PeekNth: don't panic on peek_nth(usize::MAX)#1103
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n + 1 overflowed when n was usize::MAX, panicking in debug builds. We can't peek at index usize::MAX anyway (would need usize::MAX+1 buffered items), so just return None up front via checked_add. Closes rust-itertools#1067. Signed-off-by: Charlie Tonneslan <cst0520@gmail.com>
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(n + 1).saturating_sub(...)overflows when n isusize::MAX, panicking in debug builds. We can't actually peek at indexusize::MAX(would needusize::MAX + 1buffered items), so returnNoneup front viachecked_add.Same fix in
peek_nth_mutsince it has the same expression.Closes #1067.