properly drop mutually-referring declarations that are not otherwise

referenced and have no side effects
2012-09-23 12:47:34 +03:00
parent 76d88b59dc
commit a83b28503f
5 changed files with 137 additions and 67 deletions
--- 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;