diff --git a/bin/uglifyjs b/bin/uglifyjs
index cecc98be..311e7138 100755
--- a/bin/uglifyjs
+++ b/bin/uglifyjs
@@ -11,7 +11,7 @@ var path = require("path");
 var program = require("commander");
 var UglifyJS = require("../tools/node");
 
-var skip_keys = [ "cname", "enclosed", "inlined", "parent_scope", "scope", "thedef", "uses_eval", "uses_with" ];
+var skip_keys = [ "cname", "inlined", "parent_scope", "scope", "uses_eval", "uses_with" ];
 var files = {};
 var options = {
     compress: false,
@@ -234,7 +234,33 @@ function run() {
         }
         fatal(ex);
     } else if (program.output == "ast") {
+        if (!options.compress && !options.mangle) {
+            result.ast.figure_out_scope({});
+        }
         print(JSON.stringify(result.ast, function(key, value) {
+            switch (key) {
+              case "thedef":
+                if (typeof value == "object" && typeof value.id == "number") {
+                    return value.id;
+                }
+                return;
+              case "enclosed":
+                return value.map(function(sym){
+                    return sym.id;
+                });
+              case "variables":
+              case "functions":
+              case "globals":
+                if (value && value.size()) {
+                    var ret = {};
+                    value.each(function(val, key) {
+                        // key/val inverted for readability.
+                        ret[val.id] = key;
+                    });
+                    return ret;
+                }
+                return;
+            }
             if (skip_key(key)) return;
             if (value instanceof UglifyJS.AST_Token) return;
             if (value instanceof UglifyJS.Dictionary) return;
diff --git a/lib/compress.js b/lib/compress.js
index e80d7a99..773c0d60 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -489,8 +489,9 @@ merge(Compressor.prototype, {
             if (node instanceof AST_SymbolRef) d.references.push(node);
             d.fixed = false;
         });
-        def(AST_Accessor, function(tw, descend) {
+        def(AST_Accessor, function(tw, descend, compressor) {
             push(tw);
+            reset_variables(tw, compressor, this);
             descend();
             pop(tw);
             return true;
@@ -947,6 +948,7 @@ merge(Compressor.prototype, {
     }
 
     function tighten_body(statements, compressor) {
+        var scope = compressor.find_parent(AST_Scope).get_defun_scope();
         var CHANGED, max_iter = 10;
         do {
             CHANGED = false;
@@ -978,7 +980,6 @@ merge(Compressor.prototype, {
         // Will not attempt to collapse assignments into or past code blocks
         // which are not sequentially executed, e.g. loops and conditionals.
         function collapse(statements, compressor) {
-            var scope = compressor.find_parent(AST_Scope).get_defun_scope();
             if (scope.uses_eval || scope.uses_with) return statements;
             var args;
             var candidates = [];
@@ -1640,7 +1641,7 @@ merge(Compressor.prototype, {
             function next_index(i) {
                 for (var j = i + 1, len = statements.length; j < len; j++) {
                     var stat = statements[j];
-                    if (!(stat instanceof AST_Definitions && declarations_only(stat))) {
+                    if (!(stat instanceof AST_Var && declarations_only(stat))) {
                         break;
                     }
                 }
@@ -1650,7 +1651,7 @@ merge(Compressor.prototype, {
             function prev_index(i) {
                 for (var j = i; --j >= 0;) {
                     var stat = statements[j];
-                    if (!(stat instanceof AST_Definitions && declarations_only(stat))) {
+                    if (!(stat instanceof AST_Var && declarations_only(stat))) {
                         break;
                     }
                 }
@@ -1813,6 +1814,41 @@ merge(Compressor.prototype, {
             statements.length = n;
         }
 
