diff --git a/lib/compiler/visitor.js b/lib/compiler/visitor.js
index 9bb9532..8f5d08a 100644
--- a/lib/compiler/visitor.js
+++ b/lib/compiler/visitor.js
@@ -7,7 +7,9 @@ let visitor = {
       return functions[node.type].apply(null, arguments);
     }
 
-    function visitNop() { }
+    function visitNop() {
+      // Do nothing.
+    }
 
     function visitExpression(node) {
       let extraArgs = Array.prototype.slice.call(arguments, 1);