Fix uglify attempting to rewrite invalid new expressions

3 files changed, 50 insertions, 2 deletions

diff --git a/lib/output.js b/lib/output.js
index f8787582..f5ca0261 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -515,7 +515,8 @@ function OutputStream(options) {
 
     PARENS([ AST_Unary, AST_Undefined ], function(output){
         var p = output.parent();
-        return p instanceof AST_PropAccess && p.expression === this;
+        return p instanceof AST_PropAccess && p.expression === this
+            || p instanceof AST_New;
     });
 
     PARENS(AST_Seq, function(output){
@@ -1283,7 +1284,12 @@ function OutputStream(options) {
 
     // self should be AST_New.  decide if we want to show parens or not.
     function no_constructor_parens(self, output) {
-        return self.args.length == 0 && !output.option("beautify");
+        return self.args.length == 0 && !output.option("beautify") ||
+            !(self.expression instanceof AST_SymbolRef ||
+              self.expression instanceof AST_Call ||
+              self.expression instanceof AST_Function ||
+              self.expression instanceof AST_Assign
+            );
     };
 
     function best_of(a) {
diff --git a/test/compress/new.js b/test/compress/new.js
index 4b2c51c3..d956ae27 100644
--- a/test/compress/new.js
+++ b/test/compress/new.js
@@ -10,3 +10,11 @@ new_statement: {
     }
     expect_exact: "new x(1);new x(1)(2);new x(1)(2)(3);new new x(1);new new x(1)(2);new new x(1)(2);(new new x(1))(2);"
 }
+
+new_with_rewritten_true_value: {
+    options = { booleans: true }
+    input: {
+        new true;
+    }
+    expect_exact: "new(!0);"
+}
diff --git a/test/mocha/new.js b/test/mocha/new.js
new file mode 100644
index 00000000..7e7aea7d
--- /dev/null
+++ b/test/mocha/new.js
@@ -0,0 +1,34 @@
+var assert = require("assert");
+var uglify = require("../../");
+
+describe("New", function() {
+    it("Should attach callback parens after some tokens", function() {
+        var tests = [
+            "new x(1);",
+            "new (function(foo){this.foo=foo;})(1);",
+            "new true;",
+            "new (0);",
+            "new (!0);",
+            "new (bar = function(foo) {this.foo=foo;})(123);"
+        ];
+        var expected = [
+            "new x(1);",
+            "new function(foo) {\n    this.foo = foo;\n}(1);",
+            "new true;",
+            "new 0;",
+            "new (!0);",
+            "new (bar = function(foo) {\n    this.foo = foo;\n})(123);"
+        ];
+        for (var i = 0; i < tests.length; i++) {
+            assert.strictEqual(
+                uglify.minify(tests[i], {
+                    fromString: true,
+                    output: {beautify: true},
+                    compress: false,
+                    mangle: false
+                }).code,
+                expected[i]
+            );
+        }
+    });
+});
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