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docs: Remove reference to old tokio feature flag (#857)
The `experimental-tracing` feature flag only existed in tokio 0.1.x and is no longer necessary in tokio 0.2.x
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@ -120,13 +120,6 @@
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//! instead.
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//! instead.
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//! </pre></div>
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//! </pre></div>
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//!
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//!
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//! Finally, `tokio` users should note that versions of `tokio` >= 0.1.22
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//! support an `experimental-tracing` feature flag. When this flag is enabled,
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//! the `tokio` runtime's thread pool will automatically propagate the default
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//! subscriber. This means that if `tokio::runtime::Runtime::new()` or
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//! `tokio::run()` are invoked when a default subscriber is set, it will also be
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//! set by all worker threads created by that runtime.
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//!
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//! ## Accessing the Default Subscriber
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//! ## Accessing the Default Subscriber
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//!
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//!
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//! A thread's current default subscriber can be accessed using the
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//! A thread's current default subscriber can be accessed using the
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@ -118,13 +118,6 @@
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//! instead.
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//! instead.
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//! </pre></div>
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//! </pre></div>
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//!
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//!
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//! Finally, `tokio` users should note that versions of `tokio` >= 0.1.22
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//! support an `experimental-tracing` feature flag. When this flag is enabled,
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//! the `tokio` runtime's thread pool will automatically propagate the default
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//! subscriber. This means that if `tokio::runtime::Runtime::new()` or
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//! `tokio::run()` are invoked when a default subscriber is set, it will also be
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//! set by all worker threads created by that runtime.
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//!
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//! ## Accessing the Default Subscriber
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//! ## Accessing the Default Subscriber
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//!
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//!
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//! A thread's current default subscriber can be accessed using the
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//! A thread's current default subscriber can be accessed using the
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