Merge pull request #1624 from alexlamsl/harmony-v2.8.14

Merging from master for 2.8.14

README.md

@@ -68,7 +68,8 @@ The available options are:
   --source-map-inline           Write base64-encoded source map to the end of js output.
   --in-source-map               Input source map, useful if you're compressing
                                 JS that was generated from some other original
-                                code.
+                                code. Specify "inline" if the source map is included
+                                inline with the sources.
   --screw-ie8                   Use this flag if you don't wish to support
                                 Internet Explorer 6/7/8.
                                 By default UglifyJS will not try to be IE-proof.
@@ -200,9 +201,10 @@ compressed JS by mapping every token in the compiled JS to its original
 location.
 
 To use this feature you need to pass `--in-source-map
-/path/to/input/source.map`.  Normally the input source map should also point
-to the file containing the generated JS, so if that's correct you can omit
-input files from the command line.
+/path/to/input/source.map` or `--in-source-map inline` if the source map is
+included inline with the sources. Normally the input source map should also
+point to the file containing the generated JS, so if that's correct you can
+omit input files from the command line.
 
 ## Mangler options
 

lib/ast.js

@@ -814,9 +814,6 @@ var AST_VarDef = DEFNODE("VarDef", "name value", {
         name: "[AST_SymbolVar|AST_SymbolConst|AST_Destructuring] name of the variable",
         value: "[AST_Node?] initializer, or null of there's no initializer"
     },
-    is_destructuring: function() {
-        return this.name instanceof AST_Destructuring;
-    },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
             this.name._walk(visitor);
@@ -1323,11 +1320,13 @@ TreeWalker.prototype = {
     push: function (node) {
         if (node instanceof AST_Lambda) {
             this.directives = Object.create(this.directives);
-        } else if (node instanceof AST_Directive) {
-            this.directives[node.value] = this.directives[node.value] ? "up" : true;
+        } else if (node instanceof AST_Directive && !this.directives[node.value]) {
+            this.directives[node.value] = node;
         } else if (node instanceof AST_Class) {
             this.directives = Object.create(this.directives);
-            this.directives["use strict"] = this.directives["use strict"] ? "up" : true;
+            if (!this.directives["use strict"]) {
+                this.directives["use strict"] = node;
+            }
         }
         this.stack.push(node);
     },
@@ -1355,7 +1354,7 @@ TreeWalker.prototype = {
             for (var i = 0; i < node.body.length; ++i) {
                 var st = node.body[i];
                 if (!(st instanceof AST_Directive)) break;
-                if (st.value == type) return true;
+                if (st.value == type) return st;
             }
         }
     },

lib/parse.js

@@ -1998,7 +1998,6 @@ function parse($TEXT, options) {
                 // allow trailing comma
                 break;
             start = S.token;
-            var type = start.type;
             var name = as_property_name();
             var value;
 
@@ -2009,9 +2008,6 @@ function parse($TEXT, options) {
                     a.push(concise);
                     continue;
                 }
-                if (!(start.type !== name)) {
-                    unexpected(S.token);
-                }
 
                 value = new AST_SymbolRef({
                     start: prev(),

lib/scope.js

@@ -279,7 +279,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             if (node instanceof AST_SymbolCatch) {
                 var name = node.name;
                 var refs = node.thedef.references;
-                var scope = node.thedef.scope.parent_scope;
+                var scope = node.thedef.scope.parent_scope.parent_scope;
                 var def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
                 refs.forEach(function(ref) {
                     ref.thedef = def;

lib/utils.js

@@ -126,9 +126,11 @@ function merge(obj, ext) {
     return count;
 };
 
-function noop() {};
+function noop() {}
 function return_false() { return false; }
 function return_true() { return true; }
+function return_this() { return this; }
+function return_null() { return null; }
 
 var MAP = (function(){
     function MAP(a, f, backwards) {

package.json

@@ -4,7 +4,7 @@
   "homepage": "http://lisperator.net/uglifyjs",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "2.8.11",
+  "version": "2.8.14",
   "engines": {
     "node": ">=0.8.0"
   },

test/compress/collapse_vars.js

@@ -43,6 +43,7 @@ collapse_vars_side_effects_1: {
                 z = i += 4;
             log(x, z, y, i);
         }
+        f1(), f2(), f3(), f4();
     }
     expect: {
         function f1() {
@@ -73,7 +74,9 @@ collapse_vars_side_effects_1: {
                 y = i += 3;
             log(x, i += 4, y, i);
         }
+        f1(), f2(), f3(), f4();
     }
+    expect_stdout: true
 }
 
 collapse_vars_side_effects_2: {
@@ -823,6 +826,7 @@ collapse_vars_repeated: {
             console.log(e + "!");
         })("!");
     }
+    expect_stdout: true
 }
 
 collapse_vars_closures: {
@@ -1109,6 +1113,7 @@ collapse_vars_eval_and_with: {
             return function() { with (o) console.log(a) };
         })()();
     }
+    expect_stdout: true
 }
 
 collapse_vars_constants: {
@@ -1152,7 +1157,8 @@ collapse_vars_arguments: {
     options = {
         collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
         comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true,
+        toplevel:true
     }
     input: {
         var outer = function() {
@@ -1167,6 +1173,7 @@ collapse_vars_arguments: {
             (function(){console.log(arguments);})(7, 1);
         })();
     }
+    expect_stdout: true
 }
 
 collapse_vars_short_circuit: {
@@ -1316,11 +1323,13 @@ collapse_vars_regexp: {
                 console.log(result[0]);
         })();
     }
+    expect_stdout: true
 }
 
 issue_1537: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     }
     input: {
         var k = '';
@@ -1335,6 +1344,7 @@ issue_1537: {
 issue_1537_for_of: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     }
     input: {
         var k = '';
@@ -1349,6 +1359,7 @@ issue_1537_for_of: {
 issue_1537_destructuring_1: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     }
     input: {
         var x = 1, y = 2;
@@ -1363,6 +1374,7 @@ issue_1537_destructuring_1: {
 issue_1537_destructuring_2: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     }
     input: {
         var x = foo();
@@ -1377,6 +1389,7 @@ issue_1537_destructuring_2: {
 issue_1537_destructuring_3: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     }
     input: {
         var x = Math.random();
@@ -1391,6 +1404,7 @@ issue_1537_destructuring_3: {
 issue_1537_destructuring_for_in: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     }
     input: {
         var x = 1, y = 2;
@@ -1409,6 +1423,7 @@ issue_1537_destructuring_for_in: {
 issue_1537_destructuring_for_of: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     }
     input: {
         var x = 1, y = 2;
@@ -1427,6 +1442,7 @@ issue_1537_destructuring_for_of: {
 issue_1562: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     }
     input: {
         var v = 1, B = 2;
@@ -1455,3 +1471,46 @@ issue_1562: {
         for (; f(z + 2) ;) bar(30);
     }
 }
+
+issue_1605_1: {
+    options = {
+        collapse_vars: true,
+        toplevel: false,
+    }
+    input: {
+        function foo(x) {
+            var y = x;
+            return y;
+        }
+        var o = new Object;
+        o.p = 1;
+    }
+    expect: {
+        function foo(x) {
+            return x;
+        }
+        var o = new Object;
+        o.p = 1;
+    }
+}
+
+issue_1605_2: {
+    options = {
+        collapse_vars: true,
+        toplevel: "vars",
+    }
+    input: {
+        function foo(x) {
+            var y = x;
+            return y;
+        }
+        var o = new Object;
+        o.p = 1;
+    }
+    expect: {
+        function foo(x) {
+            return x;
+        }
+        (new Object).p = 1;
+    }
+}

