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Auto merge of #23251 - tbu-:pr_rm_core_str_checked_add, r=alexcrichton

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bors 2015-03-11 01:39:49 +00:00
commit f899513a30
1 changed files with 4 additions and 1 deletions
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5
src/libcore/str/mod.rs
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@ -442,7 +442,10 @@ impl<'a> Iterator for Chars<'a> {
#[inline] #[inline]
fn size_hint(&self) -> (usize, Option<usize>) { fn size_hint(&self) -> (usize, Option<usize>) {
let (len, _) = self.iter.size_hint(); let (len, _) = self.iter.size_hint();
(len.saturating_add(3) / 4, Some(len)) // `(len + 3)` can't overflow, because we know that the `slice::Iter`
// belongs to a slice in memory which has a maximum length of
// `isize::MAX` (that's well below `usize::MAX`).
((len + 3) / 4, Some(len))
} }
} }