+        function join_object_assignments(defn, body) {
+            if (!(defn instanceof AST_Definitions)) return;
+            var def = defn.definitions[defn.definitions.length - 1];
+            if (!(def.value instanceof AST_Object)) return;
+            var exprs;
+            if (body instanceof AST_Assign) {
+                exprs = [ body ];
+            } else if (body instanceof AST_Sequence) {
+                exprs = body.expressions.slice();
+            }
+            if (!exprs) return;
+            var trimmed = false;
+            do {
+                var node = exprs[0];
+                if (!(node instanceof AST_Assign)) break;
+                if (!(node.left instanceof AST_PropAccess)) break;
+                var sym = node.left.expression;
+                if (!(sym instanceof AST_SymbolRef)) break;
+                if (def.name.name != sym.name) break;
+                if (!node.right.is_constant_expression(scope)) break;
+                var prop = node.left.property;
+                if (prop instanceof AST_Node) {
+                    prop = prop.evaluate(compressor);
+                }
+                if (prop instanceof AST_Node) break;
+                def.value.properties.push(make_node(AST_ObjectKeyVal, node, {
+                    key: prop,
+                    value: node.right
+                }));
+                exprs.shift();
+                trimmed = true;
+            } while (exprs.length);
+            return trimmed && exprs;
+        }
+
         function join_consecutive_vars(statements, compressor) {
             var defs;
             for (var i = 0, j = -1, len = statements.length; i < len; i++) {
@@ -1845,6 +1881,14 @@ merge(Compressor.prototype, {
                     } else {
                         statements[++j] = stat;
                     }
+                } else if (stat instanceof AST_SimpleStatement) {
+                    var exprs = join_object_assignments(prev, stat.body);
+                    if (exprs) {
+                        CHANGED = true;
+                        if (!exprs.length) continue;
+                        stat.body = make_sequence(stat.body, exprs);
+                    }
+                    statements[++j] = stat;
                 } else {
                     statements[++j] = stat;
                 }
@@ -2952,7 +2996,7 @@ merge(Compressor.prototype, {
                             var node_def = def.name.definition();;
                             initializations.add(node_def.id, def.value);
                             if (def.name.fixed_value() === def.value) {
-                                fixed_ids[node_def.id] = true;
+                                fixed_ids[node_def.id] = def;
                             }
                         }
                         if (def.value.has_side_effects(compressor)) {
@@ -2988,9 +3032,7 @@ merge(Compressor.prototype, {
                         var def = sym.definition();
                         var in_use = def.id in in_use_ids;
                         if (node instanceof AST_Assign) {
-                            if (!in_use
-                                || def.id in fixed_ids
-                                    && node.left.fixed_value() !== node.right) {
+                            if (!in_use || def.id in fixed_ids && fixed_ids[def.id] !== node) {
                                 return maintain_this_binding(parent, node, node.right.transform(tt));
                             }
                         } else if (!in_use) return make_node(AST_Number, node, {
@@ -3059,25 +3101,29 @@ merge(Compressor.prototype, {
                         var sym = def.name.definition();
                         if (drop_block && sym.global) return tail.push(def);
                         if (!(drop_vars || drop_block) || sym.id in in_use_ids) {
+                            if (def.value && sym.id in fixed_ids && fixed_ids[sym.id] !== def) {
+                                def.value = def.value.drop_side_effect_free(compressor);
+                            }
                             if (def.name instanceof AST_SymbolVar) {
                                 var var_defs = var_defs_by_id.get(sym.id);
                                 if (var_defs.length > 1 && (!def.value || sym.orig.indexOf(def.name) > sym.eliminated)) {
                                     compressor.warn("Dropping duplicated definition of variable {name} [{file}:{line},{col}]", template(def.name));
                                     if (def.value) {
-                                        side_effects.push(make_node(AST_Assign, def, {
+                                        var assign = make_node(AST_Assign, def, {
                                             operator: "=",
                                             left: make_node(AST_SymbolRef, def.name, def.name),
                                             right: def.value
-                                        }).transform(tt));
+                                        });
+                                        if (fixed_ids[sym.id] === def) {
+                                            fixed_ids[sym.id] = assign;
+                                        }
+                                        side_effects.push(assign.transform(tt));
                                     }
                                     remove(var_defs, def);
                                     sym.eliminated++;
                                     return;
                                 }
                             }
-                            if (def.value && sym.id in fixed_ids && def.name.fixed_value() !== def.value) {
-                                def.value = def.value.drop_side_effect_free(compressor);
-                            }
                             if (def.value) {
                                 if (side_effects.length > 0) {
                                     if (tail.length > 0) {
@@ -3196,7 +3242,7 @@ merge(Compressor.prototype, {
                 if (node instanceof AST_Assign) {
                     node.right.walk(tw);
                     if (node.left.fixed_value() === node.right) {
-                        fixed_ids[node_def.id] = true;
+                        fixed_ids[node_def.id] = node;
                     }
                 }
                 return true;
@@ -3648,23 +3694,28 @@ merge(Compressor.prototype, {
     });
 
