fixup! Add circular_tuple_windows

src/tuple_impl.rs

@@ -1,6 +1,9 @@
 //! Some iterator that produces tuples
 
 use std::iter::Fuse;
+use std::iter::Take;
+use std::iter::Cycle;
+use std::marker::PhantomData;
 
 // `HomogeneousTuple` is a public facade for `TupleCollect`, allowing
 // tuple-related methods to be used by clients in generic contexts, while
@@ -196,8 +199,8 @@ pub struct CircularTupleWindows<I, T: Clone>
     where I: Iterator<Item = T::Item> + Clone,
           T: TupleCollect + Clone
 {
-    iter: std::iter::Take<TupleWindows<std::iter::Cycle<I>, T>>,
-    phantom_data: std::marker::PhantomData<T>
+    iter: Take<TupleWindows<Cycle<I>, T>>,
+    phantom_data: PhantomData<T>
 }
 
 pub fn circular_tuple_windows<I, T>(iter: I) -> CircularTupleWindows<I, T>
@@ -210,7 +213,7 @@ pub fn circular_tuple_windows<I, T>(iter: I) -> CircularTupleWindows<I, T>
 
     CircularTupleWindows {
         iter: iter,
-        phantom_data: std::marker::PhantomData{}
+        phantom_data: PhantomData{}
     }
 }