Only descend twice after drop_unused if it's the same node type.

Fix #345

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/compress.js b/lib/compress.js
index f44277cd..c60ee19e 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -85,13 +85,14 @@ merge(Compressor.prototype, {
     },
     before: function(node, descend, in_list) {
         if (node._squeezed) return node;
+        var was_scope = false;
         if (node instanceof AST_Scope) {
-            //node.drop_unused(this);
             node = node.hoist_declarations(this);
+            was_scope = true;
         }
         descend(node, this);
         node = node.optimize(this);
-        if (node instanceof AST_Scope) {
+        if (was_scope && node instanceof AST_Scope) {
             node.drop_unused(this);
             descend(node, this);
         }