     function if_break_in_loop(self, compressor) {
-        function drop_it(rest) {
-            rest = as_statement_array(rest);
-            if (self.body instanceof AST_BlockStatement) {
-                self.body = self.body.clone();
-                self.body.body = rest.concat(self.body.body.slice(1));
-                self.body = self.body.transform(compressor);
-            } else {
-                self.body = make_node(AST_BlockStatement, self.body, {
-                    body: rest
-                }).transform(compressor);
-            }
-            if_break_in_loop(self, compressor);
-        }
         var first = self.body instanceof AST_BlockStatement ? self.body.body[0] : self.body;
+        if (compressor.option("dead_code") && is_break(first)) {
+            var body = [];
+            if (self.init instanceof AST_Statement) {
+                body.push(self.init);
+            } else if (self.init) {
+                body.push(make_node(AST_SimpleStatement, self.init, {
+                    body: self.init
+                }));
+            }
+            if (self.condition) {
+                body.push(make_node(AST_SimpleStatement, self.condition, {
+                    body: self.condition
+                }));
+            }
+            extract_declarations_from_unreachable_code(compressor, self.body, body);
+            return make_node(AST_BlockStatement, self, {
+                body: body
+            });
+        }
         if (first instanceof AST_If) {
-            if (first.body instanceof AST_Break
-                && compressor.loopcontrol_target(first.body) === compressor.self()) {
+            if (is_break(first.body)) {
                 if (self.condition) {
                     self.condition = make_node(AST_Binary, self.condition, {
                         left: self.condition,
@@ -3675,9 +3726,7 @@ merge(Compressor.prototype, {
                     self.condition = first.condition.negate(compressor);
                 }
                 drop_it(first.alternative);
-            }
-            else if (first.alternative instanceof AST_Break
-                     && compressor.loopcontrol_target(first.alternative) === compressor.self()) {
+            } else if (is_break(first.alternative)) {
                 if (self.condition) {
                     self.condition = make_node(AST_Binary, self.condition, {
                         left: self.condition,
@@ -3690,7 +3739,27 @@ merge(Compressor.prototype, {
                 drop_it(first.body);
             }
         }
-    };
+        return self;
+
+        function is_break(node) {
+            return node instanceof AST_Break
+                && compressor.loopcontrol_target(node) === compressor.self();
+        }
+
+        function drop_it(rest) {
+            rest = as_statement_array(rest);
+            if (self.body instanceof AST_BlockStatement) {
+                self.body = self.body.clone();
+                self.body.body = rest.concat(self.body.body.slice(1));
+                self.body = self.body.transform(compressor);
+            } else {
+                self.body = make_node(AST_BlockStatement, self.body, {
+                    body: rest
+                }).transform(compressor);
+            }
+            self = if_break_in_loop(self, compressor);
+        }
+    }
 
     OPT(AST_For, function(self, compressor){
         if (!compressor.option("loops")) return self;
@@ -3726,8 +3795,7 @@ merge(Compressor.prototype, {
                 }
             }
         }
-        if_break_in_loop(self, compressor);
-        return self;
+        return if_break_in_loop(self, compressor);
     });
 
