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-rw-r--r--src/libextra/bitv.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libextra/bitv.rs b/src/libextra/bitv.rs
index 63d62bd4809..03588d984d9 100644
--- a/src/libextra/bitv.rs
+++ b/src/libextra/bitv.rs
@@ -608,6 +608,8 @@ impl<'self> DoubleEndedIterator<bool> for BitvIterator<'self> {
     }
 }
 
+impl<'self> ExactSize<bool> for BitvIterator<'self> {}
+
 impl<'self> RandomAccessIterator<bool> for BitvIterator<'self> {
     #[inline]
     fn indexable(&self) -> uint {