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/// Copy slice `src` to `dst`, return the number of elements copied.
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#[inline]
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pub fn copy_slice<T,U,V>(mut dst: U, src: V) -> usize
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where T: Clone,
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U: AsMut<[T]>,
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V: AsRef<[T]>
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{
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let mut i=0;
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for (d,s) in dst.as_mut().iter_mut().zip(src.as_ref().iter())
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{
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*d = s.clone();
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i+=1;
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}
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i
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}
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