     OPT(AST_If, function(self, compressor){
@@ -3983,9 +4051,20 @@ merge(Compressor.prototype, {
     OPT(AST_Try, function(self, compressor){
         tighten_body(self.body, compressor);
         if (self.bcatch && self.bfinally && all(self.bfinally.body, is_empty)) self.bfinally = null;
-        if (all(self.body, is_empty)) {
+        if (compressor.option("dead_code") && all(self.body, is_empty)) {
             var body = [];
-            if (self.bcatch) extract_declarations_from_unreachable_code(compressor, self.bcatch, body);
+            if (self.bcatch) {
+                extract_declarations_from_unreachable_code(compressor, self.bcatch, body);
+                body.forEach(function(stat) {
+                    if (!(stat instanceof AST_Definitions)) return;
+                    stat.definitions.forEach(function(var_def) {
+                        var def = var_def.name.definition().redefined();
+                        if (!def) return;
+                        var_def.name = var_def.name.clone();
+                        var_def.name.thedef = def;
+                    });
+                });
+            }
             if (self.bfinally) body = body.concat(self.bfinally.body);
             return make_node(AST_BlockStatement, self, {
                 body: body
@@ -5576,6 +5655,20 @@ merge(Compressor.prototype, {
                 consequent
             ]).optimize(compressor);
         }
+        // x ? y || z : z --> x && y || z
+        if (consequent instanceof AST_Binary
+            && consequent.operator == "||"
+            && consequent.right.equivalent_to(alternative)) {
+            return make_node(AST_Binary, self, {
+                operator: "||",
+                left: make_node(AST_Binary, self, {
+                    operator: "&&",
+                    left: self.condition,
+                    right: consequent.left
+                }),
+                right: alternative
+            }).optimize(compressor);
+        }
         var in_bool = compressor.in_boolean_context();
         if (is_true(self.consequent)) {
             if (is_false(self.alternative)) {
diff --git a/lib/output.js b/lib/output.js
index b2353a4c..139075b3 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -476,79 +476,78 @@ function OutputStream(options) {
         var self = this;
         var start = node.start;
         if (!start) return;
-        if (!(start.comments_before && start.comments_before._dumped === self)) {
-            var comments = start.comments_before;
-            if (!comments) {
-                comments = start.comments_before = [];
-            }
-            comments._dumped = self;
+        if (start.comments_before && start.comments_before._dumped === self) return;
+        var comments = start.comments_before;
+        if (!comments) {
+            comments = start.comments_before = [];
+        }
+        comments._dumped = self;
 
-            if (node instanceof AST_Exit && node.value) {
-                var tw = new TreeWalker(function(node) {
-                    var parent = tw.parent();
-                    if (parent instanceof AST_Exit
-                        || parent instanceof AST_Binary && parent.left === node
-                        || parent.TYPE == "Call" && parent.expression === node
-                        || parent instanceof AST_Conditional && parent.condition === node
-                        || parent instanceof AST_Dot && parent.expression === node
-                        || parent instanceof AST_Sequence && parent.expressions[0] === node
-                        || parent instanceof AST_Sub && parent.expression === node
-                        || parent instanceof AST_UnaryPostfix) {
-                        if (!node.start) return;
-                        var text = node.start.comments_before;
-                        if (text && text._dumped !== self) {
-                            text._dumped = self;
-                            comments = comments.concat(text);
-                        }
-                    } else {
-                        return true;
+        if (node instanceof AST_Exit && node.value) {
+            var tw = new TreeWalker(function(node) {
+                var parent = tw.parent();
+                if (parent instanceof AST_Exit
+                    || parent instanceof AST_Binary && parent.left === node
+                    || parent.TYPE == "Call" && parent.expression === node
+                    || parent instanceof AST_Conditional && parent.condition === node
+                    || parent instanceof AST_Dot && parent.expression === node
+                    || parent instanceof AST_Sequence && parent.expressions[0] === node
+                    || parent instanceof AST_Sub && parent.expression === node
+                    || parent instanceof AST_UnaryPostfix) {
+                    if (!node.start) return;
+                    var text = node.start.comments_before;
+                    if (text && text._dumped !== self) {
+                        text._dumped = self;
+                        comments = comments.concat(text);
                     }
-                });
-                tw.push(node);
-                node.value.walk(tw);
-            }
-
-            if (current_pos == 0) {
-                if (comments.length > 0 && options.shebang && comments[0].type == "comment5") {
-                    print("#!" + comments.shift().value + "\n");
-                    indent();
-                }
-                var preamble = options.preamble;
-                if (preamble) {
-                    print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
-                }
-            }
-
-            comments = comments.filter(comment_filter, node);
-            if (comments.length == 0) return;
-            var last_nlb = /(^|\n) *$/.test(OUTPUT);
-            comments.forEach(function(c, i) {
-                if (!last_nlb) {
-                    if (c.nlb) {
-                        print("\n");
-                        indent();
-                        last_nlb = true;
-                    } else if (i > 0) {
-                        space();
-                    }
-                }
-                if (/comment[134]/.test(c.type)) {
-                    print("//" + c.value.replace(/[@#]__PURE__/g, ' ') + "\n");
-                    indent();
-                    last_nlb = true;
-                } else if (c.type == "comment2") {
-                    print("/*" + c.value.replace(/[@#]__PURE__/g, ' ') + "*/");
-                    last_nlb = false;
+                } else {
+                    return true;
                 }
             });
+            tw.push(node);
+            node.value.walk(tw);
+        }
+
+        if (current_pos == 0) {
+            if (comments.length > 0 && options.shebang && comments[0].type == "comment5") {
+                print("#!" + comments.shift().value + "\n");
+                indent();
+            }
+            var preamble = options.preamble;
+            if (preamble) {
+                print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
+            }
+        }
+
+        comments = comments.filter(comment_filter, node);
+        if (comments.length == 0) return;
+        var last_nlb = /(^|\n) *$/.test(OUTPUT);
+        comments.forEach(function(c, i) {
             if (!last_nlb) {
-                if (start.nlb) {
+                if (c.nlb) {
                     print("\n");
                     indent();
-                } else {
+                    last_nlb = true;
+                } else if (i > 0) {
                     space();
                 }
             }
+            if (/comment[134]/.test(c.type)) {
+                print("//" + c.value.replace(/[@#]__PURE__/g, ' ') + "\n");
+                indent();
+                last_nlb = true;
+            } else if (c.type == "comment2") {
+                print("/*" + c.value.replace(/[@#]__PURE__/g, ' ') + "*/");
+                last_nlb = false;
+            }
+        });
+        if (!last_nlb) {
+            if (start.nlb) {
+                print("\n");
+                indent();
+            } else {
+                space();
+            }
         }
     }
 
