ons.slice(1));
                                continue;
                            }
                        }
                        if (self.body[i] instanceof AST_EmptyStatement) {
                            self.body.splice(i, 1);
                            continue;
                        }
                        if (self.body[i] instanceof AST_BlockStatement) {
                            var tmp = [ i, 1 ].concat(self.body[i].body);
                            self.body.splice.apply(self.body, tmp);
                            continue;
                        }
                        break;
                    }
                    defs = make_node(AST_Var, self, {
                        definitions: defs
                    });
                    hoisted.push(defs);
                };
            }
            self.body = dirs.concat(hoisted, self.body);
        }
        return self;
    });

    AST_Scope.DEFMETHOD("var_names", function() {
        var var_names = this._var_names;
        if (!var_names) {
            this._var_names = var_names = Object.create(null);
            this.enclosed.forEach(function(def) {
                var_names[def.name] = true;
            });
            this.variables.each(function(def, name) {
                var_names[name] = true;
            });
        }
        return var_names;
    });

    AST_Scope.DEFMETHOD("make_var_name", function(prefix) {
        var var_names = this.var_names();
        prefix = prefix.replace(/(?:^[^a-z_$]|[^a-z0-9_$])/ig, "_");
        var name = prefix;
        for (var i = 0; var_names[name]; i++) name = prefix + "$" + i;
        var_names[name] = true;
        return name;
    });

    AST_Scope.DEFMETHOD("hoist_properties", function(compressor){
        var self = this;
        if (!compressor.option("hoist_props") || compressor.has_directive("use asm")) return self;
        var top_retain = self instanceof AST_Toplevel && compressor.top_retain || return_false;
        var defs_by_id = Object.create(null);
        return self.transform(new TreeTransformer(function(node, descend) {
            if (node instanceof AST_VarDef) {
                var sym = node.name, def, value;
                if (sym.scope === self
                    && (def = sym.definition()).escaped != 1
                    && !def.assignments
                    && !def.direct_access
                    && !def.single_use
                    && !top_retain(def)
                    && (value = sym.fixed_value()) === node.value
                    && value instanceof AST_Object) {
                    descend(node, this);
                    var defs = new Dictionary();
                    var assignments = [];
                    value.properties.forEach(function(prop) {
                        assignments.push(make_node(AST_VarDef, node, {
                            name: make_sym(prop.key),
                            value: prop.value
                        }));
                    });
                    defs_by_id[def.id] = defs;
                    return MAP.splice(assignments);
                }
            }
            if (node instanceof AST_PropAccess && node.expression instanceof AST_SymbolRef) {
                var defs = defs_by_id[node.expression.definition().id];
                if (defs) {
                    var def = defs.get(get_value(node.property));
                    var sym = make_node(AST_SymbolRef, node, {
                        name: def.name,
                        scope: node.expression.scope,
                        thedef: def
                    });
                    sym.reference({});
                    return sym;
                }
            }

            function make_sym(key) {
                var new_var = make_node(sym.CTOR, sym, {
                    name: self.make_var_name(sym.name + "_" + key),
                    scope: self
                });
                var def = self.def_variable(new_var);
                defs.set(key, def);
                self.enclosed.push(def);
                return new_var;
            }
        }));
    });

    // drop_side_effect_free()
    // remove side-effect-free parts which only affects return value
    (function(def){
        // Drop side-effect-free elements from an array of expressions.
        // Returns an array of expressions with side-effects or null
        // if all elements were dropped. Note: original array may be
        // returned if nothing changed.
        function trim(nodes, compressor, first_in_statement) {
            var len = nodes.length;
            if (!len) return null;
            var ret = [], changed = false;
            for (var i = 0; i < len; i++) {
                var node = nodes[i].drop_side_effect_free(compressor, first_in_statement);
                changed |= node !== nodes[i];
                if (node) {
                    ret.push(node);
                    first_in_statement = false;
                }
            }
            return changed ? ret.length ? ret : null : nodes;
        }

        def(AST_Node, return_this);
        def(AST_Constant, return_null);
        def(AST_This, return_null);
        def(AST_Call, function(compressor, first_in_statement){
            if (!this.is_expr_pure(compressor)) {
                if (this.expression.is_call_pure(compressor)) {
                    var exprs = this.args.slice();
                    exprs.unshift(this.expression.expression);
                    exprs = trim(exprs, compressor, first_in_statement);
                    return exprs && make_sequence(this, exprs);
                }
                if (this.expression instanceof AST_Function
                    && (!this.expression.name || !this.expression.name.definition().references.length)) {
                    var node = this.clone();
                    var exp = node.expression;
                    exp.process_expression(false, compressor);
                    exp.walk(new TreeWalker(function(node) {
                        if (node instanceof AST_Return && node.value) {
                            node.value = node.value.drop_side_effect_free(compressor);
                            return true;
                        }
                        if (node instanceof AST_Scope && node !== exp) return true;
                    }));
                    return node;
                }
                return this;
            }
            if (this.pure) {
                compressor.warn("Dropping __PURE__ call [{file}:{line},{col}]", this.start);
            }
            var args = trim(this.args, compressor, first_in_statement);
            return args && make_sequence(this, args);
        });
        def(AST_Accessor, return_null);
        def(AST_Function, return_null);
        def(AST_Binary, function(compressor, first_in_statement){
            var right = this.right.drop_side_effect_free(compressor);
            if (!right) return this.left.drop_side_effect_free(compressor, first_in_statement);
            if (lazy_op[this.operator]) {
                if (right === this.right) return this;
                var node = this.clone();
                node.right = right;
                return node;
            } else {
                var left = this.left.drop_side_effect_free(compressor, first_in_statement);
                if (!left) return this.right.drop_side_effect_free(compressor, first_in_statement);
                return make_sequence(this, [ left, right ]);
            }
        });
        def(AST_Assign, function(compressor){
            var left = this.left;
            if (left.has_side_effects(compressor)
                || compressor.has_directive("use strict")
                    && left instanceof AST_PropAccess
                    && left.expression.is_constant()) {
                return this;
            }
            this.write_only = true;
            if (root_expr(left).is_constant_expression(compressor.find_parent(AST_Scope))) {
                return this.right.drop_side_effect_free(compressor);
            }
            return this;
        });
        def(AST_Conditional, function(compressor){
            var consequent = this.consequent.drop_side_effect_free(compressor);
            var alternative = this.alternative.drop_side_effect_free(compressor);
            if (consequent === this.consequent && alternative === this.alternative) return this;
            if (!consequent) return alternative ? make_node(AST_Binary, this, {
                operator: "||",
                left: this.condition,
                right: alternative
            }) : this.condition.drop_side_effect_free(compressor);
            if (!alternative) return make_node(AST_Binary, this, {
                operator: "&&",
                left: this.condition,
                right: consequent
            });
            var node = this.clone();
            node.consequent = consequent;
            node.alternative = alternative;
            return node;
        });
        def(AST_Unary, function(compressor, first_in_statement){
            if (unary_side_effects[this.operator]) {
                this.write_only = !this.expression.has_side_effects(compressor);
                return this;
            }
            if (this.operator == "typeof" && this.expression instanceof AST_SymbolRef) return null;
            var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
            if (first_in_statement && expression && is_iife_call(expression)) {
                if (expression === this.expression && this.operator == "!") return this;
                return expression.negate(compressor, first_in_statement);
            }
            return expression;
        });
        def(AST_SymbolRef, function(compressor) {
            return this.is_declared(compressor) ? null : this;
        });
        def(AST_Object, function(compressor, first_in_statement){
            var values = trim(this.properties, compressor, first_in_statement);
            return values && make_sequence(this, values);
        });
        def(AST_ObjectProperty, function(compressor, first_in_statement){
            return this.value.drop_side_effect_free(compressor, first_in_statement);
        });
        def(AST_Array, function(compressor, first_in_statement){
            var values = trim(this.elements, compressor, first_in_statement);
            return values && make_sequence(this, values);
        });
        def(AST_Dot, function(compressor, first_in_statement){
            if (this.expression.may_throw_on_access(compressor)) return this;
            return this.expression.drop_side_effect_free(compressor, first_in_statement);
        });
        def(AST_Sub, function(compressor, first_in_statement){
            if (this.expression.may_throw_on_access(compressor)) return this;
            var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
            if (!expression) return this.property.drop_side_effect_free(compressor, first_in_statement);
            var property = this.property.drop_side_effect_free(compressor);
            if (!property) return expression;
            return make_sequence(this, [ expression, property ]);
        });
        def(AST_Sequence, function(compressor){
            var last = this.tail_node();
            var expr = last.drop_side_effect_free(compressor);
            if (expr === last) return this;
            var expressions = this.expressions.slice(0, -1);
            if (expr) expressions.push(expr);
            return make_sequence(this, expressions);
        });
    })(function(node, func){
        node.DEFMETHOD("drop_side_effect_free", func);
    });

    OPT(AST_SimpleStatement, function(self, compressor){
        if (compressor.option("side_effects")) {
            var body = self.body;
            var node = body.drop_side_effect_free(compressor, true);
            if (!node) {
                compressor.warn("Dropping side-effect-free statement [{file}:{line},{col}]", self.start);
                return make_node(AST_EmptyStatement, self);
            }
            if (node !== body) {
                return make_node(AST_SimpleStatement, self, { body: node });
            }
        }
        return self;
    });

    OPT(AST_While, function(self, compressor){
        return compressor.option("loops") ? make_node(AST_For, self, self).optimize(compressor) : self;
    });

