Auto merge of #7018 - Y-Nak:same_item_push, r=Manishearth

Don't trigger `same_item_push` if the vec is used in the loop body

fixes #6987
changelog: `same_item_push`: Don't trigger if the `vec` is used in the loop body

tests/ui/same_item_push.rs

@@ -148,4 +148,11 @@ fn main() {
         };
         vec.push(item);
     }
+
+    // Fix #6987
+    let mut vec = Vec::new();
+    for _ in 0..10 {
+        vec.push(1);
+        vec.extend(&[2]);
+    }
 }