@@ -557,35 +556,33 @@ function OutputStream(options) {
         var token = node.end;
         if (!token) return;
         var comments = token[tail ? "comments_before" : "comments_after"];
-        if (comments
-            && comments._dumped !== self
-            && (node instanceof AST_Statement || all(comments, function(c) {
-                return !/comment[134]/.test(c.type);
-            }))) {
-            comments._dumped = self;
-            var insert = OUTPUT.length;
-            comments.filter(comment_filter, node).forEach(function(c, i) {
-                need_space = false;
-                if (need_newline_indented) {
-                    print("\n");
-                    indent();
-                    need_newline_indented = false;
-                } else if (c.nlb && (i > 0 || !/(^|\n) *$/.test(OUTPUT))) {
-                    print("\n");
-                    indent();
-                } else if (i > 0 || !tail) {
-                    space();
-                }
-                if (/comment[134]/.test(c.type)) {
-                    print("//" + c.value.replace(/[@#]__PURE__/g, ' '));
-                    need_newline_indented = true;
-                } else if (c.type == "comment2") {
-                    print("/*" + c.value.replace(/[@#]__PURE__/g, ' ') + "*/");
-                    need_space = true;
-                }
-            });
-            if (OUTPUT.length > insert) newline_insert = insert;
-        }
+        if (!comments || comments._dumped === self) return;
+        if (!(node instanceof AST_Statement || all(comments, function(c) {
+            return !/comment[134]/.test(c.type);
+        }))) return;
+        comments._dumped = self;
+        var insert = OUTPUT.length;
+        comments.filter(comment_filter, node).forEach(function(c, i) {
+            need_space = false;
+            if (need_newline_indented) {
+                print("\n");
+                indent();
+                need_newline_indented = false;
+            } else if (c.nlb && (i > 0 || !/(^|\n) *$/.test(OUTPUT))) {
+                print("\n");
+                indent();
+            } else if (i > 0 || !tail) {
+                space();
+            }
+            if (/comment[134]/.test(c.type)) {
+                print("//" + c.value.replace(/[@#]__PURE__/g, ' '));
+                need_newline_indented = true;
+            } else if (c.type == "comment2") {
+                print("/*" + c.value.replace(/[@#]__PURE__/g, ' ') + "*/");
+                need_space = true;
+            }
+        });
+        if (OUTPUT.length > insert) newline_insert = insert;
     }
 
     var stack = [];
diff --git a/lib/scope.js b/lib/scope.js
index a19853ee..a118aa8b 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -58,7 +58,7 @@ function SymbolDef(scope, orig, init) {
     this.id = SymbolDef.next_id++;
 };
 
