libcore: fix move semantics fallout

src/libcore/iter.rs

@@ -2166,7 +2166,7 @@ impl<A: Add<A, A> + Clone> Iterator<A> for Counter<A> {
     #[inline]
     fn next(&mut self) -> Option<A> {
         let result = self.state.clone();
-        self.state = self.state + self.step;
+        self.state = self.state.clone() + self.step.clone();
         Some(result)
     }
 

src/libcore/num/mod.rs

@@ -37,8 +37,8 @@ use str::{FromStr, from_str, StrPrelude};
 /// Simultaneous division and remainder
 #[inline]
 #[deprecated = "use division and remainder directly"]
-pub fn div_rem<T: Div<T, T> + Rem<T, T>>(x: T, y: T) -> (T, T) {
-    (x / y, x % y)
+pub fn div_rem<T: Clone + Div<T, T> + Rem<T, T>>(x: T, y: T) -> (T, T) {
+    (x.clone() / y.clone(), x % y)
 }
 
 /// Raises a `base` to the power of `exp`, using exponentiation by squaring.