    OPT(AST_Do, function(self, compressor){
        if (!compressor.option("loops")) return self;
        var cond = self.condition.is_truthy() || self.condition.tail_node().evaluate(compressor);
        if (!(cond instanceof AST_Node)) {
            if (cond) return make_node(AST_For, self, {
                body: make_node(AST_BlockStatement, self.body, {
                    body: [
                        self.body,
                        make_node(AST_SimpleStatement, self.condition, {
                            body: self.condition
                        })
                    ]
                })
            }).optimize(compressor);
            var has_loop_control = false;
            var tw = new TreeWalker(function(node) {
                if (node instanceof AST_Scope || has_loop_control) return true;
                if (node instanceof AST_LoopControl && tw.loopcontrol_target(node) === self)
                    return has_loop_control = true;
            });
            var parent = compressor.parent();
            (parent instanceof AST_LabeledStatement ? parent : self).walk(tw);
            if (!has_loop_control) return make_node(AST_BlockStatement, self.body, {
                body: [
                    self.body,
                    make_node(AST_SimpleStatement, self.condition, {
                        body: self.condition
                    })
                ]
            }).optimize(compressor);
        }
        if (self.body instanceof AST_SimpleStatement) return make_node(AST_For, self, {
            condition: make_sequence(self.condition, [
                self.body.body,
                self.condition
            ]),
            body: make_node(AST_EmptyStatement, self)
        }).optimize(compressor);
        return self;
    });

    function 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 (is_break(first.body)) {
                if (self.condition) {
                    self.condition = make_node(AST_Binary, self.condition, {
                        left: self.condition,
                        operator: "&&",
                        right: first.condition.negate(compressor),
                    });
                } else {
                    self.condition = first.condition.negate(compressor);
                }
                drop_it(first.alternative);
            } else if (is_break(first.alternative)) {
                if (self.condition) {
                    self.condition = make_node(AST_Binary, self.condition, {
                        left: self.condition,
                        operator: "&&",
                        right: first.condition,
                    });
                } else {
                    self.condition = first.condition;
                }
                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;
        if (compressor.option("side_effects") && self.init) {
            self.init = self.init.drop_side_effect_free(compressor);
        }
        if (self.condition) {
            var cond = self.condition.evaluate(compressor);
            if (!(cond instanceof AST_Node)) {
                if (cond) self.condition = null;
                else if (!compressor.option("dead_code")) {
                    var orig = self.condition;
                    self.condition = make_node_from_constant(cond, self.condition);
                    self.condition = best_of_expression(self.condition.transform(compressor), orig);
                }
            }
            if (cond instanceof AST_Node) {
                cond = self.condition.is_truthy() || self.condition.tail_node().evaluate(compressor);
            }
            if (!cond) {
                if (compressor.option("dead_code")) {
                    var body = [];
                    extract_declarations_from_unreachable_code(compressor, self.body, 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
                        }));
                    }
                    body.push(make_node(AST_SimpleStatement, self.condition, {
                        body: self.condition
                    }));
                    return make_node(AST_BlockStatement, self, { body: body }).optimize(compressor);
                }
            } else if (self.condition && !(cond instanceof AST_Node)) {
                self.body = make_node(AST_BlockStatement, self.body, {
                    body: [
                        make_node(AST_SimpleStatement, self.condition, {
                            body: self.condition
                        }),
                        self.body
                    ]
                });
                self.condition = null;
            }
        }
        return if_break_in_loop(self, compressor);
    });

    OPT(AST_If, function(self, compressor){
        if (is_empty(self.alternative)) self.alternative = null;

        if (!compressor.option("conditionals")) return self;
        // if condition can be statically determined, warn and drop
        // one of the blocks.  note, statically determined implies
        // “has no side effects”; also it doesn't work for cases like
        // `x && true`, though it probably should.
        var cond = self.condition.evaluate(compressor);
        if (!compressor.option("dead_code") && !(cond instanceof AST_Node)) {
            var orig = self.condition;
            self.condition = make_node_from_constant(cond, orig);
            self.condition = best_of_expression(self.condition.transform(compressor), orig);
        }
        if (compressor.option("dead_code")) {
            if (cond instanceof AST_Node) {
                cond = self.condition.is_truthy() || self.condition.tail_node().evaluate(compressor);
            }
            if (!cond) {
                compressor.warn("Condition always false [{file}:{line},{col}]", self.condition.start);
                var body = [];
                extract_declarations_from_unreachable_code(compressor, self.body, body);
                body.push(make_node(AST_SimpleStatement, self.condition, {
                    body: self.condition
                }));
                if (self.alternative) body.push(self.alternative);
                return make_node(AST_BlockStatement, self, { body: body }).optimize(compressor);
            } else if (!(cond instanceof AST_Node)) {
                compressor.warn("Condition always true [{file}:{line},{col}]", self.condition.start);
                var body = [];
                if (self.alternative) {
                    extract_declarations_from_unreachable_code(compressor, self.alternative, body);
                }
                body.push(make_node(AST_SimpleStatement, self.condition, {
                    body: self.condition
                }));
                body.push(self.body);
                return make_node(AST_BlockStatement, self, { body: body }).optimize(compressor);
            }
        }
        var negated = self.condition.negate(compressor);
        var self_condition_length = self.condition.print_to_string().length;
        var negated_length = negated.print_to_string().length;
        var negated_is_best = negated_length < self_condition_length;
        if (self.alternative && negated_is_best) {
            negated_is_best = false; // because we already do the switch here.
            // no need to swap values of self_condition_length and negated_length
            // here because they are only used in an equality comparison later on.
            self.condition = negated;
            var tmp = self.body;
            self.body = self.alternative || make_node(AST_EmptyStatement, self);
            self.alternative = tmp;
        }
        if (is_empty(self.body) && is_empty(self.alternative)) {
            return make_node(AST_SimpleStatement, self.condition, {
                body: self.condition.clone()
            }).optimize(compressor);
        }
        if (self.body instanceof AST_SimpleStatement
            && self.alternative instanceof AST_SimpleStatement) {
            return make_node(AST_SimpleStatement, self, {
                body: make_node(AST_Conditional, self, {
                    condition   : self.condition,
                    consequent  : self.body.body,
                    alternative : self.alternative.body
                })
            }).optimize(compressor);
        }
        if (is_empty(self.alternative) && self.body instanceof AST_SimpleStatement) {
            if (self_condition_length === negated_length && !negated_is_best
                && self.condition instanceof AST_Binary && self.condition.operator == "||") {
                // although the code length of self.condition and negated are the same,
                // negated does not require additional surrounding parentheses.
                // see https://github.com/mishoo/UglifyJS2/issues/979
                negated_is_best = true;
            }
            if (negated_is_best) return make_node(AST_SimpleStatement, self, {
                body: make_node(AST_Binary, self, {
                    operator : "||",
                    left     : negated,
                    right    : self.body.body
                })
            }).optimize(compressor);
            return make_node(AST_SimpleStatement, self, {
                body: make_node(AST_Binary, self, {
                    operator : "&&",
                    left     : self.condition,
                    right    : self.body.body
                })
            }).optimize(compressor);
        }
        if (self.body instanceof AST_EmptyStatement
            && self.alternative instanceof AST_SimpleStatement) {
            return make_node(AST_SimpleStatement, self, {
                body: make_node(AST_Binary, self, {
                    operator : "||",
                    left     : self.condition,
                    right    : self.alternative.body
                })
            }).optimize(compressor);
        }
        if (self.body instanceof AST_Exit
            && self.alternative instanceof AST_Exit
            && self.body.TYPE == self.alternative.TYPE) {
            return make_node(self.body.CTOR, self, {
                value: make_node(AST_Conditional, self, {
                    condition   : self.condition,
                    consequent  : self.body.value || make_node(AST_Undefined, self.body),
                    alternative : self.alternative.value || make_node(AST_Undefined, self.alternative)
                }).transform(compressor)
            }).optimize(compressor);
        }
        if (self.body instanceof AST_If
            && !self.body.alternative
            && !self.alternative) {
            self = make_node(AST_If, self, {
                condition: make_node(AST_Binary, self.condition, {
                    operator: "&&",
                    left: self.condition,
                    right: self.body.condition
                }),
                body: self.body.body,
                alternative: null
            });
        }
        if (aborts(self.body)) {
            if (self.alternative) {
                var alt = self.alternative;
                self.alternative = null;
                return make_node(AST_BlockStatement, self, {
                    body: [ self, alt ]
                }).optimize(compressor);
            }
        }
        if (aborts(self.alternative)) {
            var body = self.body;
            self.body = self.alternative;
            self.condition = negated_is_best ? negated : self.condition.negate(compressor);
            self.alternative = null;
            return make_node(AST_BlockStatement, self, {
                body: [ self, body ]
            }).optimize(compressor);
        }
        return self;
    });

    OPT(AST_Switch, function(self, compressor){
        if (!compressor.option("switches")) return self;
        var branch;
        var value = self.expression.evaluate(compressor);
        if (!(value instanceof AST_Node)) {
            var orig = self.expression;
            self.expression = make_node_from_constant(value, orig);
            self.expression = best_of_expression(self.expression.transform(compressor), orig);
        }
        if (!compressor.option("dead_code")) return self;
        if (value instanceof AST_Node) {
            value = self.expression.tail_node().evaluate(compressor);
        }
        var decl = [];
        var body = [];
        var default_branch;
        var exact_match;
        for (var i = 0, len = self.body.length; i < len && !exact_match; i++) {
            branch = self.body[i];
            if (branch instanceof AST_Default) {
                if (!default_branch) {
                    default_branch = branch;
                } else {
                    eliminate_branch(branch, body[body.length - 1]);
                }
            } else if (!(value instanceof AST_Node)) {
                var exp = branch.expression.evaluate(compressor);
                if (!(exp instanceof AST_Node) && exp !== value) {
                    eliminate_branch(branch, body[body.length - 1]);
                    continue;
                }
                if (exp instanceof AST_Node) exp = branch.expression.tail_node().evaluate(compressor);
                if (exp === value) {
                    exact_match = branch;
                    if (default_branch) {
                        var default_index = body.indexOf(default_branch);
                        body.splice(default_index, 1);
                        eliminate_branch(default_branch, body[default_index - 1]);
                        default_branch = null;
                    }
                }
            }
            if (aborts(branch)) {
                var prev = body[body.length - 1];
                if (aborts(prev) && prev.body.length == branch.body.length
                    && make_node(AST_BlockStatement, prev, prev).equivalent_to(make_node(AST_BlockStatement, branch, branch))) {
                    prev.body = [];
                }
            }
            body.push(branch);
        }
        while (i < len) eliminate_branch(self.body[i++], body[body.length - 1]);
        if (body.length > 0) {
            body[0].body = decl.concat(body[0].body);
        }
        self.body = body;
        while (branch = body[body.length - 1]) {
            var stat = branch.body[branch.body.length - 1];
            if (stat instanceof AST_Break && compressor.loopcontrol_target(stat) === self)
                branch.body.pop();
            if (branch.body.length || branch instanceof AST_Case
                && (default_branch || branch.expression.has_side_effects(compressor))) break;
            if (body.pop() === default_branch) default_branch = null;
        }
        if (body.length == 0) {
            return make_node(AST_BlockStatement, self, {
                body: decl.concat(make_node(AST_SimpleStatement, self.expression, {
                    body: self.expression
                }))
            }).optimize(compressor);
        }
        if (body.length == 1 && (body[0] === exact_match || body[0] === default_branch)) {
            var has_break = false;
            var tw = new TreeWalker(function(node) {
                if (has_break
                    || node instanceof AST_Lambda
                    || node instanceof AST_SimpleStatement) return true;
                if (node instanceof AST_Break && tw.loopcontrol_target(node) === self)
                    has_break = true;
            });
            self.walk(tw);
            if (!has_break) {
                var statements = body[0].body.slice();
                var exp = body[0].expression;
                if (exp) statements.unshift(make_node(AST_SimpleStatement, exp, {
                    body: exp
                }));
                statements.unshift(make_node(AST_SimpleStatement, self.expression, {
                    body:self.expression
                }));
                return make_node(AST_BlockStatement, self, {
                    body: statements
                }).optimize(compressor);
            }
        }
        return self;

        function eliminate_branch(branch, prev) {
            if (prev && !aborts(prev)) {
                prev.body = prev.body.concat(branch.body);
            } else {
                extract_declarations_from_unreachable_code(compressor, branch, decl);
            }
        }
    });