-SymbolDef.next_id = 1;
+SymbolDef.next_id = 1e6;
 
 SymbolDef.prototype = {
     unmangleable: function(options) {
@@ -576,59 +576,55 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
     }
 });
 
-AST_Toplevel.DEFMETHOD("find_unique_prefix", function(options) {
-    var letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_";
+AST_Toplevel.DEFMETHOD("find_colliding_names", function(options) {
     var cache = options.cache && options.cache.props;
-    var prefixes = Object.create(null);
-    options.reserved.forEach(add_prefix);
+    var avoid = Object.create(null);
+    options.reserved.forEach(to_avoid);
     this.globals.each(add_def);
     this.walk(new TreeWalker(function(node) {
         if (node instanceof AST_Scope) node.variables.each(add_def);
         if (node instanceof AST_SymbolCatch) add_def(node.definition());
     }));
-    var prefix, i = 0;
-    do {
-        prefix = create_name(i++);
-    } while (prefixes[prefix]);
-    return prefix;
+    return avoid;
 
-    function add_prefix(name) {
-        if (/[0-9]$/.test(name)) {
-            prefixes[name.replace(/[0-9]+$/, "")] = true;
-        }
+    function to_avoid(name) {
+        avoid[name] = true;
     }
 
     function add_def(def) {
         var name = def.name;
         if (def.global && cache && cache.has(name)) name = cache.get(name);
         else if (!def.unmangleable(options)) return;
-        add_prefix(name);
-    }
-
-    function create_name(num) {
-        var name = "";
-        do {
-            name += letters[num % letters.length];
-            num = Math.floor(num / letters.length);
-        } while (num);
-        return name;
+        to_avoid(name);
     }
 });
 
 AST_Toplevel.DEFMETHOD("expand_names", function(options) {
+    base54.reset();
+    base54.sort();
     options = this._default_mangler_options(options);
-    var prefix = this.find_unique_prefix(options);
+    var avoid = this.find_colliding_names(options);
+    var cname = 0;
     this.globals.each(rename);
     this.walk(new TreeWalker(function(node) {
         if (node instanceof AST_Scope) node.variables.each(rename);
         if (node instanceof AST_SymbolCatch) rename(node.definition());
     }));
 
