Add DoubleEndedIterator test
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@ -21,6 +21,15 @@ fn iter() {
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assert_eq!(*it.next().unwrap(), 6.0);
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assert!(it.next().is_none());
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let mut it = a.iter();
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assert_eq!(*it.next().unwrap(), 1.0);
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assert_eq!(*it.next_back().unwrap(), 6.0);
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assert_eq!(*it.next_back().unwrap(), 3.0);
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assert_eq!(*it.next_back().unwrap(), 5.0);
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assert_eq!(*it.next().unwrap(), 4.0);
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assert_eq!(*it.next().unwrap(), 2.0);
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assert!(it.next().is_none());
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let row = a.row(0);
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let mut it = row.iter();
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assert_eq!(*it.next().unwrap(), 1.0);
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