test/compress/concat-strings.js

@@ -51,6 +51,7 @@ concat_2: {
             "1" + "2" + "3"
         );
     }
+    expect_stdout: true
 }
 
 concat_3: {
@@ -79,6 +80,7 @@ concat_3: {
             1 + 2 + "3" + "4" + "5"
         );
     }
+    expect_stdout: true
 }
 
 concat_4: {
@@ -107,6 +109,7 @@ concat_4: {
             1 + "2" + "3" + "4" + "5"
         );
     }
+    expect_stdout: true
 }
 
 concat_5: {
@@ -135,6 +138,7 @@ concat_5: {
             "1" + 2 + "3" + "4" + "5"
         );
     }
+    expect_stdout: true
 }
 
 concat_6: {
@@ -163,6 +167,7 @@ concat_6: {
             "1" + "2" + "3" + "4" + "5"
         );
     }
+    expect_stdout: true
 }
 
 concat_7: {
@@ -188,6 +193,7 @@ concat_7: {
             x += "foo"
         );
     }
+    expect_stdout: true
 }
 
 concat_8: {
@@ -213,4 +219,5 @@ concat_8: {
             x += "foo"
         );
     }
+    expect_stdout: true
 }

test/compress/conditionals.js

@@ -797,3 +797,99 @@ no_evaluate: {
         }
     }
 }
+
+equality_conditionals_false: {
+    options = {
+        conditionals: false,
+        sequences: true,
+    }
+    input: {
+        function f(a, b, c) {
+            console.log(
+                a == (b ? a : a),
+                a == (b ? a : c),
+                a != (b ? a : a),
+                a != (b ? a : c),
+                a === (b ? a : a),
+                a === (b ? a : c),
+                a !== (b ? a : a),
+                a !== (b ? a : c)
+            );
+        }
+        f(0, 0, 0);
+        f(0, true, 0);
+        f(1, 2, 3);
+        f(1, null, 3);
+        f(NaN);
+        f(NaN, "foo");
+    }
+    expect: {
+        function f(a, b, c) {
+            console.log(
+                a == (b ? a : a),
+                a == (b ? a : c),
+                a != (b ? a : a),
+                a != (b ? a : c),
+                a === (b ? a : a),
+                a === (b ? a : c),
+                a !== (b ? a : a),
+                a !== (b ? a : c)
+            );
+        }
+        f(0, 0, 0),
+        f(0, true, 0),
+        f(1, 2, 3),
+        f(1, null, 3),
+        f(NaN),
+        f(NaN, "foo");
+    }
+    expect_stdout: true
+}
+
+equality_conditionals_true: {
+    options = {
+        conditionals: true,
+        sequences: true,
+    }
+    input: {
+        function f(a, b, c) {
+            console.log(
+                a == (b ? a : a),
+                a == (b ? a : c),
+                a != (b ? a : a),
+                a != (b ? a : c),
+                a === (b ? a : a),
+                a === (b ? a : c),
+                a !== (b ? a : a),
+                a !== (b ? a : c)
+            );
+        }
+        f(0, 0, 0);
+        f(0, true, 0);
+        f(1, 2, 3);
+        f(1, null, 3);
+        f(NaN);
+        f(NaN, "foo");
+    }
+    expect: {
+        function f(a, b, c) {
+            console.log(
+                (b, a == a),
+                a == (b ? a : c),
+                (b, a != a),
+                a != (b ? a : c),
+                (b, a === a),
+                a === (b ? a : c),
+                (b, a !== a),
+                a !== (b ? a : c)
+            );
+        }
+        f(0, 0, 0),
+        f(0, true, 0),
+        f(1, 2, 3),
+        f(1, null, 3),
+        f(NaN),
+        f(NaN, "foo");
+    }
+    expect_stdout: true
+}

test/compress/const.js

@@ -162,4 +162,5 @@ regexp_literal_not_const: {
             while (result = REGEXP_LITERAL.exec("acdabcdeabbb")) console.log(result[0]);
         })();
     }
+    expect_stdout: true
 }

test/compress/dead-code.js

@@ -87,6 +87,7 @@ dead_code_constant_boolean_should_warn_more: {
         var x = 10, y;
         var moo;
     }
+    expect_stdout: true
 }
 
 dead_code_block_decls_die: {
@@ -135,6 +136,7 @@ dead_code_const_declaration: {
         var moo;
         function bar() {}
     }
+    expect_stdout: true
 }
 
 dead_code_const_annotation: {
@@ -162,6 +164,7 @@ dead_code_const_annotation: {
         var moo;
         function bar() {}
     }
+    expect_stdout: true
 }
 
 dead_code_const_annotation_regex: {
@@ -185,6 +188,7 @@ dead_code_const_annotation_regex: {
         var CONST_FOO_ANN = !1;
         CONST_FOO_ANN && console.log('reachable');
     }
+    expect_stdout: true
 }
 
 dead_code_const_annotation_complex_scope: {
@@ -230,4 +234,5 @@ dead_code_const_annotation_complex_scope: {
         var meat = 'beef';
         var pork = 'bad';
     }
+    expect_stdout: true
 }

test/compress/destructuring.js

@@ -293,3 +293,17 @@ reduce_vars: {
         for ([x,y] in pairs);
     }
 }
+
+unused: {
+    options = {
+        unused: true,
+    }
+    input: {
+        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
+        console.log(a);
+    }
+    expect: {
+        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
+        console.log(a);
+    }
+}

test/compress/evaluate.js

@@ -200,6 +200,7 @@ negative_zero: {
             1 / (-0)
         );
     }
+    expect_stdout: true
 }
 
 positive_zero: {
@@ -220,6 +221,7 @@ positive_zero: {
             1 / (0)
         );
     }
+    expect_stdout: true
 }
 