+    function next_name() {
+        var name;
+        do {
+            name = base54(cname++);
+        } while (avoid[name] || !is_identifier(name));
+        return name;
+    }
+
     function rename(def) {
-        if (def.global || def.unmangleable(options)) return;
+        if (def.global && options.cache) return;
+        if (def.unmangleable(options)) return;
         if (member(def.name, options.reserved)) return;
         var d = def.redefined();
-        def.name = d ? d.name : prefix + def.id;
+        def.name = d ? d.name : next_name();
         def.orig.forEach(function(sym) {
             sym.name = def.name;
         });
diff --git a/package.json b/package.json
index 1902590e..231f2333 100644
--- a/package.json
+++ b/package.json
@@ -4,17 +4,15 @@
   "homepage": "https://github.com/mishoo/UglifyJS2/tree/harmony",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.3.5",
+  "version": "3.3.6",
   "engines": {
     "node": ">=0.8.0"
   },
   "maintainers": [
+    "Alex Lam <alexlamsl@gmail.com>",
     "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)"
   ],
-  "repository": "git+https://github.com/mishoo/UglifyJS2.git#harmony",
-  "bugs": {
-    "url": "https://github.com/mishoo/UglifyJS2/issues"
-  },
+  "repository": "https://github.com/mishoo/UglifyJS2.git#harmony",
   "main": "tools/node.js",
   "bin": {
     "uglifyjs": "bin/uglifyjs"
@@ -26,11 +24,11 @@
     "LICENSE"
   ],
   "dependencies": {
-    "commander": "~2.12.1",
+    "commander": "~2.13.0",
     "source-map": "~0.6.1"
   },
   "devDependencies": {
-    "acorn": "~5.2.1",
+    "acorn": "~5.3.0",
     "mocha": "~3.5.1",
     "semver": "~5.4.1"
   },
diff --git a/test/compress/collapse_vars.js b/test/compress/collapse_vars.js
index a819ac95..ed3da314 100644
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -2296,6 +2296,7 @@ toplevel_single_reference: {
 unused_orig: {
     options = {
         collapse_vars: true,
+        dead_code: true,
         passes: 2,
         reduce_funcs: true,
         reduce_vars: true,
diff --git a/test/compress/conditionals.js b/test/compress/conditionals.js
index 7838fdbb..e37c5556 100644
--- a/test/compress/conditionals.js
+++ b/test/compress/conditionals.js
@@ -1224,3 +1224,46 @@ hoist_decl: {
         x() ? y() : z();
     }
 }
+
+to_and_or: {
+    options = {
+        conditionals: true,
+    }
+    input: {
+        var values = [
+            0,
+            null,
+            true,
+            "foo",
+            false,
+            -1 / 0,
+            void 0,
+        ];
+        values.forEach(function(x) {
+            values.forEach(function(y) {
+                values.forEach(function(z) {
+                    console.log(x ? y || z : z);
+                });
+            });
+        });
+    }
+    expect: {
+        var values = [
+            0,
+            null,
+            true,
+            "foo",
+            false,
+            -1 / 0,
+            void 0,
+        ];
+        values.forEach(function(x) {
+            values.forEach(function(y) {
+                values.forEach(function(z) {
+                    console.log(x && y || z);
+                });
+            });
+        });
+    }
+    expect_stdout: true
+}
diff --git a/test/compress/dead-code.js b/test/compress/dead-code.js
index eb213b95..17aadba7 100644
--- a/test/compress/dead-code.js
+++ b/test/compress/dead-code.js
@@ -1128,3 +1128,32 @@ issue_2701: {
     }
     expect_stdout: "function"
 }
+
+issue_2749: {
+    options = {
+        dead_code: true,
+        inline: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 2, c = "PASS";
+        while (a--)
+            (function() {
+                return b ? c = "FAIL" : b = 1;
+                try {
+                } catch (b) {
+                    var b;
+                }
+            })();
+        console.log(c);
+    }
+    expect: {
+        var a = 2, c = "PASS";
+        while (a--)
+            b = void 0, b ? c = "FAIL" : b = 1;
+        var b;
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
diff --git a/test/compress/drop-unused.js b/test/compress/drop-unused.js
index 9101c38f..0324d722 100644
--- a/test/compress/drop-unused.js
+++ b/test/compress/drop-unused.js
@@ -2018,3 +2018,51 @@ cascade_drop_assign: {
     }
     expect_stdout: "PASS"
 }
+
+chained_3: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function(a, b) {
+            var c = a, c = b;
+            b++;
+            return c;
+        }(1, 2));
+    }
+    expect: {
+        console.log(function(a, b) {
+            var c = b;
+            b++;
+            return c;
+        }(0, 2));
+    }
+    expect_stdout: "2"
+}
+
+issue_2768: {
+    options = {
+        inline: true,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = "FAIL", c = 1;
+        var c = function(b) {
+            var d = b = a;
+            var e = --b + (d && (a = "PASS"));
+        }();
+        console.log(a, typeof c);
+    }
+    expect: {
+        var a = "FAIL";
+        var c = (d = a, 0, void (d && (a = "PASS")));
+        var d;
+        console.log(a, typeof c);
+    }
+    expect_stdout: "PASS undefined"
+}
diff --git a/test/compress/loops.js b/test/compress/loops.js
index c5934f6f..213a107f 100644
--- a/test/compress/loops.js
+++ b/test/compress/loops.js