    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 (compressor.option("dead_code") && all(self.body, is_empty)) {
            var 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
            }).optimize(compressor);
        }
        return self;
    });

    AST_Definitions.DEFMETHOD("remove_initializers", function(){
        this.definitions.forEach(function(def){ def.value = null });
    });

    AST_Definitions.DEFMETHOD("to_assignments", function(compressor){
        var reduce_vars = compressor.option("reduce_vars");
        var assignments = this.definitions.reduce(function(a, def){
            if (def.value) {
                var name = make_node(AST_SymbolRef, def.name, def.name);
                a.push(make_node(AST_Assign, def, {
                    operator : "=",
                    left     : name,
                    right    : def.value
                }));
                if (reduce_vars) name.definition().fixed = false;
            }
            def = def.name.definition();
            def.eliminated++;
            def.replaced--;
            return a;
        }, []);
        if (assignments.length == 0) return null;
        return make_sequence(this, assignments);
    });

    OPT(AST_Definitions, function(self, compressor){
        if (self.definitions.length == 0)
            return make_node(AST_EmptyStatement, self);
        return self;
    });

    OPT(AST_Call, function(self, compressor){
        var exp = self.expression;
        var fn = exp;
        if (compressor.option("reduce_vars") && fn instanceof AST_SymbolRef) {
            fn = fn.fixed_value();
        }
        var is_func = fn instanceof AST_Lambda;
        if (compressor.option("unused")
            && is_func
            && !fn.uses_arguments
            && !fn.uses_eval) {
            var pos = 0, last = 0;
            for (var i = 0, len = self.args.length; i < len; i++) {
                var trim = i >= fn.argnames.length;
                if (trim || fn.argnames[i].__unused) {
                    var node = self.args[i].drop_side_effect_free(compressor);
                    if (node) {
                        self.args[pos++] = node;
                    } else if (!trim) {
                        self.args[pos++] = make_node(AST_Number, self.args[i], {
                            value: 0
                        });
                        continue;
                    }
                } else {
                    self.args[pos++] = self.args[i];
                }
                last = pos;
            }
            self.args.length = last;
        }
        if (compressor.option("unsafe")) {
            if (is_undeclared_ref(exp)) switch (exp.name) {
              case "Array":
                if (self.args.length != 1) {
                    return make_node(AST_Array, self, {
                        elements: self.args
                    }).optimize(compressor);
                }
                break;
              case "Object":
                if (self.args.length == 0) {
                    return make_node(AST_Object, self, {
                        properties: []
                    });
                }
                break;
              case "String":
                if (self.args.length == 0) return make_node(AST_String, self, {
                    value: ""
                });
                if (self.args.length <= 1) return make_node(AST_Binary, self, {
                    left: self.args[0],
                    operator: "+",
                    right: make_node(AST_String, self, { value: "" })
                }).optimize(compressor);
                break;
              case "Number":
                if (self.args.length == 0) return make_node(AST_Number, self, {
                    value: 0
                });
                if (self.args.length == 1) return make_node(AST_UnaryPrefix, self, {
                    expression: self.args[0],
                    operator: "+"
                }).optimize(compressor);
              case "Boolean":
                if (self.args.length == 0) return make_node(AST_False, self);
                if (self.args.length == 1) return make_node(AST_UnaryPrefix, self, {
                    expression: make_node(AST_UnaryPrefix, self, {
                        expression: self.args[0],
                        operator: "!"
                    }),
                    operator: "!"
                }).optimize(compressor);
                break;
              case "RegExp":
                var params = [];
                if (all(self.args, function(arg) {
                    var value = arg.evaluate(compressor);
                    params.unshift(value);
                    return arg !== value;
                })) {
                    try {
                        return best_of(compressor, self, make_node(AST_RegExp, self, {
                            value: RegExp.apply(RegExp, params),
                        }));
                    } catch (ex) {
                        compressor.warn("Error converting {expr} [{file}:{line},{col}]", {
                            expr: self.print_to_string(),
                            file: self.start.file,
                            line: self.start.line,
                            col: self.start.col
                        });
                    }
                }
                break;
            } else if (exp instanceof AST_Dot) switch(exp.property) {
              case "toString":
                if (self.args.length == 0 && !exp.expression.may_throw_on_access(compressor)) {
                    return make_node(AST_Binary, self, {
                        left: make_node(AST_String, self, { value: "" }),
                        operator: "+",
                        right: exp.expression
                    }).optimize(compressor);
                }
                break;
              case "join":
                if (exp.expression instanceof AST_Array) EXIT: {
                    var separator;
                    if (self.args.length > 0) {
                        separator = self.args[0].evaluate(compressor);
                        if (separator === self.args[0]) break EXIT; // not a constant
                    }
                    var elements = [];
                    var consts = [];
                    exp.expression.elements.forEach(function(el) {
                        var value = el.evaluate(compressor);
                        if (value !== el) {
                            consts.push(value);
                        } else {
                            if (consts.length > 0) {
                                elements.push(make_node(AST_String, self, {
                                    value: consts.join(separator)
                                }));
                                consts.length = 0;
                            }
                            elements.push(el);
                        }
                    });
                    if (consts.length > 0) {
                        elements.push(make_node(AST_String, self, {
                            value: consts.join(separator)
                        }));
                    }
                    if (elements.length == 0) return make_node(AST_String, self, { value: "" });
                    if (elements.length == 1) {
                        if (elements[0].is_string(compressor)) {
                            return elements[0];
                        }
                        return make_node(AST_Binary, elements[0], {
                            operator : "+",
                            left     : make_node(AST_String, self, { value: "" }),
                            right    : elements[0]
                        });
                    }
                    if (separator == "") {
                        var first;
                        if (elements[0].is_string(compressor)
                            || elements[1].is_string(compressor)) {
                            first = elements.shift();
                        } else {
                            first = make_node(AST_String, self, { value: "" });
                        }
                        return elements.reduce(function(prev, el){
                            return make_node(AST_Binary, el, {
                                operator : "+",
                                left     : prev,
                                right    : el
                            });
                        }, first).optimize(compressor);
                    }
                    // need this awkward cloning to not affect original element
                    // best_of will decide which one to get through.
                    var node = self.clone();
                    node.expression = node.expression.clone();
                    node.expression.expression = node.expression.expression.clone();
                    node.expression.expression.elements = elements;
                    return best_of(compressor, self, node);
                }
                break;
              case "charAt":
                if (exp.expression.is_string(compressor)) {
                    var arg = self.args[0];
                    var index = arg ? arg.evaluate(compressor) : 0;
                    if (index !== arg) {
                        return make_node(AST_Sub, exp, {
                            expression: exp.expression,
                            property: make_node_from_constant(index | 0, arg || exp)
                        }).optimize(compressor);
                    }
                }
                break;
              case "apply":
                if (self.args.length == 2 && self.args[1] instanceof AST_Array) {
                    var args = self.args[1].elements.slice();
                    args.unshift(self.args[0]);
                    return make_node(AST_Call, self, {
                        expression: make_node(AST_Dot, exp, {
                            expression: exp.expression,
                            property: "call"
                        }),
                        args: args
                    }).optimize(compressor);
                }
                break;
              case "call":
                var func = exp.expression;
                if (func instanceof AST_SymbolRef) {
                    func = func.fixed_value();
                }
                if (func instanceof AST_Lambda && !func.contains_this()) {
                    return make_sequence(this, [
                        self.args[0],
                        make_node(AST_Call, self, {
                            expression: exp.expression,
                            args: self.args.slice(1)
                        })
                    ]).optimize(compressor);
                }
                break;
            }
        }
        if (compressor.option("unsafe_Function")
            && is_undeclared_ref(exp)
            && exp.name == "Function") {
            // new Function() => function(){}
            if (self.args.length == 0) return make_node(AST_Function, self, {
                argnames: [],
                body: []
            });
            if (all(self.args, function(x) {
                return x instanceof AST_String;
            })) {
                // quite a corner-case, but we can handle it:
                //   https://github.com/mishoo/UglifyJS2/issues/203
                // if the code argument is a constant, then we can minify it.
                try {
                    var code = "n(function(" + self.args.slice(0, -1).map(function(arg) {
                        return arg.value;
                    }).join(",") + "){" + self.args[self.args.length - 1].value + "})";
                    var ast = parse(code);
                    var mangle = { ie8: compressor.option("ie8") };
                    ast.figure_out_scope(mangle);
                    var comp = new Compressor(compressor.options);
                    ast = ast.transform(comp);
                    ast.figure_out_scope(mangle);
                    ast.compute_char_frequency(mangle);
                    ast.mangle_names(mangle);
                    var fun;
                    ast.walk(new TreeWalker(function(node) {
                        if (fun) return true;
                        if (node instanceof AST_Lambda) {
                            fun = node;
                            return true;
                        }
                    }));
                    var code = OutputStream();
                    AST_BlockStatement.prototype._codegen.call(fun, fun, code);
                    self.args = [
                        make_node(AST_String, self, {
                            value: fun.argnames.map(function(arg) {
                                return arg.print_to_string();
                            }).join(",")
                        }),
                        make_node(AST_String, self.args[self.args.length - 1], {
                            value: code.get().replace(/^\{|\}$/g, "")
                        })
                    ];
                    return self;
                } catch (ex) {
                    if (ex instanceof JS_Parse_Error) {
                        compressor.warn("Error parsing code passed to new Function [{file}:{line},{col}]", self.args[self.args.length - 1].start);
                        compressor.warn(ex.toString());
                    } else {
                        throw ex;
                    }
                }
            }
        }
        var stat = is_func && fn.body[0];
        if (compressor.option("inline") && stat instanceof AST_Return) {
            var value = stat.value;
            if (!value || value.is_constant_expression()) {
                if (value) {
                    value = value.clone(true);
                } else {
                    value = make_node(AST_Undefined, self);
                }
                var args = self.args.concat(value);
                return make_sequence(self, args).optimize(compressor);
            }
        }
        if (is_func) {
            var def, value, scope, in_loop, level = -1;
            if (compressor.option("inline")
                && !fn.uses_arguments
                && !fn.uses_eval
                && !(fn.name && fn instanceof AST_Function)
                && (value = can_flatten_body(stat))
                && (exp === fn
                    || compressor.option("unused")
                        && (def = exp.definition()).references.length == 1
                        && !recursive_ref(compressor, def)
                        && fn.is_constant_expression(exp.scope))
                && !self.pure
                && !fn.contains_this()
                && can_inject_symbols()) {
                fn._squeezed = true;
                return make_sequence(self, flatten_fn()).optimize(compressor);
            }
            if (compressor.option("side_effects") && all(fn.body, is_empty)) {
                var args = self.args.concat(make_node(AST_Undefined, self));
                return make_sequence(self, args).optimize(compressor);
            }
        }
        if (compressor.option("drop_console")) {
            if (exp instanceof AST_PropAccess) {
                var name = exp.expression;
                while (name.expression) {
                    name = name.expression;
                }
                if (is_undeclared_ref(name) && name.name == "console") {
                    return make_node(AST_Undefined, self).optimize(compressor);
                }
            }
        }
        if (compressor.option("negate_iife")
            && compressor.parent() instanceof AST_SimpleStatement
            && is_iife_call(self)) {
            return self.negate(compressor, true);
        }
        var ev = self.evaluate(compressor);
        if (ev !== self) {
            ev = make_node_from_constant(ev, self).optimize(compressor);
            return best_of(compressor, ev, self);
        }
        return self;