 pow: {
@@ -337,6 +339,7 @@ unsafe_constant: {
             (void 0).a
         );
     }
+    expect_stdout: true
 }
 
 unsafe_object: {
@@ -360,6 +363,7 @@ unsafe_object: {
             1..b + 1
         );
     }
+    expect_stdout: true
 }
 
 unsafe_object_nested: {
@@ -383,6 +387,7 @@ unsafe_object_nested: {
             2
         );
     }
+    expect_stdout: true
 }
 
 unsafe_object_complex: {
@@ -406,6 +411,7 @@ unsafe_object_complex: {
             2
         );
     }
+    expect_stdout: true
 }
 
 unsafe_object_repeated: {
@@ -429,6 +435,7 @@ unsafe_object_repeated: {
             1..b + 1
         );
     }
+    expect_stdout: true
 }
 
 unsafe_object_accessor: {
@@ -478,6 +485,7 @@ unsafe_function: {
             ({a:{b:1},b:function(){}}).a.b + 1
         );
     }
+    expect_stdout: true
 }
 
 unsafe_integer_key: {
@@ -505,6 +513,7 @@ unsafe_integer_key: {
             1["1"] + 1
         );
     }
+    expect_stdout: true
 }
 
 unsafe_integer_key_complex: {
@@ -532,6 +541,7 @@ unsafe_integer_key_complex: {
             2
         );
     }
+    expect_stdout: true
 }
 
 unsafe_float_key: {
@@ -559,6 +569,7 @@ unsafe_float_key: {
             1["3.14"] + 1
         );
     }
+    expect_stdout: true
 }
 
 unsafe_float_key_complex: {
@@ -586,6 +597,7 @@ unsafe_float_key_complex: {
             2
         );
     }
+    expect_stdout: true
 }
 
 unsafe_array: {
@@ -621,6 +633,7 @@ unsafe_array: {
             (void 0)[1] + 1
         );
     }
+    expect_stdout: true
 }
 
 unsafe_string: {
@@ -648,6 +661,7 @@ unsafe_string: {
             "11"
         );
     }
+    expect_stdout: true
 }
 
 unsafe_array_bad_index: {
@@ -669,6 +683,7 @@ unsafe_array_bad_index: {
             [1, 2, 3, 4][3.14] + 1
         );
     }
+    expect_stdout: true
 }
 
 unsafe_string_bad_index: {
@@ -690,6 +705,7 @@ unsafe_string_bad_index: {
             "1234"[3.14] + 1
         );
     }
+    expect_stdout: true
 }
 
 unsafe_prototype_function: {
@@ -736,6 +752,7 @@ call_args: {
         console.log(1);
         +(1, 1);
     }
+    expect_stdout: true
 }
 
 call_args_drop_param: {
@@ -757,6 +774,7 @@ call_args_drop_param: {
         console.log(1);
         +(b, 1);
     }
+    expect_stdout: true
 }
 
 in_boolean_context: {
@@ -794,4 +812,74 @@ in_boolean_context: {
             (foo(), !1)
         );
     }
+    expect_stdout: true
+}
+
+unsafe_charAt: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            "1234" + 1,
+            "1234".charAt(0) + 1,
+            "1234".charAt(6 - 5) + 1,
+            ("12" + "34").charAt(0) + 1,
+            ("12" + "34").charAt(6 - 5) + 1,
+            [1, 2, 3, 4].join("").charAt(0) + 1
+        );
+    }
+    expect: {
+        console.log(
+            "12341",
+            "11",
+            "21",
+            "11",
+            "21",
+            "11"
+        );
+    }
+    expect_stdout: true
+}
+
+unsafe_charAt_bad_index: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            "1234".charAt() + 1,
+            "1234".charAt("a") + 1,
+            "1234".charAt(3.14) + 1
+        );
+    }
+    expect: {
+        console.log(
+            "11",
+            "11",
+            "41"
+        );
+    }
+    expect_stdout: true
+}
+
+unsafe_charAt_noop: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            s.charAt(0),
+            "string".charAt(x)
+        );
+    }
+    expect: {
+        console.log(
+            s.charAt(0),
+            "string".charAt(x)
+        );
+    }
 }

test/compress/functions.js

@@ -39,6 +39,7 @@ iifes_returning_constants_keep_fargs_true: {
         console.log(6);
         console.log((a(), b(), 6));
     }
+    expect_stdout: true
 }
 
 iifes_returning_constants_keep_fargs_false: {
@@ -73,6 +74,7 @@ iifes_returning_constants_keep_fargs_false: {
         console.log(6);
         console.log((a(), b(), 6));
     }
+    expect_stdout: true
 }
 
 issue_485_crashing_1530: {

test/compress/harmony.js

@@ -286,3 +286,48 @@ fat_arrow_as_param: {
     }
     expect_exact: "foo(x=>x);foo(x=>x,y=>y);foo(x=>(x,x));foo(x=>(x,x),y=>(y,y));"
 }
+
+default_assign: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a, b = 3) {
+            console.log(a);
+        }
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+    }
+}
+
+expansion: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a, ...b) {
+            console.log(a);
+        }
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+    }
+}
+
+issue_1613: {
+  mangle = { toplevel: true };
+  input: {
+    const name = 1;
+    const foo = {
+      name
+    };
+  }
+  expect_exact: "const n=1;const c={name:n};"
+}

test/compress/issue-1202.js

@@ -49,4 +49,3 @@ mangle_keep_fnames_true: {
         }
     }
 }
-

test/compress/issue-1275.js

@@ -46,4 +46,5 @@ string_plus_optimization: {
         }
         foo();
     }
+    expect_stdout: true
 }

test/compress/issue-1321.js

@@ -14,6 +14,7 @@ issue_1321_no_debug: {
         x["a"] = 2 * x.b;
         console.log(x.b, x["a"]);
     }
+    expect_stdout: true
 }
 
 issue_1321_debug: {
@@ -33,6 +34,7 @@ issue_1321_debug: {
         x["_$foo$_"] = 2 * x.a;
         console.log(x.a, x["_$foo$_"]);
     }
+    expect_stdout: true
 }
 
 issue_1321_with_quoted: {
@@ -51,4 +53,5 @@ issue_1321_with_quoted: {
         x["b"] = 2 * x.a;
         console.log(x.a, x["b"]);
     }
+    expect_stdout: true
 }

test/compress/issue-1447.js

@@ -42,4 +42,5 @@ conditional_false_stray_else_in_loop: {
         }
     }
     expect_exact: "for(var i=1;i<=4;++i)if(!(i<=2))console.log(i);"
+    expect_stdout: true
 }

