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pub fn copy_slice<T,S,D>(mut dst: D, src: S) -> usize
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where S: AsRef<[T]>,
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D: AsMut<[T]>,
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T: Clone
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{
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let mut sz=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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sz+=1;
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}
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sz
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}
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