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src/adaptors/mod.rs

@@ -867,7 +867,7 @@ where
     debug_fmt_fields!(EnumerateOk, iter);
 }
 
-impl<I,T,E> Iterator for EnumerateOk<I> 
+impl<I,T,E> Iterator for EnumerateOk<I>
     where I: Iterator<Item = Result<T,E>>,
 {
     type Item = Result<(usize,T),E>;

src/lib.rs

@@ -848,7 +848,8 @@ pub trait Itertools : Iterator {
     }
 
     /// Return an iterator adaptor that adds an index to `Result::Ok`
-    /// values. `Result::Err` values are unchanged.
+    /// values. `Result::Err` values are unchanged. The index is incremented
+    /// only for `Result::Ok` values.
     ///
     /// ```
     /// use itertools::Itertools;