test/compress/issue-1466.js

@@ -13,9 +13,9 @@ same_variable_in_multiple_for_loop: {
         join_vars: true,
         cascade: true,
         side_effects: true,
-        collapse_vars: true
-    };
-    mangle = {};
+        collapse_vars: true,
+    }
+    mangle = {}
     input: {
         for (let i = 0; i < 3; i++) {
             let a = 100;
@@ -38,6 +38,7 @@ same_variable_in_multiple_for_loop: {
             }
         }
     }
+    expect_stdout: true
 }
 
 same_variable_in_multiple_forOf: {
@@ -55,9 +56,9 @@ same_variable_in_multiple_forOf: {
         join_vars: true,
         cascade: true,
         side_effects: true,
-        collapse_vars: true
-    };
-    mangle = {};
+        collapse_vars: true,
+    }
+    mangle = {}
     input: {
         var test = [ "a", "b", "c" ];
         for (let tmp of test) {
@@ -75,10 +76,11 @@ same_variable_in_multiple_forOf: {
             console.log(o);
             let e;
             e = [ "e", "f", "g" ];
-            for (let o of e) 
+            for (let o of e)
                 console.log(o);
         }
     }
+    expect_stdout: true
 }
 
 same_variable_in_multiple_forIn: {
@@ -96,9 +98,9 @@ same_variable_in_multiple_forIn: {
         join_vars: true,
         cascade: true,
         side_effects: true,
-        collapse_vars: true
-    };
-    mangle = {};
+        collapse_vars: true,
+    }
+    mangle = {}
     input: {
         var test = [ "a", "b", "c" ];
         for (let tmp in test) {
@@ -120,6 +122,7 @@ same_variable_in_multiple_forIn: {
                 console.log(o);
         }
     }
+    expect_stdout: true
 }
 
 different_variable_in_multiple_for_loop: {
@@ -137,9 +140,9 @@ different_variable_in_multiple_for_loop: {
         join_vars: true,
         cascade: true,
         side_effects: true,
-        collapse_vars: true
-    };
-    mangle = {};
+        collapse_vars: true,
+    }
+    mangle = {}
     input: {
         for (let i = 0; i < 3; i++) {
             let a = 100;
@@ -162,6 +165,7 @@ different_variable_in_multiple_for_loop: {
             }
         }
     }
+    expect_stdout: true
 }
 
 different_variable_in_multiple_forOf: {
@@ -179,9 +183,9 @@ different_variable_in_multiple_forOf: {
         join_vars: true,
         cascade: true,
         side_effects: true,
-        collapse_vars: true
-    };
-    mangle = {};
+        collapse_vars: true,
+    }
+    mangle = {}
     input: {
         var test = [ "a", "b", "c" ];
         for (let tmp of test) {
@@ -203,6 +207,7 @@ different_variable_in_multiple_forOf: {
                 console.log(o);
         }
     }
+    expect_stdout: true
 }
 
 different_variable_in_multiple_forIn: {
@@ -220,9 +225,9 @@ different_variable_in_multiple_forIn: {
         join_vars: true,
         cascade: true,
         side_effects: true,
-        collapse_vars: true
-    };
-    mangle = {};
+        collapse_vars: true,
+    }
+    mangle = {}
     input: {
         var test = [ "a", "b", "c" ];
         for (let tmp in test) {
@@ -244,6 +249,7 @@ different_variable_in_multiple_forIn: {
                 console.log(o);
         }
     }
+    expect_stdout: true
 }
 
 more_variable_in_multiple_for: {
@@ -261,9 +267,9 @@ more_variable_in_multiple_for: {
         join_vars: true,
         cascade: true,
         side_effects: true,
-        collapse_vars: true
-    };
-    mangle = {};
+        collapse_vars: true,
+    }
+    mangle = {}
     input: {
         for (let a = 9, i = 0; i < 20; i += a) {
             let b = a++ + i;
@@ -281,5 +287,5 @@ more_variable_in_multiple_for: {
                 console.log(o, c, e, l, f);
         }
     }
+    expect_stdout: true
 }
-

test/compress/issue-1588.js

@@ -0,0 +1,99 @@
+screw_ie8: {
+    options = {
+        screw_ie8: true,
+    }
+    mangle = {
+        screw_ie8: true,
+    }
+    input: {
+        try { throw "foo"; } catch (x) { console.log(x); }
+    }
+    expect_exact: 'try{throw"foo"}catch(o){console.log(o)}'
+    expect_stdout: [
+        "foo"
+    ]
+}
+
+support_ie8: {
+    options = {
+        screw_ie8: false,
+    }
+    mangle = {
+        screw_ie8: false,
+    }
+    input: {
+        try { throw "foo"; } catch (x) { console.log(x); }
+    }
+    expect_exact: 'try{throw"foo"}catch(x){console.log(x)}'
+    expect_stdout: "foo"
+}
+
+safe_undefined: {
+    options = {
+        conditionals: true,
+        if_return: true,
+        unsafe: false,
+    }
+    mangle = {}
+    input: {
+        var a, c;
+        console.log(function(undefined) {
+            return function() {
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+            };
+        }(1)());
+    }
+    expect: {
+        var a, c;
+        console.log(function(n) {
+            return function() {
+                return a ? b : c ? d : void 0;
+            };
+        }(1)());
+    }
+    expect_stdout: true
+}
+
+unsafe_undefined: {
+    options = {
+        conditionals: true,
+        if_return: true,
+        unsafe: true,
+    }
+    mangle = {}
+    input: {
+        var a, c;
+        console.log(function(undefined) {
+            return function() {
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+            };
+        }()());
+    }
+    expect: {
+        var a, c;
+        console.log(function(n) {
+            return function() {
+                return a ? b : c ? d : n;
+            };
+        }()());
+    }
+    expect_stdout: true
+}
+
+runtime_error: {
+    input: {
+        const a = 1;
+        console.log(a++);
+    }
+    expect: {
+        const a = 1;
+        console.log(a++);
+    }
+    expect_stdout: true
+}

test/compress/issue-1609.js

@@ -0,0 +1,56 @@
+chained_evaluation_1: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var a = 1;
+            (function() {
+                var b = a, c;
+                c = f(b);
+                c.bar = b;
+            })();
+        })();
+    }
+    expect: {
+        (function() {
+            (function() {
+                var c;
+                c = f(1);
+                c.bar = 1;
+            })();
+        })();
+    }
+}
+
+chained_evaluation_2: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var a = "long piece of string";
+            (function() {
+                var b = a, c;
+                c = f(b);
+                c.bar = b;
+            })();
+        })();
+    }
+    expect: {
+        (function() {
+            var a = "long piece of string";
+            (function() {
+                var c;
+                c = f(a);
+                c.bar = a;
+            })();
+        })();
+    }
+}

