Canonicalize some size_hint

Author: phimuemue

src/adaptors/mod.rs

@@ -854,8 +854,7 @@ impl<'a, I, F> Iterator for TakeWhileRef<'a, I, F>
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {
-        let (_, hi) = self.iter.size_hint();
-        (0, hi)
+        (0, self.iter.size_hint().1)
     }
 }
 
@@ -887,8 +886,7 @@ impl<I, A> Iterator for WhileSome<I>
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {
-        let sh = self.iter.size_hint();
-        (0, sh.1)
+        (0, self.iter.size_hint().1)
     }
 }
 

src/peeking_take_while.rs

@@ -104,8 +104,7 @@ impl<'a, I, F> Iterator for PeekingTakeWhile<'a, I, F>
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {
-        let (_, hi) = self.iter.size_hint();
-        (0, hi)
+        (0, self.iter.size_hint().1)
     }
 }
 

src/process_results_impl.rs

@@ -28,8 +28,7 @@ impl<'a, I, T, E> Iterator for ProcessResults<'a, I, E>
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {
-        let (_, hi) = self.iter.size_hint();
-        (0, hi)
+        (0, self.iter.size_hint().1)
     }
 }
 

src/rciter_impl.rs

@@ -69,8 +69,7 @@ impl<A, I> Iterator for RcIter<I>
         // To work sanely with other API that assume they own an iterator,
         // so it can't change in other places, we can't guarantee as much
         // in our size_hint. Other clones may drain values under our feet.
-        let (_, hi) = self.rciter.borrow().size_hint();
-        (0, hi)
+        (0, self.rciter.borrow().size_hint().1)
     }
 }