remove silly test that relied on RangeFrom::size_hint returning 0 ins…

…tead of usize::MAX

src/tests.rs

@@ -60,16 +60,12 @@ fn sliding_windows_4() {
     let iter3 = Adaptor::new(0..5, &mut storage3);
 
     let mut storage4: Storage<u32> = Storage::new(6);
-    let iter4 = Adaptor::new(0..0, &mut storage4);
-
-    let mut storage5: Storage<u32> = Storage::new(6);
-    let iter5 = Adaptor::new(0.., &mut storage5);
+    let iter4 = Adaptor::new(42..42, &mut storage4);
 
     assert_eq!(iter1.size_hint(), (3, Some(3)));
     assert_eq!(iter2.size_hint(), (1, Some(1)));
     assert_eq!(iter3.size_hint(), (1, Some(1)));
     assert_eq!(iter4.size_hint(), (0, Some(0)));
-    assert_eq!(iter5.size_hint(), (0, None));
 }
 
 #[test]