test/compress/issue-640.js

@@ -48,6 +48,7 @@ dead_code_const_annotation_regex: {
         var CONST_FOO_ANN = !1;
         if (CONST_FOO_ANN) console.log('reachable');
     }
+    expect_stdout: true
 }
 
 drop_console_2: {
@@ -225,6 +226,7 @@ issue_1254_negate_iife_true: {
         })()();
     }
     expect_exact: '(function(){return function(){console.log("test")}})()();'
+    expect_stdout: true
 }
 
 issue_1254_negate_iife_nested: {
@@ -240,6 +242,7 @@ issue_1254_negate_iife_nested: {
         })()()()()();
     }
     expect_exact: '(function(){return function(){console.log("test")}})()()()()();'
+    expect_stdout: true
 }
 
 conditional: {

test/compress/issue-892.js

@@ -29,4 +29,5 @@ dont_mangle_arguments: {
         })(5,6,7);
     }
     expect_exact: "(function(){var arguments=arguments,o=9;console.log(o,arguments)})(5,6,7);"
+    expect_stdout: true
 }

test/compress/issue-973.js

@@ -50,6 +50,7 @@ this_binding_conditionals: {
 this_binding_collapse_vars: {
     options = {
         collapse_vars: true,
+        toplevel: true,
     };
     input: {
         var c = a; c();

test/compress/issue-976.js

@@ -42,6 +42,7 @@ eval_collapse_vars: {
             eval("console.log(a);");
         })(eval);
     }
+    expect_stdout: true
 }
 
 eval_unused: {

test/compress/labels.js

@@ -9,6 +9,7 @@ labels_1: {
     expect: {
         foo || console.log("bar");
     }
+    expect_stdout: true
 }
 
 labels_2: {
@@ -40,6 +41,7 @@ labels_3: {
         for (var i = 0; i < 5; ++i)
             i < 3 || console.log(i);
     }
+    expect_stdout: true
 }
 
 labels_4: {
@@ -54,6 +56,7 @@ labels_4: {
         for (var i = 0; i < 5; ++i)
             i < 3 || console.log(i);
     }
+    expect_stdout: true
 }
 
 labels_5: {

test/compress/loops.js

@@ -166,6 +166,7 @@ keep_collapse_const_in_own_block_scope: {
             console.log(i);
         console.log(c);
     }
+    expect_stdout: true
 }
 
 keep_collapse_const_in_own_block_scope_2: {
@@ -186,6 +187,7 @@ keep_collapse_const_in_own_block_scope_2: {
             console.log(i);
         console.log(c);
     }
+    expect_stdout: true
 }
 
 evaluate: {
@@ -295,7 +297,15 @@ issue_186_beautify: {
         else
             bar();
     }
-    expect_exact: 'var x = 3;\n\nif (foo()) do {\n    do {\n        alert(x);\n    } while (--x);\n} while (x); else bar();'
+    expect_exact: [
+        'var x = 3;',
+        '',
+        'if (foo()) do {',
+        '    do {',
+        '        alert(x);',
+        '    } while (--x);',
+        '} while (x); else bar();',
+    ]
 }
 
 issue_186_beautify_ie8: {
@@ -314,7 +324,17 @@ issue_186_beautify_ie8: {
         else
             bar();
     }
-    expect_exact: 'var x = 3;\n\nif (foo()) {\n    do {\n        do {\n            alert(x);\n        } while (--x);\n    } while (x);\n} else bar();'
+    expect_exact: [
+        'var x = 3;',
+        '',
+        'if (foo()) {',
+        '    do {',
+        '        do {',
+        '            alert(x);',
+        '        } while (--x);',
+        '    } while (x);',
+        '} else bar();',
+    ]
 }
 
 issue_186_bracketize: {
@@ -374,7 +394,19 @@ issue_186_beautify_bracketize: {
         else
             bar();
     }
-    expect_exact: 'var x = 3;\n\nif (foo()) {\n    do {\n        do {\n            alert(x);\n        } while (--x);\n    } while (x);\n} else {\n    bar();\n}'
+    expect_exact: [
+        'var x = 3;',
+        '',
+        'if (foo()) {',
+        '    do {',
+        '        do {',
+        '            alert(x);',
+        '        } while (--x);',
+        '    } while (x);',
+        '} else {',
+        '    bar();',
+        '}',
+    ]
 }
 
 issue_186_beautify_bracketize_ie8: {
@@ -394,5 +426,17 @@ issue_186_beautify_bracketize_ie8: {
         else
             bar();
     }
-    expect_exact: 'var x = 3;\n\nif (foo()) {\n    do {\n        do {\n            alert(x);\n        } while (--x);\n    } while (x);\n} else {\n    bar();\n}'
+    expect_exact: [
+        'var x = 3;',
+        '',
+        'if (foo()) {',
+        '    do {',
+        '        do {',
+        '            alert(x);',
+        '        } while (--x);',
+        '    } while (x);',
+        '} else {',
+        '    bar();',
+        '}',
+    ]
 }

test/compress/max_line_len.js

@@ -7,7 +7,13 @@ too_short: {
             return { c: 42, d: a(), e: "foo"};
         }
     }
-    expect_exact: 'function f(a){\nreturn{\nc:42,\nd:a(),\ne:"foo"}}'
+    expect_exact: [
+        'function f(a){',
+        'return{',
+        'c:42,',
+        'd:a(),',
+        'e:"foo"}}',
+    ]
     expect_warnings: [
         "WARN: Output exceeds 10 characters"
     ]
@@ -22,7 +28,12 @@ just_enough: {
             return { c: 42, d: a(), e: "foo"};
         }
     }
-    expect_exact: 'function f(a){\nreturn{c:42,\nd:a(),e:"foo"}\n}'
+    expect_exact: [
+        'function f(a){',
+        'return{c:42,',
+        'd:a(),e:"foo"}',
+        '}',
+    ]
     expect_warnings: [
     ]
 }

test/compress/negate-iife.js

@@ -70,6 +70,7 @@ negate_iife_3_evaluate: {
     expect: {
         console.log(true);
     }
+    expect_stdout: true
 }
 
 negate_iife_3_side_effects: {
@@ -111,6 +112,7 @@ negate_iife_3_off_evaluate: {
     expect: {
         console.log(true);
     }
+    expect_stdout: true
 }
 
 negate_iife_4: {
@@ -243,6 +245,7 @@ negate_iife_nested: {
             }(7);
         }).f();
     }
+    expect_stdout: true
 }
 
 negate_iife_nested_off: {
@@ -275,6 +278,7 @@ negate_iife_nested_off: {
             })(7);
         }).f();
     }
+    expect_stdout: true
 }
 
