diff options
| -rw-r--r-- | src/libcore/str/mod.rs | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs index 4e8a56fbefb..a5ade2ae2a5 100644 --- a/src/libcore/str/mod.rs +++ b/src/libcore/str/mod.rs @@ -442,7 +442,10 @@ impl<'a> Iterator for Chars<'a> { #[inline] fn size_hint(&self) -> (usize, Option<usize>) { 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)) } } |