span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>));
         <span class="macro">assert_eq!</span>(record_test.line(), <span class="prelude-val">Some</span>(<span class="number">30</span>));
     }

     <span class="attribute">#[test]
     #[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
     </span><span class="kw">fn </span>test_record_key_values_builder() {
         <span class="kw">use </span><span class="kw">super</span>::Record;
         <span class="kw">use </span>kv::{<span class="self">self</span>, Visitor};

         <span class="kw">struct </span>TestVisitor {
             seen_pairs: usize,
         }

         <span class="kw">impl</span>&lt;<span class="lifetime">&#39;kvs</span>&gt; Visitor&lt;<span class="lifetime">&#39;kvs</span>&gt; <span class="kw">for </span>TestVisitor {
             <span class="kw">fn </span>visit_pair(
                 <span class="kw-2">&amp;mut </span><span class="self">self</span>,
                 <span class="kw">_</span>: kv::Key&lt;<span class="lifetime">&#39;kvs</span>&gt;,
                 <span class="kw">_</span>: kv::Value&lt;<span class="lifetime">&#39;kvs</span>&gt;,
             ) -&gt; <span class="prelude-ty">Result</span>&lt;(), kv::Error&gt; {
                 <span class="self">self</span>.seen_pairs += <span class="number">1</span>;
                 <span class="prelude-val">Ok</span>(())
             }
         }

         <span class="kw">let </span>kvs: <span class="kw-2">&amp;</span>[(<span class="kw-2">&amp;</span>str, i32)] = <span class="kw-2">&amp;</span>[(<span class="string">&quot;a&quot;</span>, <span class="number">1</span>), (<span class="string">&quot;b&quot;</span>, <span class="number">2</span>)];
         <span class="kw">let </span>record_test = Record::builder().key_values(<span class="kw-2">&amp;</span>kvs).build();

         <span class="kw">let </span><span class="kw-2">mut </span>visitor = TestVisitor { seen_pairs: <span class="number">0 </span>};

         record_test.key_values().visit(<span class="kw-2">&amp;mut </span>visitor).unwrap();

         <span class="macro">assert_eq!</span>(<span class="number">2</span>, visitor.seen_pairs);
     }

     <span class="attribute">#[test]
     #[cfg(feature = <span class="string">&quot;kv_unstable&quot;</span>)]
     </span><span class="kw">fn </span>test_record_key_values_get_coerce() {
         <span class="kw">use </span><span class="kw">super</span>::Record;

         <span class="kw">let </span>kvs: <span class="kw-2">&amp;</span>[(<span class="kw-2">&amp;</span>str, <span class="kw-2">&amp;</span>str)] = <span class="kw-2">&amp;</span>[(<span class="string">&quot;a&quot;</span>, <span class="string">&quot;1&quot;</span>), (<span class="string">&quot;b&quot;</span>, <span class="string">&quot;2&quot;</span>)];
         <span class="kw">let </span>record = Record::builder().key_values(<span class="kw-2">&amp;</span>kvs).build();

         <span class="macro">assert_eq!</span>(
             <span class="string">&quot;2&quot;</span>,
             record
                 .key_values()
                 .get(<span class="string">&quot;b&quot;</span>.into())
                 .expect(<span class="string">&quot;missing key&quot;</span>)
                 .to_borrowed_str()
                 .expect(<span class="string">&quot;invalid value&quot;</span>)
         );
     }

     <span class="comment">// Test that the `impl Log for Foo` blocks work
     // This test mostly operates on a type level, so failures will be compile errors
     </span><span class="attribute">#[test]
     </span><span class="kw">fn </span>test_foreign_impl() {
         <span class="kw">use </span><span class="kw">super</span>::Log;
         <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
         </span><span class="kw">use </span>std::sync::Arc;

         <span class="kw">fn </span>assert_is_log&lt;T: Log + <span class="question-mark">?</span>Sized&gt;() {}

         assert_is_log::&lt;<span class="kw-2">&amp;</span><span class="kw">dyn </span>Log&gt;();

         <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
         </span>assert_is_log::&lt;Box&lt;<span class="kw">dyn </span>Log&gt;&gt;();

         <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
         </span>assert_is_log::&lt;Arc&lt;<span class="kw">dyn </span>Log&gt;&gt;();

         <span class="comment">// Assert these statements for all T: Log + ?Sized
         </span><span class="attribute">#[allow(unused)]
         </span><span class="kw">fn </span>forall&lt;T: Log + <span class="question-mark">?</span>Sized&gt;() {
             <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
             </span>assert_is_log::&lt;Box&lt;T&gt;&gt;();

             assert_is_log::&lt;<span class="kw-2">&amp;</span>T&gt;();

             <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
             </span>assert_is_log::&lt;Arc&lt;T&gt;&gt;();
         }
     }
 }
 </code></pre></div>
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