properly drop mutually-referring declarations that are not otherwise

referenced and have no side effects

1 files changed, 10 insertions, 7 deletions

diff --git a/lib/transform.js b/lib/transform.js
index 743dd6e7..df51eac3 100644
--- a/lib/transform.js
+++ b/lib/transform.js
@@ -68,14 +68,17 @@ TreeTransformer.prototype = {
         node.DEFMETHOD("transform", function(tw, in_list){
             var x, y;
             tw.push(this);
-            x = tw.before(this, function(){
-                descend(x, tw);
-            }, in_list);
+            x = tw.before(this, descend, in_list);
             if (x === undefined) {
-                x = this.clone();
-                descend(x, tw);
-                y = tw.after(this, in_list);
-                if (y !== undefined) x = y;
+                if (!tw.after) {
+                    x = this;
+                    descend(x, tw);
+                } else {
+                    x = this.clone();
+                    descend(x, tw);
+                    y = tw.after(this, in_list);
+                    if (y !== undefined) x = y;
+                }
             }
             tw.pop();
             return x;