        function return_value(stat) {
            if (!stat) return make_node(AST_Undefined, self);
            if (stat instanceof AST_Return) {
                if (!stat.value) return make_node(AST_Undefined, self);
                return stat.value.clone(true);
            }
            if (stat instanceof AST_SimpleStatement) {
                return make_node(AST_UnaryPrefix, stat, {
                    operator: "void",
                    expression: stat.body.clone(true)
                });
            }
        }

        function can_flatten_body(stat) {
            var len = fn.body.length;
            if (compressor.option("inline") < 3) {
                return len == 1 && return_value(stat);
            }
            stat = null;
            for (var i = 0; i < len; i++) {
                var line = fn.body[i];
                if (line instanceof AST_Var) {
                    if (stat && !all(line.definitions, function(var_def) {
                        return !var_def.value;
                    })) {
                        return false;
                    }
                } else if (line instanceof AST_EmptyStatement) {
                    continue;
                } else if (stat) {
                    return false;
                } else {
                    stat = line;
                }
            }
            return return_value(stat);
        }

        function can_inject_args(catches, safe_to_inject) {
            for (var i = 0, len = fn.argnames.length; i < len; i++) {
                var arg = fn.argnames[i];
                if (arg.__unused) continue;
                if (!safe_to_inject
                    || catches[arg.name]
                    || identifier_atom[arg.name]
                    || scope.var_names()[arg.name]) {
                    return false;
                }
                if (in_loop) in_loop.push(arg.definition());
            }
            return true;
        }

        function can_inject_vars(catches, safe_to_inject) {
            var len = fn.body.length;
            for (var i = 0; i < len; i++) {
                var stat = fn.body[i];
                if (!(stat instanceof AST_Var)) continue;
                if (!safe_to_inject) return false;
                for (var j = stat.definitions.length; --j >= 0;) {
                    var name = stat.definitions[j].name;
                    if (catches[name.name]
                        || identifier_atom[name.name]
                        || scope.var_names()[name.name]) {
                        return false;
                    }
                    if (in_loop) in_loop.push(name.definition());
                }
            }
            return true;
        }

        function can_inject_symbols() {
            var catches = Object.create(null);
            do {
                scope = compressor.parent(++level);
                if (scope instanceof AST_Catch) {
                    catches[scope.argname.name] = true;
                } else if (scope instanceof AST_IterationStatement) {
                    in_loop = [];
                } else if (scope instanceof AST_SymbolRef) {
                    if (scope.fixed_value() instanceof AST_Scope) return false;
                }
            } while (!(scope instanceof AST_Scope));
            var safe_to_inject = !(scope instanceof AST_Toplevel) || compressor.toplevel.vars;
            var inline = compressor.option("inline");
            if (!can_inject_vars(catches, inline >= 3 && safe_to_inject)) return false;
            if (!can_inject_args(catches, inline >= 2 && safe_to_inject)) return false;
            return !in_loop || in_loop.length == 0 || !is_reachable(fn, in_loop);
        }

        function append_var(decls, expressions, name, value) {
            var def = name.definition();
            scope.variables.set(name.name, def);
            scope.enclosed.push(def);
            if (!scope.var_names()[name.name]) {
                scope.var_names()[name.name] = true;
                decls.push(make_node(AST_VarDef, name, {
                    name: name,
                    value: null
                }));
            }
            var sym = make_node(AST_SymbolRef, name, name);
            def.references.push(sym);
            if (value) expressions.push(make_node(AST_Assign, self, {
                operator: "=",
                left: sym,
                right: value
            }));
        }

        function flatten_args(decls, expressions) {
            var len = fn.argnames.length;
            for (var i = self.args.length; --i >= len;) {
                expressions.push(self.args[i]);
            }
            for (i = len; --i >= 0;) {
                var name = fn.argnames[i];
                var value = self.args[i];
                if (name.__unused || scope.var_names()[name.name]) {
                    if (value) expressions.push(value);
                } else {
                    var symbol = make_node(AST_SymbolVar, name, name);
                    name.definition().orig.push(symbol);
                    if (!value && in_loop) value = make_node(AST_Undefined, self);
                    append_var(decls, expressions, symbol, value);
                }
            }
            decls.reverse();
            expressions.reverse();
        }

        function flatten_vars(decls, expressions) {
            var pos = expressions.length;
            for (var i = 0, lines = fn.body.length; i < lines; i++) {
                var stat = fn.body[i];
                if (!(stat instanceof AST_Var)) continue;
                for (var j = 0, defs = stat.definitions.length; j < defs; j++) {
                    var var_def = stat.definitions[j];
                    var name = var_def.name;
                    append_var(decls, expressions, name, var_def.value);
                    if (in_loop && all(fn.argnames, function(argname) {
                        return argname.name != name.name;
                    })) {
                        var def = fn.variables.get(name.name);
                        var sym = make_node(AST_SymbolRef, name, name);
                        def.references.push(sym);
                        expressions.splice(pos++, 0, make_node(AST_Assign, var_def, {
                            operator: "=",
                            left: sym,
                            right: make_node(AST_Undefined, name)
                        }));
                    }
                }
            }
        }

        function flatten_fn() {
            var decls = [];
            var expressions = [];
            flatten_args(decls, expressions);
            flatten_vars(decls, expressions);
            expressions.push(value);
            if (decls.length) {
                i = scope.body.indexOf(compressor.parent(level - 1)) + 1;
                scope.body.splice(i, 0, make_node(AST_Var, fn, {
                    definitions: decls
                }));
            }
            return expressions;
        }
    });

    OPT(AST_New, function(self, compressor){
        if (compressor.option("unsafe")) {
            var exp = self.expression;
            if (is_undeclared_ref(exp)) {
                switch (exp.name) {
                  case "Object":
                  case "RegExp":
                  case "Function":
                  case "Error":
                  case "Array":
                    return make_node(AST_Call, self, self).transform(compressor);
                }
            }
        }
        return self;
    });

    OPT(AST_Sequence, function(self, compressor){
        if (!compressor.option("side_effects")) return self;
        var expressions = [];
        filter_for_side_effects();
        var end = expressions.length - 1;
        trim_right_for_undefined();
        if (end == 0) {
            self = maintain_this_binding(compressor.parent(), compressor.self(), expressions[0]);
            if (!(self instanceof AST_Sequence)) self = self.optimize(compressor);
            return self;
        }
        self.expressions = expressions;
        return self;

        function filter_for_side_effects() {
            var first = first_in_statement(compressor);
            var last = self.expressions.length - 1;
            self.expressions.forEach(function(expr, index) {
                if (index < last) expr = expr.drop_side_effect_free(compressor, first);
                if (expr) {
                    merge_sequence(expressions, expr);
                    first = false;
                }
            });
        }

        function trim_right_for_undefined() {
            while (end > 0 && is_undefined(expressions[end], compressor)) end--;
            if (end < expressions.length - 1) {
                expressions[end] = make_node(AST_UnaryPrefix, self, {
                    operator   : "void",
                    expression : expressions[end]
                });
                expressions.length = end + 1;
            }
        }
    });

    AST_Unary.DEFMETHOD("lift_sequences", function(compressor){
        if (compressor.option("sequences")) {
            if (this.expression instanceof AST_Sequence) {
                var x = this.expression.expressions.slice();
                var e = this.clone();
                e.expression = x.pop();
                x.push(e);
                return make_sequence(this, x).optimize(compressor);
            }
        }
        return this;
    });

    OPT(AST_UnaryPostfix, function(self, compressor){
        return self.lift_sequences(compressor);
    });

