Add broken test

Author: GnomedDev

tests/ui/unnecessary_collection_clone.fixed

@@ -19,6 +19,14 @@ fn generic<T: Clone>(val: Vec<T>) -> Vec<T> {
     //~^ error: using clone on collection to own iterated items
 }
 
+fn used_mutably<T: Clone>(mut vals: Vec<T>) {
+    fn use_mutable<T>(_: &mut T) {}
+
+    for val in vals.iter().cloned() {
+        use_mutable(&mut vals)
+    }
+}
+
 // Should not lint, as `Src` has no `iter` method to use.
 fn too_generic<Src, Dst, T: Clone>(val: Src) -> Dst
 where

tests/ui/unnecessary_collection_clone.rs

@@ -19,6 +19,14 @@ fn generic<T: Clone>(val: Vec<T>) -> Vec<T> {
     //~^ error: using clone on collection to own iterated items
 }
 
+fn used_mutably<T: Clone>(mut vals: Vec<T>) {
+    fn use_mutable<T>(_: &mut T) {}
+
+    for val in vals.clone().into_iter() {
+        use_mutable(&mut vals)
+    }
+}
+
 // Should not lint, as `Src` has no `iter` method to use.
 fn too_generic<Src, Dst, T: Clone>(val: Src) -> Dst
 where

tests/ui/unnecessary_collection_clone.stderr

@@ -19,5 +19,11 @@ error: using clone on collection to own iterated items
 LL |     val.clone().into_iter().collect()
    |     ^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `val.iter().cloned()`
 
-error: aborting due to 3 previous errors
+error: using clone on collection to own iterated items
+  --> tests/ui/unnecessary_collection_clone.rs:25:16
+   |
+LL |     for val in vals.clone().into_iter() {
+   |                ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `vals.iter().cloned()`
+
+error: aborting due to 4 previous errors