1 files changed, 64 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/bug1008339.js b/js/src/jit-test/tests/basic/bug1008339.js
new file mode 100644
index 0000000000..f253d6024c
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug1008339.js
@@ -0,0 +1,64 @@
+
+var count = 0;
+
+function Parent() {
+    // Scanning "this" properties here with Object.keys() solved the bug in my case
+    //Object.keys(this);
+
+    this.log('Parent ctor');
+    this.meth1();
+    this.log('data3 before : ' + this.data3);
+    this.meth2();
+    // Added properties lost in ChildA
+    this.log('data3 after : ' + this.data3);
+    this.log('');
+
+    if (count++)
+	assertEq(this.data3, 'z');
+}
+Parent.prototype.meth1 = function () {
+    this.log('Parent.meth1()');
+};
+Parent.prototype.meth2 = function () {
+    this.log('Parent.meth2()');
+    // Requirement for the bug : Parent.meth2() needs to add data
+    this.data4 = 'x';
+};
+Parent.prototype.log = function (data) {
+    print(data);
+}
+
+// Intermediate constructor to instantiate children prototype without executing Parent constructor code
+function ParentEmptyCtor() { }
+ParentEmptyCtor.prototype = Parent.prototype;
+
+function ChildA() {
+    this.log('ChildA ctor');
+    Parent.call(this);
+}
+ChildA.prototype = new ParentEmptyCtor();
+// Using Object.create() instead solves the bug
+//ChildA.prototype = Object.create(ParentEmptyCtor.prototype);
+ChildA.prototype.constructor = ChildA;
+ChildA.prototype.meth1 = function () {
+    this.log('ChildA.meth1()');
+    this.data3 = 'z';
+};
+ChildA.prototype.meth2 = function () {
+    this.log('ChildA.meth2()');
+};
+
+function ChildB() {
+    this.log('ChildB ctor');
+    Parent.call(this);
+}
+ChildB.prototype = new ParentEmptyCtor();
+//ChildB.prototype = Object.create(ParentEmptyCtor.prototype);
+ChildB.prototype.constructor = ChildB;
+
+function demo() {
+    // Requirement for the bug : ChildB needs to be instantiated before ChildA
+    new ChildB();
+    new ChildA();
+}
+demo();