Use unwrap() instead of expect()

Author: catdesk

src/ir/annotations.rs

@@ -153,8 +153,7 @@ impl Annotations {
         }
 
         for i in 0..comment.num_children() {
-            let child = &comment.get_child(i).expect("index higher than number of children");
-            self.parse(child, matched);
+            self.parse(&comment.get_child(i).unwrap(), matched);
         }
     }
 }