diff -r 000000000000 -r 6474c204b198 js/src/jsapi-tests/testContexts.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jsapi-tests/testContexts.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jsapi-tests/tests.h"
+
+BEGIN_TEST(testContexts_IsRunning)
+    {
+        CHECK(JS_DefineFunction(cx, global, "chk", chk, 0, 0));
+        EXEC("for (var i = 0; i < 9; i++) chk();");
+        return true;
+    }
+
+    static bool chk(JSContext *cx, unsigned argc, jsval *vp)
+    {
+        JSRuntime *rt = JS_GetRuntime(cx);
+        JSContext *acx = JS_NewContext(rt, 8192);
+        if (!acx) {
+            JS_ReportOutOfMemory(cx);
+            return false;
+        }
+
+        // acx should not be running
+        bool ok = !JS_IsRunning(acx);
+        if (!ok)
+            JS_ReportError(cx, "Assertion failed: brand new context claims to be running");
+        JS_DestroyContext(acx);
+        return ok;
+    }
+END_TEST(testContexts_IsRunning)
+
+BEGIN_TEST(testContexts_bug563735)
+{
+    JSContext *cx2 = JS_NewContext(rt, 8192);
+    CHECK(cx2);
+
+    bool ok;
+    {
+        JSAutoRequest req(cx2);
+        JSAutoCompartment ac(cx2, global);
+        JS::RootedValue v(cx2);
+        ok = JS_SetProperty(cx2, global, "x", v);
+    }
+    CHECK(ok);
+
+    EXEC("(function () { for (var i = 0; i < 9; i++) ; })();");
+
+    JS_DestroyContext(cx2);
+    return true;
+}
+END_TEST(testContexts_bug563735)