    OPT(AST_UnaryPrefix, function(self, compressor){
        var e = self.expression;
        if (self.operator == "delete"
            && !(e instanceof AST_SymbolRef
                || e instanceof AST_PropAccess
                || is_identifier_atom(e))) {
            if (e instanceof AST_Sequence) {
                e = e.expressions.slice();
                e.push(make_node(AST_True, self));
                return make_sequence(self, e).optimize(compressor);
            }
            return make_sequence(self, [ e, make_node(AST_True, self) ]).optimize(compressor);
        }
        var seq = self.lift_sequences(compressor);
        if (seq !== self) {
            return seq;
        }
        if (compressor.option("side_effects") && self.operator == "void") {
            e = e.drop_side_effect_free(compressor);
            if (e) {
                self.expression = e;
                return self;
            } else {
                return make_node(AST_Undefined, self).optimize(compressor);
            }
        }
        if (compressor.option("booleans")) {
            if (self.operator == "!" && e.is_truthy()) {
                return make_sequence(self, [ e, make_node(AST_False, self) ]).optimize(compressor);
            } else if (compressor.in_boolean_context()) switch (self.operator) {
              case "!":
                if (e instanceof AST_UnaryPrefix && e.operator == "!") {
                    // !!foo ==> foo, if we're in boolean context
                    return e.expression;
                }
                if (e instanceof AST_Binary) {
                    self = best_of(compressor, self, e.negate(compressor, first_in_statement(compressor)));
                }
                break;
              case "typeof":
                // typeof always returns a non-empty string, thus it's
                // always true in booleans
                compressor.warn("Boolean expression always true [{file}:{line},{col}]", self.start);
                return (e instanceof AST_SymbolRef ? make_node(AST_True, self) : make_sequence(self, [
                    e,
                    make_node(AST_True, self)
                ])).optimize(compressor);
            }
        }
        if (self.operator == "-" && e instanceof AST_Infinity) {
            e = e.transform(compressor);
        }
        if (e instanceof AST_Binary
            && (self.operator == "+" || self.operator == "-")
            && (e.operator == "*" || e.operator == "/" || e.operator == "%")) {
            return make_node(AST_Binary, self, {
                operator: e.operator,
                left: make_node(AST_UnaryPrefix, e.left, {
                    operator: self.operator,
                    expression: e.left
                }),
                right: e.right
            });
        }
        // avoids infinite recursion of numerals
        if (self.operator != "-"
            || !(e instanceof AST_Number || e instanceof AST_Infinity)) {
            var ev = self.evaluate(compressor);
            if (ev !== self) {
                ev = make_node_from_constant(ev, self).optimize(compressor);
                return best_of(compressor, ev, self);
            }
        }
        return self;
    });

    AST_Binary.DEFMETHOD("lift_sequences", function(compressor){
        if (compressor.option("sequences")) {
            if (this.left instanceof AST_Sequence) {
                var x = this.left.expressions.slice();
                var e = this.clone();
                e.left = x.pop();
                x.push(e);
                return make_sequence(this, x).optimize(compressor);
            }
            if (this.right instanceof AST_Sequence && !this.left.has_side_effects(compressor)) {
                var assign = this.operator == "=" && this.left instanceof AST_SymbolRef;
                var x = this.right.expressions;
                var last = x.length - 1;
                for (var i = 0; i < last; i++) {
                    if (!assign && x[i].has_side_effects(compressor)) break;
                }
                if (i == last) {
                    x = x.slice();
                    var e = this.clone();
                    e.right = x.pop();
                    x.push(e);
                    return make_sequence(this, x).optimize(compressor);
                } else if (i > 0) {
                    var e = this.clone();
                    e.right = make_sequence(this.right, x.slice(i));
                    x = x.slice(0, i);
                    x.push(e);
                    return make_sequence(this, x).optimize(compressor);
                }
            }
        }
        return this;
    });

    var commutativeOperators = makePredicate("== === != !== * & | ^");
    function is_object(node) {
        return node instanceof AST_Array
            || node instanceof AST_Lambda
            || node instanceof AST_Object;
    }

    OPT(AST_Binary, function(self, compressor){
        function reversible() {
            return self.left.is_constant()
                || self.right.is_constant()
                || !self.left.has_side_effects(compressor)
                    && !self.right.has_side_effects(compressor);
        }
        function reverse(op) {
            if (reversible()) {
                if (op) self.operator = op;
                var tmp = self.left;
                self.left = self.right;
                self.right = tmp;
            }
        }
        if (commutativeOperators[self.operator]) {
            if (self.right.is_constant()
                && !self.left.is_constant()) {
                // if right is a constant, whatever side effects the
                // left side might have could not influence the
                // result.  hence, force switch.