 negate_iife_issue_1073: {
@@ -299,6 +303,7 @@ negate_iife_issue_1073: {
             };
         }(7))();
     }
+    expect_stdout: true
 }
 
 issue_1254_negate_iife_false: {
@@ -313,6 +318,7 @@ issue_1254_negate_iife_false: {
         })()();
     }
     expect_exact: '(function(){return function(){console.log("test")}})()();'
+    expect_stdout: true
 }
 
 issue_1254_negate_iife_true: {
@@ -327,6 +333,7 @@ issue_1254_negate_iife_true: {
         })()();
     }
     expect_exact: '!function(){return function(){console.log("test")}}()();'
+    expect_stdout: true
 }
 
 issue_1254_negate_iife_nested: {
@@ -341,6 +348,7 @@ issue_1254_negate_iife_nested: {
         })()()()()();
     }
     expect_exact: '!function(){return function(){console.log("test")}}()()()()();'
+    expect_stdout: true
 }
 
 issue_1288: {

test/compress/object.js

@@ -157,16 +157,20 @@ computed_property_names_evaluated_2: {
 
 shorthand_properties: {
     mangle = true;
-    input: (function() {
-        var prop = 1;
-        const value = {prop};
-        return value;
-    })();
-    expect: (function() {
-        var n = 1;
-        const r = {prop:n};
-        return r;
-    })();
+    input: {
+        (function() {
+            var prop = 1;
+            const value = {prop};
+            return value;
+        })();
+    }
+    expect: {
+        (function() {
+            var n = 1;
+            const r = {prop:n};
+            return r;
+        })();
+    }
 }
 
 concise_methods: {
@@ -233,9 +237,7 @@ concise_methods_with_computed_property2: {
         };
         doSomething(foo[[1]]());
     }
-    expect_exact: {
-        'var foo={[[1]](){return"success"}};doSomething(foo[[1]]());'
-    }
+    expect_exact: 'var foo={[[1]](){return"success"}};doSomething(foo[[1]]());'
 }
 
 concise_methods_with_various_property_names: {
@@ -507,4 +509,4 @@ variable_as_computed_property: {
         }
     }
     expect_exact: "function getLine(header){return{[header]:{}}}"
-}
+}

test/compress/reduce_vars.js

@@ -58,6 +58,7 @@ reduce_vars: {
         })();
         console.log(2);
     }
+    expect_stdout: true
 }
 
 modified: {
@@ -166,7 +167,7 @@ modified: {
             console.log(A ? 'yes' : 'no');
             console.log(B ? 'yes' : 'no');
         }
-   }
+    }
 }
 
 unsafe_evaluate: {
@@ -401,6 +402,7 @@ iife: {
             console.log(0, 1 * b, 5);
         }(1, 2, 3);
     }
+    expect_stdout: true
 }
 
 iife_new: {
@@ -420,6 +422,7 @@ iife_new: {
             console.log(0, 1 * b, 5);
         }(1, 2, 3);
     }
+    expect_stdout: true
 }
 
 multi_def: {
@@ -707,6 +710,7 @@ toplevel_on: {
     expect: {
         console.log(3);
     }
+    expect_stdout: true
 }
 
 toplevel_off: {
@@ -724,6 +728,7 @@ toplevel_off: {
         var x = 3;
         console.log(x);
     }
+    expect_stdout: true
 }
 
 toplevel_on_loops_1: {
@@ -751,6 +756,7 @@ toplevel_on_loops_1: {
             })();
         while (x);
     }
+    expect_stdout: true
 }
 
 toplevel_off_loops_1: {
@@ -779,6 +785,7 @@ toplevel_off_loops_1: {
             bar();
         while (x);
     }
+    expect_stdout: true
 }
 
 toplevel_on_loops_2: {
@@ -1121,6 +1128,7 @@ defun_label: {
             }(2));
         }();
     }
+    expect_stdout: true
 }
 
 double_reference: {
@@ -1164,6 +1172,7 @@ iife_arguments_1: {
             return f;
         });
     }
+    expect_stdout: true
 }
 
 iife_arguments_2: {
@@ -1186,6 +1195,7 @@ iife_arguments_2: {
             }() === arguments[0]);
         })();
     }
+    expect_stdout: true
 }
 
 iife_eval_1: {
@@ -1207,6 +1217,7 @@ iife_eval_1: {
             return f;
         });
     }
+    expect_stdout: true
 }
 
 iife_eval_2: {
@@ -1230,6 +1241,7 @@ iife_eval_2: {
             console.log(x() === eval("x"));
         })();
     }
+    expect_stdout: true
 }
 
 iife_func_side_effects: {
@@ -1252,3 +1264,103 @@ iife_func_side_effects: {
         })(x(), 0, z());
     }
 }
+
+issue_1595_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function f(a) {
+            return f(a + 1);
+        })(2);
+    }
+    expect: {
+        (function f(a) {
+            return f(a + 1);
+        })(2);
+    }
+}
+
+issue_1595_2: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function f(a) {
+            return g(a + 1);
+        })(2);
+    }
+    expect: {
+        (function(a) {
+            return g(a + 1);
+        })(2);
+    }
+}
+
+issue_1595_3: {
+    options = {
+        evaluate: true,
+        passes: 2,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function f(a) {
+            return g(a + 1);
+        })(2);
+    }
+    expect: {
+        (function(a) {
+            return g(3);
+        })();
+    }
+}
+
+issue_1595_4: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function iife(a, b, c) {
+            console.log(a, b, c);
+            if (a) iife(a - 1, b, c);
+        })(3, 4, 5);
+    }
+    expect: {
+        (function iife(a, b, c) {
+            console.log(a, b, c);
+            if (a) iife(a - 1, b, c);
+        })(3, 4, 5);
+    }
+    expect_stdout: true
+}
+
+issue_1606: {
+    options = {
+        evaluate: true,
+        hoist_vars: true,
+        reduce_vars: true,
+    }
+    input: {
+        function f() {
+            var a;
+            function g(){};
+            var b = 2;
+            x(b);
+        }
+    }
+    expect: {
+        function f() {
+            var a, b;
+            function g(){};
+            b = 2;
+            x(b);
+        }
+    }
+}

test/compress/screw-ie8.js

@@ -1,20 +1,29 @@
 do_screw: {
-    options = { screw_ie8: true };
+    options = {
+        screw_ie8: true,
+    }
     beautify = {
         screw_ie8: true,
-        ascii_only: true
-    };
-
-    input: f("\v");
-    expect_exact: 'f("\\v");';
+        ascii_only: true,
+    }
+    input: {
+        f("\v");
+    }
+    expect_exact: 'f("\\v");'
 }
 
