remove Clone bound from tuple_combinations

Author: ronnodas

src/adaptors/mod.rs

@@ -629,7 +629,7 @@ pub trait HasCombination<I>: Sized {
 /// Create a new `TupleCombinations` from a clonable iterator.
 pub fn tuple_combinations<T, I>(iter: I) -> TupleCombinations<I, T>
 where
-    I: Iterator + Clone,
+    I: Iterator,
     I::Item: Clone,
     T: HasCombination<I>,
 {

src/lib.rs

@@ -1667,7 +1667,7 @@ pub trait Itertools: Iterator {
     /// ```
     fn tuple_combinations<T>(self) -> TupleCombinations<Self, T>
     where
-        Self: Sized + Clone,
+        Self: Sized,
         Self::Item: Clone,
         T: adaptors::HasCombination<Self>,
     {