implement private members, fixes #74

test/codegen/expect/isolate/isolate.js

Index: test/codegen/expect/isolate/isolate.js
diff --git a/test/codegen/expect/isolate/isolate.js b/test/codegen/expect/isolate/isolate.js
index 814ba242e6444b55c532e17a0da4aae5c1b9049c..e2abd8cb6ecf5890627373b9d12bd106170611f6 100644
--- a/test/codegen/expect/isolate/isolate.js
+++ b/test/codegen/expect/isolate/isolate.js
@@ -1,6 +1,9 @@
 var isolate;
 (function(exports) {
   'use strict';
+  let _pause = Symbol('_pause');
+  let _description = Symbol('_description');
+  let _trace = Symbol('_trace');
   class IsolateSpawnException extends dart.Object {
     IsolateSpawnException(message) {
       this.message = message;
@@ -57,10 +60,10 @@ var isolate;
         resumeCapability = null;
       if (resumeCapability === null)
         resumeCapability = new Capability();
-      this._pause(resumeCapability);
+      this[_pause](resumeCapability);
       return resumeCapability;
     }
-    _pause(resumeCapability) {
+    [_pause](resumeCapability) {
       let message = new core.List(3);
       dart.dsetindex(message, 0, "pause");
       dart.dsetindex(message, 1, this.pauseCapability);
@@ -177,19 +180,19 @@ var isolate;
   }
   class RemoteError extends dart.Object {
     RemoteError(description, stackDescription) {
-      this._description = description;
+      this[_description] = description;
       this.stackTrace = new _RemoteStackTrace(stackDescription);
     }
     toString() {
-      return this._description;
+      return this[_description];
     }
   }
   class _RemoteStackTrace extends dart.Object {
-    _RemoteStackTrace(_trace) {
-      this._trace = _trace;
+    _RemoteStackTrace($_trace) {
+      this[_trace] = $_trace;
     }
     toString() {
-      return this._trace;
+      return this[_trace];
     }
   }
   class Capability extends dart.Object {