@@ -536,3 +536,116 @@ dead_code_condition: {
     }
     expect_stdout: "1"
 }
+
+issue_2740_1: {
+    options = {
+        dead_code: true,
+        loops: true,
+    }
+    input: {
+        for (; ; ) break;
+        for (a(); ; ) break;
+        for (; b(); ) break;
+        for (c(); d(); ) break;
+        for (; ; e()) break;
+        for (f(); ; g()) break;
+        for (; h(); i()) break;
+        for (j(); k(); l()) break;
+    }
+    expect: {
+        a();
+        b();
+        c();
+        d();
+        f();
+        h();
+        j();
+        k();
+    }
+}
+
+issue_2740_2: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: while (x()) {
+            break L1;
+        }
+    }
+    expect: {
+        x();
+    }
+}
+
+issue_2740_3: {
+    options = {
+        dead_code: true,
+        loops: true,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            L2: for (var y = 0; y < 2; y++) {
+                break L1;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        L1: for (var x = 0; x < 3; x++)
+            for (var y = 0; y < 2; y++)
+                break L1;
+        console.log(x, y);
+    }
+    expect_stdout: "0 0"
+}
+
+issue_2740_4: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            L2: for (var y = 0; y < 2; y++) {
+                break L2;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        for (var x = 0; x < 3; x++) {
+            var y = 0;
+            y < 2;
+        }
+        console.log(x, y);
+    }
+    expect_stdout: "3 0"
+}
+
+issue_2740_5: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            break L1;
+            L2: for (var y = 0; y < 2; y++) {
+                break L2;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        var x = 0;
+        x < 3;
+        var y;
+        console.log(x,y);
+    }
+    expect_stdout: "0 undefined"
+}
diff --git a/test/compress/properties.js b/test/compress/properties.js
index 0d50cdc3..a17fe690 100644
--- a/test/compress/properties.js
+++ b/test/compress/properties.js
@@ -1377,3 +1377,91 @@ const_prop_assign_pure: {
         x();
     }
 }
+
+join_object_assignments_1: {
+    options = {
+        evaluate: true,
+        join_vars: true,
+    }
+    input: {
+        console.log(function() {
+            var x = {
+                a: 1,
+                c: (console.log("c"), "C"),
+            };
+            x.b = 2;
+            x[3] = function() {
+                console.log(x);
+            },
+            x["a"] = /foo/,
+            x.bar = x;
+            return x;
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var x = {
+                a: 1,
+                c: (console.log("c"), "C"),
+                b: 2,
+                3: function() {
+                    console.log(x);
+                },
+                a: /foo/,
+            };
+            x.bar = x;
+            return x;
+        }());
+    }
+    expect_stdout: true
+}
+
+join_object_assignments_2: {
+    options = {
+        evaluate: true,
+        hoist_props: true,
+        join_vars: true,
+        passes: 3,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            foo: 1,
+        };
+        o.bar = 2;
+        o.baz = 3;
+        console.log(o.foo, o.bar + o.bar, o.foo * o.bar * o.baz);
+    }
+    expect: {
+        console.log(1, 4, 6);
+    }
+    expect_stdout: "1 4 6"
+}
+
+join_object_assignments_3: {
+    options = {
+        evaluate: true,
+        join_vars: true,
+    }
+    input: {
+        console.log(function() {
+            var o = {
+                a: "PASS",
+            }, a = o.a;
+            o.a = "FAIL";
+            return a;
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var o = {
+                a: "PASS",
+            }, a = o.a;
+            o.a = "FAIL";
+            return a;
+        }());
+    }
+    expect_stdout: "PASS"
+}
diff --git a/test/compress/reduce_vars.js b/test/compress/reduce_vars.js
index 6d711083..1d94e989 100644
--- a/test/compress/reduce_vars.js
+++ b/test/compress/reduce_vars.js
@@ -5866,3 +5866,29 @@ issue_2757_2: {
     ]
     node_version: ">=6"
 }
+
+issue_2774: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log({
+            get a() {
+                var b;
+                (b = true) && b.c;
+                b = void 0;
+            }
+        }.a);
+    }
+    expect: {
+        console.log({
+            get a() {
+                var b;
+                (b = true) && b.c;
+                b = void 0;
+            }
+        }.a);
+    }
+    expect_stdout: "undefined"
+}
diff --git a/test/mocha/minify.js b/test/mocha/minify.js
index e68ab2a2..b582c4d6 100644
--- a/test/mocha/minify.js
+++ b/test/mocha/minify.js
@@ -404,4 +404,18 @@ describe("minify", function() {
             assert.strictEqual(stat.print_to_string(), "a=x()");
         });
     });
+
+    describe("rename", function() {
+        it("Should be repeatable", function() {
+            var code = "!function(x){return x(x)}(y);";
+            for (var i = 0; i < 2; i++) {
+                assert.strictEqual(Uglify.minify(code, {
+                    compress: {
+                        toplevel: true,
+                    },
+                    rename: true,
+                }).code, "var a;(a=y)(a);");
+            }
+        });
+    });
 });