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| author | Ulrik Sverdrup <bluss@users.noreply.github.com> | 2016-10-21 19:18:08 +0200 |
|---|---|---|
| committer | Ulrik Sverdrup <bluss@users.noreply.github.com> | 2016-10-21 19:18:08 +0200 |
| commit | ee84ec1fa183dbfa9ce2e26e6e8c12ded3ffddb6 (patch) | |
| tree | 5f4d48d0e990fc828c8fc4f6809dea804a345dbe /src | |
| parent | 622f24f6d9cc952ccf2bb4dbe5bf65bb966194d3 (diff) | |
| download | rust-ee84ec1fa183dbfa9ce2e26e6e8c12ded3ffddb6.tar.gz rust-ee84ec1fa183dbfa9ce2e26e6e8c12ded3ffddb6.zip | |
vec: Add a debug assertion where TrustedLen is used
Diffstat (limited to 'src')
| -rw-r--r-- | src/libcollections/vec.rs | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs index 50ad4856747..8bed02c79e0 100644 --- a/src/libcollections/vec.rs +++ b/src/libcollections/vec.rs @@ -1578,7 +1578,13 @@ impl<I> IsTrustedLen for I where I: Iterator { } impl<I> IsTrustedLen for I where I: TrustedLen { fn trusted_len(&self) -> Option<usize> { - self.size_hint().1 + let (low, high) = self.size_hint(); + if let Some(high_value) = high { + debug_assert_eq!(low, high_value, + "TrustedLen iterator's size hint is not exact: {:?}", + (low, high)); + } + high } } |