Remove unnecessary #![feature]s from doctest.
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@ -240,7 +240,6 @@ impl<'scope, T> ScopedJoinHandle<'scope, T> {
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///
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/// ```
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/// #![feature(scoped_threads)]
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/// #![feature(thread_is_running)]
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///
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/// use std::thread;
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///
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@ -274,7 +273,6 @@ impl<'scope, T> ScopedJoinHandle<'scope, T> {
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///
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/// ```
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/// #![feature(scoped_threads)]
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/// #![feature(thread_is_running)]
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///
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/// use std::thread;
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///
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