Show #![feature] in example.
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@ -315,7 +315,7 @@ pub fn as_slice(&self) -> &[T] {
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/// Basic usage:
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/// Basic usage:
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///
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///
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/// ```
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/// ```
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/// # #![feature(slice_iter_mut_as_mut_slice)]
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/// #![feature(slice_iter_mut_as_mut_slice)]
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///
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///
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/// let mut slice: &mut [usize] = &mut [1, 2, 3];
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/// let mut slice: &mut [usize] = &mut [1, 2, 3];
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///
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///
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