 dont_screw: {
-    options = { screw_ie8: false };
-    beautify = { screw_ie8: false, ascii_only: true };
-
-    input: f("\v");
-    expect_exact: 'f("\\x0B");';
+    options = {
+        screw_ie8: false,
+    }
+    beautify = {
+        screw_ie8: false,
+        ascii_only: true,
+    }
+    input: {
+        f("\v");
+    }
+    expect_exact: 'f("\\x0B");'
 }
 
 do_screw_constants: {
@@ -119,6 +128,7 @@ do_screw_try_catch_undefined: {
             return void 0===o
         }
     }
+    expect_stdout: true
 }
 
 dont_screw_try_catch_undefined: {
@@ -147,6 +157,7 @@ dont_screw_try_catch_undefined: {
             return n === undefined
         }
     }
+    expect_stdout: true
 }
 
 reduce_vars: {
@@ -199,6 +210,7 @@ issue_1586_1: {
         }
     }
     expect_exact: "function f(){try{}catch(c){console.log(c.message)}}"
+    expect_stdout: true
 }
 
 issue_1586_2: {
@@ -217,4 +229,5 @@ issue_1586_2: {
         }
     }
     expect_exact: "function f(){try{}catch(c){console.log(c.message)}}"
+    expect_stdout: true
 }

test/compress/sequences.js

@@ -86,6 +86,7 @@ make_sequences_4: {
         switch (x = 5, y) {}
         with (x = 5, obj);
     }
+    expect_stdout: true
 }
 
 lift_sequences_1: {
@@ -103,15 +104,18 @@ lift_sequences_1: {
 lift_sequences_2: {
     options = { sequences: true, evaluate: true };
     input: {
-        var foo, bar;
+        var foo = 1, bar;
         foo.x = (foo = {}, 10);
         bar = (bar = {}, 10);
+        console.log(foo, bar);
     }
     expect: {
-        var foo, bar;
+        var foo = 1, bar;
         foo.x = (foo = {}, 10),
-        bar = {}, bar = 10;
+        bar = {}, bar = 10,
+        console.log(foo, bar);
     }
+    expect_stdout: true
 }
 
 lift_sequences_3: {
@@ -138,6 +142,23 @@ lift_sequences_4: {
     }
 }
 
+lift_sequences_5: {
+    options = {
+        sequences: true,
+    }
+    input: {
+        var a = 2, b;
+        a *= (b, a = 4, 3);
+        console.log(a);
+    }
+    expect: {
+        var a = 2, b;
+        b, a *= (a = 4, 3),
+        console.log(a);
+    }
+    expect_stdout: "6"
+}
+
 for_sequences: {
     options = { sequences: true };
     input: {
@@ -230,6 +251,7 @@ negate_iife_for: {
         for (!function() {}(), i = 0; i < 5; i++) console.log(i);
         for (function() {}(); i < 5; i++) console.log(i);
     }
+    expect_stdout: true
 }
 
 iife: {

test/compress/transform.js

@@ -0,0 +1,131 @@
+booleans_evaluate: {
+    options = {
+        booleans: true,
+        evaluate: true,
+    }
+    input: {
+        console.log(typeof void 0 != "undefined");
+        console.log(1 == 1, 1 === 1)
+        console.log(1 != 1, 1 !== 1)
+    }
+    expect: {
+        console.log(!1);
+        console.log(!0, !0);
+        console.log(!1, !1);
+    }
+    expect_stdout: true
+}
+
+booleans_global_defs: {
+    options = {
+        booleans: true,
+        evaluate: true,
+        global_defs: {
+            A: true,
+        },
+    }
+    input: {
+        console.log(A == 1);
+    }
+    expect: {
+        console.log(!0);
+    }
+    expect_stdout: true
+}
+
+condition_evaluate: {
+    options = {
+        booleans: true,
+        dead_code: false,
+        evaluate: true,
+        loops: false,
+    }
+    input: {
+        while (1 === 2);
+        for (; 1 == true;);
+        if (void 0 == null);
+    }
+    expect: {
+        while (!1);
+        for (; !0;);
+        if (!0);
+    }
+}
+
+if_else_empty: {
+    options = {
+        conditionals: true,
+    }
+    input: {
+        if ({} ? a : b); else {}
+    }
+    expect: {
+        !{} ? b : a;
+    }
+}
+
+label_if_break: {
+    options = {
+        conditionals: true,
+        dead_code: true,
+        evaluate: true,
+    }
+    input: {
+        L: if (true) {
+            a;
+            break L;
+        }
+    }
+    expect: {
+        a;
+    }
+}
+
+while_if_break: {
+    options = {
+        conditionals: true,
+        loops: true,
+        sequences: true,
+    }
+    input: {
+        while (a) {
+            if (b) if(c) d;
+            if (e) break;
+        }
+    }
+    expect: {
+        for(; a && (b && c && d, !e););
+    }
+}
+
+if_return: {
+    options = {
+        booleans: true,
+        conditionals: true,
+        if_return: true,
+        sequences: true,
+    }
+    input: {
+        function f(w, x, y, z) {
+            if (x) return;
+            if (w) {
+                if (y) return;
+            } else if (z) return;
+            if (x == y) return true;
+
+            if (x) w();
+            if (y) z();
+            return true;
+        }
+    }
+    expect: {
+        function f(w, x, y, z) {
+            if (!x) {
+                if (w) {
+                    if (y) return;
+                } else if (z) return;
+                return x == y || (x && w(), y && z(), !0);
+            }
+        }
+    }
+}

test/mocha/cli.js

@@ -152,7 +152,7 @@ describe("bin/uglifyjs", function () {
        });
     });
     it("Should process inline source map", function(done) {
-        var command = uglifyjscmd + ' test/input/issue-520/input.js -cm toplevel --in-source-map inline --source-map-inline';
+        var command = uglifyjscmd + ' test/input/issue-520/input.js -mc toplevel --in-source-map inline --source-map-inline';
 
         exec(command, function (err, stdout) {
             if (err) throw err;

test/mocha/directives.js

@@ -397,7 +397,7 @@ describe("Directives", function() {
             if (node instanceof uglify.AST_Symbol && node.name === "_check_") {
                 checked = true;
                 for (var j = 0; j < tests[i].directives.length; j++) {
-                    assert.equal(checkWalker.has_directive(tests[i].directives[j]), true,
+                    assert.ok(checkWalker.has_directive(tests[i].directives[j]),
                         "Did not found directive '" + tests[i].directives[j] +  "' in test " + tests[i].input)
                 }
                 for (var k = 0; k < tests[i].non_directives.length; k++) {

test/mocha/minify.js

@@ -78,6 +78,7 @@ describe("minify", function() {
         });
         it("Should process inline source map", function() {
             var code = Uglify.minify("./test/input/issue-520/input.js", {
+                compress: { toplevel: true },
                 inSourceMap: "inline",
                 sourceMapInline: true
             }).code + "\n";

