v2.1.9

we do need parens here: `new (foo.bar().baz)`, but not here: `new foo.bar.baz`

lib/output.js

@@ -470,7 +470,22 @@ function OutputStream(options) {
 
     PARENS(AST_PropAccess, function(output){
         var p = output.parent();
-        return p instanceof AST_New && p.expression === this;
+        if (p instanceof AST_New && p.expression === this) {
+            // i.e. new (foo.bar().baz)
+            //
+            // if there's one call into this subtree, then we need
+            // parens around it too, otherwise the call will be
+            // interpreted as passing the arguments to the upper New
+            // expression.
+            try {
+                this.walk(new TreeWalker(function(node){
+                    if (node instanceof AST_Call) throw p;
+                }));
+            } catch(ex) {
+                if (ex !== p) throw ex;
+                return true;
+            }
+        }
     });
 
     PARENS(AST_Call, function(output){

package.json

@@ -3,7 +3,7 @@
     "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
     "homepage": "http://lisperator.net/uglifyjs",
     "main": "tools/node.js",
-    "version": "2.1.8",
+    "version": "2.1.9",
     "engines": { "node" : ">=0.4.0" },
     "maintainers": [{
         "name": "Mihai Bazon",