                if (!(self.left instanceof AST_Binary
                      && PRECEDENCE[self.left.operator] >= PRECEDENCE[self.operator])) {
                    reverse();
                }
            }
        }
        self = self.lift_sequences(compressor);
        if (compressor.option("comparisons")) switch (self.operator) {
          case "===":
          case "!==":
            var is_strict_comparison = true;
            if ((self.left.is_string(compressor) && self.right.is_string(compressor)) ||
                (self.left.is_number(compressor) && self.right.is_number(compressor)) ||
                (self.left.is_boolean() && self.right.is_boolean()) ||
                self.left.equivalent_to(self.right)) {
                self.operator = self.operator.substr(0, 2);
            }
            // XXX: intentionally falling down to the next case
          case "==":
          case "!=":
            // void 0 == x => null == x
            if (!is_strict_comparison && is_undefined(self.left, compressor)) {
                self.left = make_node(AST_Null, self.left);
            }
            // "undefined" == typeof x => undefined === x
            else if (compressor.option("typeofs")
                && self.left instanceof AST_String
                && self.left.value == "undefined"
                && self.right instanceof AST_UnaryPrefix
                && self.right.operator == "typeof") {
                var expr = self.right.expression;
                if (expr instanceof AST_SymbolRef ? expr.is_declared(compressor)
                    : !(expr instanceof AST_PropAccess && compressor.option("ie8"))) {
                    self.right = expr;
                    self.left = make_node(AST_Undefined, self.left).optimize(compressor);
                    if (self.operator.length == 2) self.operator += "=";
                }
            }
            // obj !== obj => false
            else if (self.left instanceof AST_SymbolRef
                && self.right instanceof AST_SymbolRef
                && self.left.definition() === self.right.definition()
                && is_object(self.left.fixed_value())) {
                return make_node(self.operator[0] == "=" ? AST_True : AST_False, self);
            }
            break;
          case "&&":
          case "||":
            var lhs = self.left;
            if (lhs.operator == self.operator) {
                lhs = lhs.right;
            }
            if (lhs instanceof AST_Binary
                && lhs.operator == (self.operator == "&&" ? "!==" : "===")
                && self.right instanceof AST_Binary
                && lhs.operator == self.right.operator
                && (is_undefined(lhs.left, compressor) && self.right.left instanceof AST_Null
                    || lhs.left instanceof AST_Null && is_undefined(self.right.left, compressor))
                && !lhs.right.has_side_effects(compressor)
                && lhs.right.equivalent_to(self.right.right)) {
                var combined = make_node(AST_Binary, self, {
                    operator: lhs.operator.slice(0, -1),
                    left: make_node(AST_Null, self),
                    right: lhs.right
                });
                if (lhs !== self.left) {
                    combined = make_node(AST_Binary, self, {
                        operator: self.operator,
                        left: self.left.left,
                        right: combined
                    });
                }
                return combined;
            }
            break;
        }
        if (compressor.option("booleans") && self.operator == "+" && compressor.in_boolean_context()) {
            var ll = self.left.evaluate(compressor);
            var rr = self.right.evaluate(compressor);
            if (ll && typeof ll == "string") {
                compressor.warn("+ in boolean context always true [{file}:{line},{col}]", self.start);
                return make_sequence(self, [
                    self.right,
                    make_node(AST_True, self)
                ]).optimize(compressor);
            }
            if (rr && typeof rr == "string") {
                compressor.warn("+ in boolean context always true [{file}:{line},{col}]", self.start);
                return make_sequence(self, [
                    self.left,
                    make_node(AST_True, self)
                ]).optimize(compressor);
            }
        }
        if (compressor.option("comparisons") && self.is_boolean()) {
            if (!(compressor.parent() instanceof AST_Binary)
                || compressor.parent() instanceof AST_Assign) {
                var negated = make_node(AST_UnaryPrefix, self, {
                    operator: "!",
                    expression: self.negate(compressor, first_in_statement(compressor))
                });
                self = best_of(compressor, self, negated);
            }
            switch (self.operator) {
              case ">": reverse("<"); break;
              case ">=": reverse("<="); break;
            }
        }
        if (self.operator == "+") {
            if (self.right instanceof AST_String
                && self.right.getValue() == ""
                && self.left.is_string(compressor)) {
                return self.left;
            }
            if (self.left instanceof AST_String
                && self.left.getValue() == ""
                && self.right.is_string(compressor)) {
                return self.right;
            }
            if (self.left instanceof AST_Binary
                && self.left.operator == "+"
                && self.left.left instanceof AST_String
                && self.left.left.getValue() == ""
                && self.right.is_string(compressor)) {
                self.left = self.left.right;
                return self.transform(compressor);
            }
        }
        if (compressor.option("evaluate")) {
            switch (self.operator) {
              case "&&":
                var ll = fuzzy_eval(self.left);
                if (!ll) {
                    compressor.warn("Condition left of && always false [{file}:{line},{col}]", self.start);
                    return maintain_this_binding(compressor.parent(), compressor.self(), self.left).optimize(compressor);
                } else if (!(ll instanceof AST_Node)) {
                    compressor.warn("Condition left of && always true [{file}:{line},{col}]", self.start);
                    return make_sequence(self, [ self.left, self.right ]).optimize(compressor);
                }
                var rr = self.right.evaluate(compressor);
                if (!rr) {
                    if (compressor.option("booleans") && compressor.in_boolean_context()) {
                        compressor.warn("Boolean && always false [{file}:{line},{col}]", self.start);
                        return make_sequence(self, [
                            self.left,
                            make_node(AST_False, self)
                        ]).optimize(compressor);
                    } else self.falsy = true;
                } else if (!(rr instanceof AST_Node)) {
                    var parent = compressor.parent();
                    if (parent.operator == "&&" && parent.left === compressor.self()
                        || compressor.option("booleans") && compressor.in_boolean_context()) {
                        compressor.warn("Dropping side-effect-free && [{file}:{line},{col}]", self.start);
                        return self.left.optimize(compressor);
                    }
                }
                // x || false && y ---> x ? y : false
                if (self.left.operator == "||") {
                    var lr = self.left.right.evaluate(compressor);
                    if (!lr) return make_node(AST_Conditional, self, {
                        condition: self.left.left,
                        consequent: self.right,
                        alternative: self.left.right
                    }).optimize(compressor);
                }
                break;
              case "||":
                var ll = fuzzy_eval(self.left);
                if (!ll) {
                    compressor.warn("Condition left of || always false [{file}:{line},{col}]", self.start);
                    return make_sequence(self, [ self.left, self.right ]).optimize(compressor);
                } else if (!(ll instanceof AST_Node)) {
                    compressor.warn("Condition left of || always true [{file}:{line},{col}]", self.start);
                    return maintain_this_binding(compressor.parent(), compressor.self(), self.left).optimize(compressor);
                }
                var rr = self.right.evaluate(compressor);
                if (!rr) {
                    var parent = compressor.parent();
                    if (parent.operator == "||" && parent.left === compressor.self()
                        || compressor.option("booleans") && compressor.in_boolean_context()) {
                        compressor.warn("Dropping side-effect-free || [{file}:{line},{col}]", self.start);
                        return self.left.optimize(compressor);
                    }
                } else if (!(rr instanceof AST_Node)) {
                    if (compressor.option("booleans") && compressor.in_boolean_context()) {
                        compressor.warn("Boolean || always true [{file}:{line},{col}]", self.start);
                        return make_sequence(self, [
                            self.left,
                            make_node(AST_True, self)
                        ]).optimize(compressor);
                    } else self.truthy = true;
                }
                if (self.left.operator == "&&") {
                    var lr = self.left.right.evaluate(compressor);
                    if (lr && !(lr instanceof AST_Node)) return make_node(AST_Conditional, self, {
                        condition: self.left.left,
                        consequent: self.left.right,
                        alternative: self.right
                    }).optimize(compressor);
                }
                break;
            }
            var associative = true;
            switch (self.operator) {
              case "+":
                // "foo" + ("bar" + x) => "foobar" + x
                if (self.left instanceof AST_Constant
                    && self.right instanceof AST_Binary
                    && self.right.operator == "+"
                    && self.right.left instanceof AST_Constant
                    && self.right.is_string(compressor)) {
                    self = make_node(AST_Binary, self, {
                        operator: "+",
                        left: make_node(AST_String, self.left, {
                            value: "" + self.left.getValue() + self.right.left.getValue(),
                            start: self.left.start,
                            end: self.right.left.end
                        }),
                        right: self.right.right
                    });
                }
                // (x + "foo") + "bar" => x + "foobar"
                if (self.right instanceof AST_Constant
                    && self.left instanceof AST_Binary
                    && self.left.operator == "+"
                    && self.left.right instanceof AST_Constant
                    && self.left.is_string(compressor)) {
                    self = make_node(AST_Binary, self, {
                        operator: "+",
                        left: self.left.left,
                        right: make_node(AST_String, self.right, {
                            value: "" + self.left.right.getValue() + self.right.getValue(),
                            start: self.left.right.start,
                            end: self.right.end
                        })
                    });
                }
                // (x + "foo") + ("bar" + y) => (x + "foobar") + y
                if (self.left instanceof AST_Binary
                    && self.left.operator == "+"
                    && self.left.is_string(compressor)
                    && self.left.right instanceof AST_Constant
                    && self.right instanceof AST_Binary
                    && self.right.operator == "+"
                    && self.right.left instanceof AST_Constant
                    && self.right.is_string(compressor)) {
                    self = make_node(AST_Binary, self, {
                        operator: "+",
                        left: make_node(AST_Binary, self.left, {
                            operator: "+",
                            left: self.left.left,
                            right: make_node(AST_String, self.left.right, {
                                value: "" + self.left.right.getValue() + self.right.left.getValue(),
                                start: self.left.right.start,
                                end: self.right.left.end
                            })
                        }),
                        right: self.right.right
                    });
                }
                // a + -b => a - b
                if (self.right instanceof AST_UnaryPrefix
                    && self.right.operator == "-"
                    && self.left.is_number(compressor)) {
                    self = make_node(AST_Binary, self, {
                        operator: "-",
                        left: self.left,
                        right: self.right.expression
                    });
                    break;
                }
                // -a + b => b - a
                if (self.left instanceof AST_UnaryPrefix
                    && self.left.operator == "-"
                    && reversible()
                    && self.right.is_number(compressor)) {
                    self = make_node(AST_Binary, self, {
                        operator: "-",
                        left: self.right,
                        right: self.left.expression
                    });
                    break;
                }
              case "*":
                associative = compressor.option("unsafe_math");
              case "&":
              case "|":
              case "^":
                // a + +b => +b + a
                if (self.left.is_number(compressor)
                    && self.right.is_number(compressor)
                    && reversible()
                    && !(self.left instanceof AST_Binary
                        && self.left.operator != self.operator
                        && PRECEDENCE[self.left.operator] >= PRECEDENCE[self.operator])) {
                    var reversed = make_node(AST_Binary, self, {
                        operator: self.operator,
                        left: self.right,
                        right: self.left
                    });
                    if (self.right instanceof AST_Constant
                        && !(self.left instanceof AST_Constant)) {
                        self = best_of(compressor, reversed, self);
                    } else {
                        self = best_of(compressor, self, reversed);
                    }
                }
                if (associative && self.is_number(compressor)) {
                    // a + (b + c) => (a + b) + c
                    if (self.right instanceof AST_Binary
                        && self.right.operator == self.operator) {
                        self = make_node(AST_Binary, self, {
                            operator: self.operator,
                            left: make_node(AST_Binary, self.left, {
                                operator: self.operator,
                                left: self.left,
                                right: self.right.left,
                                start: self.left.start,
                                end: self.right.left.end
                            }),
                            right: self.right.right
                        });
                    }
                    // (n + 2) + 3 => 5 + n
                    // (2 * n) * 3 => 6 + n
                    if (self.right instanceof AST_Constant
                        && self.left instanceof AST_Binary
                        && self.left.operator == self.operator) {
                        if (self.left.left instanceof AST_Constant) {
                            self = make_node(AST_Binary, self, {
                                operator: self.operator,
                                left: make_node(AST_Binary, self.left, {
                                    operator: self.operator,
                                    left: self.left.left,
                                    right: self.right,
                                    start: self.left.left.start,
                                    end: self.right.end
                                }),
                                right: self.left.right
                            });
                        } else if (self.left.right instanceof AST_Constant) {
                            self = make_node(AST_Binary, self, {
                                operator: self.operator,
                                left: make_node(AST_Binary, self.left, {
                                    operator: self.operator,
                                    left: self.left.right,
                                    right: self.right,
                                    start: self.left.right.start,
                                    end: self.right.end
                                }),
                                right: self.left.left
                            });
                        }
                    }
                    // (a | 1) | (2 | d) => (3 | a) | b
                    if (self.left instanceof AST_Binary
                        && self.left.operator == self.operator
                        && self.left.right instanceof AST_Constant
                        && self.right instanceof AST_Binary
                        && self.right.operator == self.operator
                        && self.right.left instanceof AST_Constant) {
                        self = make_node(AST_Binary, self, {
                            operator: self.operator,
                            left: make_node(AST_Binary, self.left, {
                                operator: self.operator,
                                left: make_node(AST_Binary, self.left.left, {
                                    operator: self.operator,
                                    left: self.left.right,
                                    right: self.right.left,
                                    start: self.left.right.start,
                                    end: self.right.left.end
                                }),
                                right: self.left.left
                            }),
                            right: self.right.right
                        });
                    }
                }
            }
        }
        // x && (y && z)  ==>  x && y && z
        // x || (y || z)  ==>  x || y || z
        // x + ("y" + z)  ==>  x + "y" + z
        // "x" + (y + "z")==>  "x" + y + "z"
        if (self.right instanceof AST_Binary
            && self.right.operator == self.operator
            && (lazy_op[self.operator]
                || (self.operator == "+"
                    && (self.right.left.is_string(compressor)
                        || (self.left.is_string(compressor)
                            && self.right.right.is_string(compressor))))))
        {
            self.left = make_node(AST_Binary, self.left, {
                operator : self.operator,
                left     : self.left,
                right    : self.right.left
            });
            self.right = self.right.right;
            return self.transform(compressor);
        }
        var ev = self.evaluate(compressor);
        if (ev !== self) {
            ev = make_node_from_constant(ev, self).optimize(compressor);
            return best_of(compressor, ev, self);
        }
        return self;

        function fuzzy_eval(node) {
            if (node.truthy) return true;
            if (node.falsy) return false;
            if (node.is_truthy()) return true;
            return node.evaluate(compressor);
        }
    });

    function recursive_ref(compressor, def) {
        var node;
        for (var i = 0; node = compressor.parent(i); i++) {
            if (node instanceof AST_Lambda) {
                var name = node.name;
                if (name && name.definition() === def) break;
            }
        }
        return node;
    }

    OPT(AST_SymbolRef, function(self, compressor){
        var def = self.resolve_defines(compressor);
        if (def) {
            return def.optimize(compressor);
        }
        // testing against !self.scope.uses_with first is an optimization
        if (!compressor.option("ie8")
            && is_undeclared_ref(self)
            && (!self.scope.uses_with || !compressor.find_parent(AST_With))) {
            switch (self.name) {
              case "undefined":
                return make_node(AST_Undefined, self).optimize(compressor);
              case "NaN":
                return make_node(AST_NaN, self).optimize(compressor);
              case "Infinity":
                return make_node(AST_Infinity, self).optimize(compressor);
            }
        }
        if (compressor.option("reduce_vars")
            && is_lhs(self, compressor.parent()) !== self) {
            var d = self.definition();
            var fixed = self.fixed_value();
            var single_use = d.single_use;
            if (single_use && fixed instanceof AST_Lambda) {
                if (d.scope !== self.scope
                    && (!compressor.option("reduce_funcs")
                        || d.escaped == 1
                        || fixed.inlined)) {
                    single_use = false;
                } else if (recursive_ref(compressor, d)) {
                    single_use = false;
                } else if (d.scope !== self.scope || d.orig[0] instanceof AST_SymbolFunarg) {
                    single_use = fixed.is_constant_expression(self.scope);
                    if (single_use == "f") {
                        var scope = self.scope;
                        do {
                            if (scope instanceof AST_Defun || scope instanceof AST_Function) {
                                scope.inlined = true;
                            }
                        } while (scope = scope.parent_scope);
                    }
                }
            }
            if (single_use && fixed) {
                if (fixed instanceof AST_Defun) {
                    fixed._squeezed = true;
                    fixed = make_node(AST_Function, fixed, fixed);
                }
                var value;
                if (d.recursive_refs > 0 && fixed.name instanceof AST_SymbolDefun) {
                    value = fixed.clone(true);
                    var defun_def = value.name.definition();
                    var lambda_def = value.variables.get(value.name.name);
                    var name = lambda_def && lambda_def.orig[0];
                    if (!(name instanceof AST_SymbolLambda)) {
                        name = make_node(AST_SymbolLambda, value.name, value.name);
                        name.scope = value;
                        value.name = name;
                        lambda_def = value.def_function(name);
                    }
                    value.walk(new TreeWalker(function(node) {
                        if (node instanceof AST_SymbolRef && node.definition() === defun_def) {
                            node.thedef = lambda_def;
                            lambda_def.references.push(node);
                        }
                    }));
                } else {
                    value = fixed.optimize(compressor);
                    if (value === fixed) value = fixed.clone(true);
                }
                return value;
            }
            if (fixed && d.should_replace === undefined) {
                var init;
                if (fixed instanceof AST_This) {
                    if (!(d.orig[0] instanceof AST_SymbolFunarg)
                        && all(d.references, function(ref) {
                            return d.scope === ref.scope;
                        })) {
                        init = fixed;
                    }
                } else {
                    var ev = fixed.evaluate(compressor);
                    if (ev !== fixed && (compressor.option("unsafe_regexp") || !(ev instanceof RegExp))) {
                        init = make_node_from_constant(ev, fixed);
                    }
                }
                if (init) {
                    var value_length = init.optimize(compressor).print_to_string().length;
                    var fn;
                    if (has_symbol_ref(fixed)) {
                        fn = function() {
                            var result = init.optimize(compressor);
                            return result === init ? result.clone(true) : result;
                        };
                    } else {
                        value_length = Math.min(value_length, fixed.print_to_string().length);
                        fn = function() {
                            var result = best_of_expression(init.optimize(compressor), fixed);
                            return result === init || result === fixed ? result.clone(true) : result;
                        };
                    }
                    var name_length = d.name.length;
                    var overhead = 0;
                    if (compressor.option("unused") && !compressor.exposed(d)) {
                        overhead = (name_length + 2 + value_length) / (d.references.length - d.assignments);
                    }
                    d.should_replace = value_length <= name_length + overhead ? fn : false;
                } else {
                    d.should_replace = false;
                }
            }
            if (d.should_replace) {
                return d.should_replace();
            }
        }
        return self;