test/run-tests.js

@@ -6,10 +6,22 @@ var U = require("../tools/node");
 var path = require("path");
 var fs = require("fs");
 var assert = require("assert");
+var vm = require("vm");
 
 var tests_dir = path.dirname(module.filename);
 var failures = 0;
 var failed_files = {};
+var same_stdout = ~process.version.lastIndexOf("v0.12.", 0) ? function(expected, actual) {
+    if (typeof expected != typeof actual) return false;
+    if (typeof expected != "string") {
+        if (expected.name != actual.name) return false;
+        expected = expected.message.slice(expected.message.lastIndexOf("\n") + 1);
+        actual = actual.message.slice(actual.message.lastIndexOf("\n") + 1);
+    }
+    return expected == actual;
+} : function(expected, actual) {
+    return typeof expected == typeof actual && expected.toString() == actual.toString();
+};
 
 run_compress_tests();
 if (failures) {
@@ -71,10 +83,15 @@ function test_directory(dir) {
 }
 
 function as_toplevel(input, mangle_options) {
-    if (input instanceof U.AST_BlockStatement) input = input.body;
-    else if (input instanceof U.AST_Statement) input = [ input ];
-    else throw new Error("Unsupported input syntax");
-    var toplevel = new U.AST_Toplevel({ body: input });
+    if (!(input instanceof U.AST_BlockStatement))
+        throw new Error("Unsupported input syntax");
+    for (var i = 0; i < input.body.length; i++) {
+        var stat = input.body[i];
+        if (stat instanceof U.AST_SimpleStatement && stat.body instanceof U.AST_String)
+            input.body[i] = new U.AST_Directive(stat.body);
+        else break;
+    }
+    var toplevel = new U.AST_Toplevel(input);
     toplevel.figure_out_scope(mangle_options);
     return toplevel;
 }
@@ -165,6 +182,36 @@ function run_compress_tests() {
                         failed_files[file] = 1;
                     }
                 }
+                if (test.expect_stdout) {
+                    var stdout = run_code(make_code(input, output_options));
+                    if (test.expect_stdout === true) {
+                        test.expect_stdout = stdout;
+                    }
+                    if (!same_stdout(test.expect_stdout, stdout)) {
+                        log("!!! Invalid input or expected stdout\n---INPUT---\n{input}\n---EXPECTED {expected_type}---\n{expected}\n---ACTUAL {actual_type}---\n{actual}\n\n", {
+                            input: input_code,
+                            expected_type: typeof test.expect_stdout == "string" ? "STDOUT" : "ERROR",
+                            expected: test.expect_stdout,
+                            actual_type: typeof stdout == "string" ? "STDOUT" : "ERROR",
+                            actual: stdout,
+                        });
+                        failures++;
+                        failed_files[file] = 1;
+                    } else {
+                        stdout = run_code(output);
+                        if (!same_stdout(test.expect_stdout, stdout)) {
+                            log("!!! failed\n---INPUT---\n{input}\n---EXPECTED {expected_type}---\n{expected}\n---ACTUAL {actual_type}---\n{actual}\n\n", {
+                                input: input_code,
+                                expected_type: typeof test.expect_stdout == "string" ? "STDOUT" : "ERROR",
+                                expected: test.expect_stdout,
+                                actual_type: typeof stdout == "string" ? "STDOUT" : "ERROR",
+                                actual: stdout,
+                            });
+                            failures++;
+                            failed_files[file] = 1;
+                        }
+                    }
+                }
             }
         }
         var tests = parse_test(path.resolve(dir, file));
@@ -214,6 +261,23 @@ function parse_test(file) {
         }));
     }
 
+    function read_string(stat) {
+        if (stat.TYPE == "SimpleStatement") {
+            var body = stat.body;
+            switch(body.TYPE) {
+              case "String":
+                return body.value;
+              case "Array":
+                return body.elements.map(function(element) {
+                    if (element.TYPE !== "String")
+                        throw new Error("Should be array of strings");
+                    return element.value;
+                }).join("\n");
+            }
+        }
+        throw new Error("Should be string or array of strings");
+    }
+
     function get_one_test(name, block) {
         var test = { name: name, options: {} };
         var tw = new U.TreeWalker(function(node, descend){
@@ -226,28 +290,26 @@ function parse_test(file) {
                 return true;
             }
             if (node instanceof U.AST_LabeledStatement) {
+                var label = node.label;
                 assert.ok(
-                    ["input", "expect", "expect_exact", "expect_warnings"].indexOf(node.label.name) >= 0,
+                    ["input", "expect", "expect_exact", "expect_warnings", "expect_stdout"].indexOf(label.name) >= 0,
                     tmpl("Unsupported label {name} [{line},{col}]", {
-                        name: node.label.name,
-                        line: node.label.start.line,
-                        col: node.label.start.col
+                        name: label.name,
+                        line: label.start.line,
+                        col: label.start.col
                     })
                 );
                 var stat = node.body;
-                if (stat instanceof U.AST_BlockStatement) {
-                    if (stat.body.length == 1) stat = stat.body[0];
-                    else if (stat.body.length == 0) stat = new U.AST_EmptyStatement();
-                }
-                if (node.label.name === "expect_exact") {
-                    if (!(stat.TYPE === "SimpleStatement" && stat.body.TYPE === "String")) {
-                        throw new Error(
-                            "The value of the expect_exact clause should be a string, " +
-                            "like `expect_exact: \"some.exact.javascript;\"`");
+                if (label.name == "expect_exact") {
+                    test[label.name] = read_string(stat);
+                } else if (label.name == "expect_stdout") {
+                    if (stat.TYPE == "SimpleStatement" && stat.body instanceof U.AST_Boolean) {
+                        test[label.name] = stat.body.value;
+                    } else {
+                        test[label.name] = read_string(stat) + "\n";
                     }
-                    test[node.label.name] = stat.body.start.value
                 } else {
-                    test[node.label.name] = stat;
+                    test[label.name] = stat;
                 }
                 return true;
             }
@@ -269,3 +331,19 @@ function evaluate(code) {
         code = make_code(code, { beautify: true });
     return new Function("return(" + code + ")")();
 }
+
+function run_code(code) {
+    var stdout = "";
+    var original_write = process.stdout.write;
+    process.stdout.write = function(chunk) {
+        stdout += chunk;
+    };
+    try {
+        new vm.Script(code).runInNewContext({ console: console }, { timeout: 5000 });
+        return stdout;
+    } catch (ex) {
+        return ex;
+    } finally {
+        process.stdout.write = original_write;
+    }
+}