drop spurious ExactSizeIterator impl

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/zcoord/zcoord.rs b/zcoord/zcoord.rs
index adda1987dca1a00244521620385a66608bff892e..424f76b725ac009954be80ad3b535f365cd7e4a5 100644 (file)
--- a/zcoord/zcoord.rs
+++ b/zcoord/zcoord.rs
@@ -387,9 +387,6 @@ impl<ASO:AddSubOffset> Iterator for IteratorCore<ASO> {
     Some(self.current.repack().unwrap())
   }
 }
-impl ExactSizeIterator for IteratorCore<AddSubRangeDelta> {
-  fn len(&self) -> usize { return usize::MAX }
-}
 
 pub trait BoxedIteratorTrait : Iterator<Item=ZCoord> + Debug { }
 pub type BoxedIterator = Box<dyn BoxedIteratorTrait>;