        function has_symbol_ref(value) {
            var found;
            value.walk(new TreeWalker(function(node) {
                if (node instanceof AST_SymbolRef) found = true;
                if (found) return true;
            }));
            return found;
        }
    });

    function is_atomic(lhs, self) {
        return lhs instanceof AST_SymbolRef || lhs.TYPE === self.TYPE;
    }

    OPT(AST_Undefined, function(self, compressor){
        if (compressor.option("unsafe_undefined")) {
            var undef = find_variable(compressor, "undefined");
            if (undef) {
                var ref = make_node(AST_SymbolRef, self, {
                    name   : "undefined",
                    scope  : undef.scope,
                    thedef : undef
                });
                ref.is_undefined = true;
                return ref;
            }
        }
        var lhs = is_lhs(compressor.self(), compressor.parent());
        if (lhs && is_atomic(lhs, self)) return self;
        return make_node(AST_UnaryPrefix, self, {
            operator: "void",
            expression: make_node(AST_Number, self, {
                value: 0
            })
        });
    });

    OPT(AST_Infinity, function(self, compressor){
        var lhs = is_lhs(compressor.self(), compressor.parent());
        if (lhs && is_atomic(lhs, self)) return self;
        if (compressor.option("keep_infinity")
            && !(lhs && !is_atomic(lhs, self))
            && !find_variable(compressor, "Infinity"))
            return self;
        return make_node(AST_Binary, self, {
            operator: "/",
            left: make_node(AST_Number, self, {
                value: 1
            }),
            right: make_node(AST_Number, self, {
                value: 0
            })
        });
    });

    OPT(AST_NaN, function(self, compressor){
        var lhs = is_lhs(compressor.self(), compressor.parent());
        if (lhs && !is_atomic(lhs, self)
            || find_variable(compressor, "NaN")) {
            return make_node(AST_Binary, self, {
                operator: "/",
                left: make_node(AST_Number, self, {
                    value: 0
                }),
                right: make_node(AST_Number, self, {
                    value: 0
                })
            });
        }
        return self;
    });

    function is_reachable(self, defs) {
        var reachable = false;
        var find_ref = new TreeWalker(function(node) {
            if (reachable) return true;
            if (node instanceof AST_SymbolRef && member(node.definition(), defs)) {
                return reachable = true;
            }
        });
        var scan_scope = new TreeWalker(function(node) {
            if (reachable) return true;
            if (node instanceof AST_Scope && node !== self) {
                var parent = scan_scope.parent();
                if (parent instanceof AST_Call && parent.expression === node) return;
                node.walk(find_ref);
                return true;
            }
        });
        self.walk(scan_scope);
        return reachable;
    }

    var ASSIGN_OPS = makePredicate("+ - / * % >> << >>> | ^ &");
    var ASSIGN_OPS_COMMUTATIVE = makePredicate("* | ^ &");
    OPT(AST_Assign, function(self, compressor){
        var def;
        if (compressor.option("dead_code")
            && self.left instanceof AST_SymbolRef
            && (def = self.left.definition()).scope === compressor.find_parent(AST_Lambda)) {
            var level = 0, node, parent = self;
            do {
                node = parent;
                parent = compressor.parent(level++);
                if (parent instanceof AST_Exit) {
                    if (in_try(level, parent)) break;
                    if (is_reachable(def.scope, [ def ])) break;
                    if (self.operator == "=") return self.right;
                    def.fixed = false;
                    return make_node(AST_Binary, self, {
                        operator: self.operator.slice(0, -1),
                        left: self.left,
                        right: self.right
                    }).optimize(compressor);
                }
            } while (parent instanceof AST_Binary && parent.right === node
                || parent instanceof AST_Sequence && parent.tail_node() === node);
        }
        self = self.lift_sequences(compressor);
        if (self.operator == "=" && self.left instanceof AST_SymbolRef && self.right instanceof AST_Binary) {
            // x = expr1 OP expr2
            if (self.right.left instanceof AST_SymbolRef
                && self.right.left.name == self.left.name
                && ASSIGN_OPS[self.right.operator]) {
                // x = x - 2  --->  x -= 2
                self.operator = self.right.operator + "=";
                self.right = self.right.right;
            }
            else if (self.right.right instanceof AST_SymbolRef
                && self.right.right.name == self.left.name
                && ASSIGN_OPS_COMMUTATIVE[self.right.operator]
                && !self.right.left.has_side_effects(compressor)) {
                // x = 2 & x  --->  x &= 2
                self.operator = self.right.operator + "=";
                self.right = self.right.left;
            }
        }
        return self;

        function in_try(level, node) {
            var right = self.right;
            self.right = make_node(AST_Null, right);
            var may_throw = node.may_throw(compressor);
            self.right = right;
            var scope = self.left.definition().scope;
            var parent;
            while ((parent = compressor.parent(level++)) !== scope) {
                if (parent instanceof AST_Try) {
                    if (parent.bfinally) return true;
                    if (may_throw && parent.bcatch) return true;
                }
            }
        }
    });

    OPT(AST_Conditional, function(self, compressor){
        if (!compressor.option("conditionals")) return self;
        // This looks like lift_sequences(), should probably be under "sequences"
        if (self.condition instanceof AST_Sequence) {
            var expressions = self.condition.expressions.slice();
            self.condition = expressions.pop();
            expressions.push(self);
            return make_sequence(self, expressions);
        }
        var cond = self.condition.is_truthy() || self.condition.tail_node().evaluate(compressor);
        if (!cond) {
            compressor.warn("Condition always false [{file}:{line},{col}]", self.start);
            return make_sequence(self, [ self.condition, self.alternative ]).optimize(compressor);
        } else if (!(cond instanceof AST_Node)) {
            compressor.warn("Condition always true [{file}:{line},{col}]", self.start);
            return make_sequence(self, [ self.condition, self.consequent ]).optimize(compressor);
        }
        var negated = cond.negate(compressor, first_in_statement(compressor));
        if (best_of(compressor, cond, negated) === negated) {
            self = make_node(AST_Conditional, self, {
                condition: negated,
                consequent: self.alternative,
                alternative: self.consequent
            });
        }
        var condition = self.condition;
        var consequent = self.consequent;
        var alternative = self.alternative;
        // x?x:y --> x||y
        if (condition instanceof AST_SymbolRef
            && consequent instanceof AST_SymbolRef
            && condition.definition() === consequent.definition()) {
            return make_node(AST_Binary, self, {
                operator: "||",
                left: condition,
                right: alternative
            });
        }
        // if (foo) exp = something; else exp = something_else;
        //                   |
        //                   v
        // exp = foo ? something : something_else;
        if (consequent instanceof AST_Assign
            && alternative instanceof AST_Assign
            && consequent.operator == alternative.operator
            && consequent.left.equivalent_to(alternative.left)
            && (!self.condition.has_side_effects(compressor)
                || consequent.operator == "="
                    && !consequent.left.has_side_effects(compressor))) {
            return make_node(AST_Assign, self, {
                operator: consequent.operator,
                left: consequent.left,
                right: make_node(AST_Conditional, self, {
                    condition: self.condition,
                    consequent: consequent.right,
                    alternative: alternative.right
                })
            });
        }
        // x ? y(a) : y(b) --> y(x ? a : b)
        var arg_index;
        if (consequent instanceof AST_Call
            && alternative.TYPE === consequent.TYPE
            && consequent.args.length > 0
            && consequent.args.length == alternative.args.length
            && consequent.expression.equivalent_to(alternative.expression)
            && !self.condition.has_side_effects(compressor)
            && !consequent.expression.has_side_effects(compressor)
            && typeof (arg_index = single_arg_diff()) == "number") {
            var node = consequent.clone();
            node.args[arg_index] = make_node(AST_Conditional, self, {
                condition: self.condition,
                consequent: consequent.args[arg_index],
                alternative: alternative.args[arg_index]
            });
            return node;
        }
        // x?y?z:a:a --> x&&y?z:a
        if (consequent instanceof AST_Conditional
            && consequent.alternative.equivalent_to(alternative)) {
            return make_node(AST_Conditional, self, {
                condition: make_node(AST_Binary, self, {
                    left: self.condition,
                    operator: "&&",
                    right: consequent.condition
                }),
                consequent: consequent.consequent,
                alternative: alternative
            });
        }
        // x ? y : y --> x, y
        if (consequent.equivalent_to(alternative)) {
            return make_sequence(self, [
                self.condition,
                consequent
            ]).optimize(compressor);
        }
        // x ? (y, w) : (z, w) --> x ? y : z, w
        if ((consequent instanceof AST_Sequence || alternative instanceof AST_Sequence)
            && consequent.tail_node().equivalent_to(alternative.tail_node())) {
            return make_sequence(self, [
                make_node(AST_Conditional, self, {
                    condition: self.condition,
                    consequent: pop_seq(consequent),
                    alternative: pop_seq(alternative)
                }),
                consequent.tail_node()
            ]).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.option("booleans") && compressor.in_boolean_context();
        if (is_true(self.consequent)) {
            if (is_false(self.alternative)) {
                // c ? true : false ---> !!c
                return booleanize(self.condition);
            }
            // c ? true : x ---> !!c || x
            return make_node(AST_Binary, self, {
                operator: "||",
                left: booleanize(self.condition),
                right: self.alternative
            });
        }
        if (is_false(self.consequent)) {
            if (is_true(self.alternative)) {
                // c ? false : true ---> !c
                return booleanize(self.condition.negate(compressor));
            }
            // c ? false : x ---> !c && x
            return make_node(AST_Binary, self, {
                operator: "&&",
                left: booleanize(self.condition.negate(compressor)),
                right: self.alternative
            });
        }
        if (is_true(self.alternative)) {
            // c ? x : true ---> !c || x
            return make_node(AST_Binary, self, {
                operator: "||",
                left: booleanize(self.condition.negate(compressor)),
                right: self.consequent
            });
        }
        if (is_false(self.alternative)) {
            // c ? x : false ---> !!c && x
            return make_node(AST_Binary, self, {
                operator: "&&",
                left: booleanize(self.condition),
                right: self.consequent
            });
        }

