1 files changed, 4 insertions, 10 deletions
diff --git a/lib/compress.js b/lib/compress.js
index dadebe5e..c13421ea 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -80,7 +80,6 @@ merge(Compressor.prototype, {
     },
     before: function(node, descend, in_list) {
         if (node._squeezed) return node;
-        this.stack[this.stack.length - 1] = node = node.clone();
         if (node instanceof AST_Scope) {
             node.drop_unused(this);
             node = node.hoist_declarations(this);
@@ -291,7 +290,7 @@ merge(Compressor.prototype, {
 
                     var ab = aborts(stat.body);
                     if (ab && ((ab instanceof AST_Return && !ab.value && in_lambda)
-                               || (ab instanceof AST_Continue && self.$self === compressor.loopcontrol_target(ab.label)))) {
+                               || (ab instanceof AST_Continue && self === compressor.loopcontrol_target(ab.label)))) {
                         CHANGED = true;
                         var body = as_statement_array(stat.body).slice(0, -1);
                         stat = stat.clone();
@@ -308,7 +307,7 @@ merge(Compressor.prototype, {
 
                     var ab = aborts(stat.alternative);
                     if (ab && ((ab instanceof AST_Return && !ab.value && in_lambda)
-                               || (ab instanceof AST_Continue && self.$self === compressor.loopcontrol_target(ab.label)))) {
+                               || (ab instanceof AST_Continue && self === compressor.loopcontrol_target(ab.label)))) {
                         CHANGED = true;
                         stat = stat.clone();
                         stat.body = make_node(AST_BlockStatement, stat.body, {
@@ -447,7 +446,6 @@ merge(Compressor.prototype, {
         stat.walk(new TreeWalker(function(node){
             if (node instanceof AST_Definitions) {
                 compressor.warn("Declarations in unreachable code! [{file}:{line},{col}]", node.start);
-                node = node.clone();
                 node.remove_initializers();
                 target.push(node);
                 return true;
@@ -1187,7 +1185,7 @@ merge(Compressor.prototype, {
         var last_branch = self.body[self.body.length - 1];
         if (last_branch) {
             var stat = last_branch.body[last_branch.body.length - 1]; // last statement
-            if (stat instanceof AST_Break && compressor.loopcontrol_target(stat.label) === self.$self)
+            if (stat instanceof AST_Break && compressor.loopcontrol_target(stat.label) === self)
                 last_branch.body.pop();
         }
         return self;
@@ -1204,11 +1202,7 @@ merge(Compressor.prototype, {
     });
 
     AST_Definitions.DEFMETHOD("remove_initializers", function(){
-        this.definitions = this.definitions.map(function(def){
-            def = def.clone();
-            def.value = null;
-            return def;
-        });
+        this.definitions.forEach(function(def){ def.value = null });
     });
 
     AST_Definitions.DEFMETHOD("to_assignments", function(){