        return self;

        function booleanize(node) {
            if (node.is_boolean()) return node;
            // !!expression
            return make_node(AST_UnaryPrefix, node, {
                operator: "!",
                expression: node.negate(compressor)
            });
        }

        // AST_True or !0
        function is_true(node) {
            return node instanceof AST_True
                || in_bool
                    && node instanceof AST_Constant
                    && node.getValue()
                || (node instanceof AST_UnaryPrefix
                    && node.operator == "!"
                    && node.expression instanceof AST_Constant
                    && !node.expression.getValue());
        }
        // AST_False or !1
        function is_false(node) {
            return node instanceof AST_False
                || in_bool
                    && node instanceof AST_Constant
                    && !node.getValue()
                || (node instanceof AST_UnaryPrefix
                    && node.operator == "!"
                    && node.expression instanceof AST_Constant
                    && node.expression.getValue());
        }

        function single_arg_diff() {
            var a = consequent.args;
            var b = alternative.args;
            for (var i = 0, len = a.length; i < len; i++) {
                if (!a[i].equivalent_to(b[i])) {
                    for (var j = i + 1; j < len; j++) {
                        if (!a[j].equivalent_to(b[j])) return;
                    }
                    return i;
                }
            }
        }

        function pop_seq(node) {
            if (!(node instanceof AST_Sequence)) return make_node(AST_Number, node, {
                value: 0
            });
            return make_sequence(node, node.expressions.slice(0, -1));
        }
    });

    OPT(AST_Boolean, function(self, compressor){
        if (!compressor.option("booleans")) return self;
        if (compressor.in_boolean_context()) return make_node(AST_Number, self, {
            value: +self.value
        });
        var p = compressor.parent();
        if (p instanceof AST_Binary && (p.operator == "==" || p.operator == "!=")) {
            compressor.warn("Non-strict equality against boolean: {operator} {value} [{file}:{line},{col}]", {
                operator : p.operator,
                value    : self.value,
                file     : p.start.file,
                line     : p.start.line,
                col      : p.start.col,
            });
            return make_node(AST_Number, self, {
                value: +self.value
            });
        }
        return make_node(AST_UnaryPrefix, self, {
            operator: "!",
            expression: make_node(AST_Number, self, {
                value: 1 - self.value
            })
        });
    });

    OPT(AST_Sub, function(self, compressor){
        var expr = self.expression;
        var prop = self.property;
        if (compressor.option("properties")) {
            var key = prop.evaluate(compressor);
            if (key !== prop) {
                if (typeof key == "string") {
                    if (key == "undefined") {
                        key = undefined;
                    } else {
                        var value = parseFloat(key);
                        if (value.toString() == key) {
                            key = value;
                        }
                    }
                }
                prop = self.property = best_of_expression(prop, make_node_from_constant(key, prop).transform(compressor));
                var property = "" + key;
                if (is_identifier_string(property)
                    && property.length <= prop.print_to_string().length + 1) {
                    return make_node(AST_Dot, self, {
                        expression: expr,
                        property: property
                    }).optimize(compressor);
                }
            }
        }
        if (is_lhs(self, compressor.parent())) return self;
        if (key !== prop) {
            var sub = self.flatten_object(property, compressor);
            if (sub) {
                expr = self.expression = sub.expression;
                prop = self.property = sub.property;
            }
        }
        if (compressor.option("properties") && compressor.option("side_effects")
            && prop instanceof AST_Number && expr instanceof AST_Array) {
            var index = prop.getValue();
            var elements = expr.elements;
            if (index in elements) {
                var flatten = true;
                var values = [];
                for (var i = elements.length; --i > index;) {
                    var value = elements[i].drop_side_effect_free(compressor);
                    if (value) {
                        values.unshift(value);
                        if (flatten && value.has_side_effects(compressor)) flatten = false;
                    }
                }
                var retValue = elements[index];
                retValue = retValue instanceof AST_Hole ? make_node(AST_Undefined, retValue) : retValue;
                if (!flatten) values.unshift(retValue);
                while (--i >= 0) {
                    var value = elements[i].drop_side_effect_free(compressor);
                    if (value) values.unshift(value);
                    else index--;
                }
                if (flatten) {
                    values.push(retValue);
                    return make_sequence(self, values).optimize(compressor);
                } else return make_node(AST_Sub, self, {
                    expression: make_node(AST_Array, expr, {
                        elements: values
                    }),
                    property: make_node(AST_Number, prop, {
                        value: index
                    })
                });
            }
        }
        var fn;
        if (compressor.option("arguments")
            && expr instanceof AST_SymbolRef
            && expr.name == "arguments"
            && expr.definition().orig.length == 1
            && (fn = expr.scope) instanceof AST_Lambda
            && prop instanceof AST_Number) {
            var index = prop.getValue();
            var argname = fn.argnames[index];
            if (!argname && !compressor.option("keep_fargs")) {
                while (index >= fn.argnames.length) {
                    argname = make_node(AST_SymbolFunarg, fn, {
                        name: fn.make_var_name("argument_" + fn.argnames.length),
                        scope: fn
                    });
                    fn.argnames.push(argname);
                    fn.enclosed.push(fn.def_variable(argname));
                }
            }
            if (argname) {
                var sym = make_node(AST_SymbolRef, self, argname);
                sym.reference({});
                return sym;
            }
        }
        var ev = self.evaluate(compressor);
        if (ev !== self) {
            ev = make_node_from_constant(ev, self).optimize(compressor);
            return best_of(compressor, ev, self);
        }
        return self;
    });

    AST_Lambda.DEFMETHOD("contains_this", function() {
        var result;
        var self = this;
        self.walk(new TreeWalker(function(node) {
            if (result) return true;
            if (node instanceof AST_This) return result = true;
            if (node !== self && node instanceof AST_Scope) return true;
        }));
        return result;
    });

    AST_PropAccess.DEFMETHOD("flatten_object", function(key, compressor) {
        if (!compressor.option("properties")) return;
        var expr = this.expression;
        if (expr instanceof AST_Object) {
            var props = expr.properties;
            for (var i = props.length; --i >= 0;) {
                var prop = props[i];
                if ("" + prop.key == key) {
                    if (!all(props, function(prop) {
                        return prop instanceof AST_ObjectKeyVal;
                    })) break;
                    var value = prop.value;
                    if (value instanceof AST_Function
                        && !(compressor.parent() instanceof AST_New)
                        && value.contains_this()) break;
                    return make_node(AST_Sub, this, {
                        expression: make_node(AST_Array, expr, {
                            elements: props.map(function(prop) {
                                return prop.value;
                            })
                        }),
                        property: make_node(AST_Number, this, {
                            value: i
                        })
                    });
                }
            }
        }
    });

    OPT(AST_Dot, function(self, compressor){
        if (self.property == "arguments" || self.property == "caller") {
            compressor.warn("Function.protoype.{prop} not supported [{file}:{line},{col}]", {
                prop: self.property,
                file: self.start.file,
                line: self.start.line,
                col: self.start.col
            });
        }
        var def = self.resolve_defines(compressor);
        if (def) {
            return def.optimize(compressor);
        }
        if (is_lhs(self, compressor.parent())) return self;
        if (compressor.option("unsafe_proto")
            && self.expression instanceof AST_Dot
            && self.expression.property == "prototype") {
            var exp = self.expression.expression;
            if (is_undeclared_ref(exp)) switch (exp.name) {
              case "Array":
                self.expression = make_node(AST_Array, self.expression, {
                    elements: []
                });
                break;
              case "Function":
                self.expression = make_node(AST_Function, self.expression, {
                    argnames: [],
                    body: []
                });
                break;
              case "Number":
                self.expression = make_node(AST_Number, self.expression, {
                    value: 0
                });
                break;
              case "Object":
                self.expression = make_node(AST_Object, self.expression, {
                    properties: []
                });
                break;
              case "RegExp":
                self.expression = make_node(AST_RegExp, self.expression, {
                    value: /t/
                });
                break;
              case "String":
                self.expression = make_node(AST_String, self.expression, {
                    value: ""
                });
                break;
            }
        }
        var sub = self.flatten_object(self.property, compressor);
        if (sub) return sub.optimize(compressor);
        var ev = self.evaluate(compressor);
        if (ev !== self) {
            ev = make_node_from_constant(ev, self).optimize(compressor);
            return best_of(compressor, ev, self);
        }
        return self;
    });

    OPT(AST_Return, function(self, compressor){
        if (self.value && is_undefined(self.value, compressor)) {
            self.value = null;
        }
        return self;
    });

    OPT(AST_VarDef, function(self, compressor){
        var defines = compressor.option("global_defs");
        if (defines && HOP(defines, self.name.name)) {
            compressor.warn('global_defs ' + self.name.name + ' redefined [{file}:{line},{col}]', self.start);
        }
        return self;
    });

})();
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