Windows 32bit/MSVC2015/Update 3/Release mode: tst_qjsengine crash

    qputenv("QV4_FORCE_INTERPRETER", "1");
    QCoreApplication app(argc, argv);
    const QString code = "var a = {'0':'#','2':'#','5':'#','8':'#','6':'#','12':'#','13':'#','16':'#','18':'#','39':'#'}";
    QJSEngine eng;
    QJSValue ret = eng.evaluate(code, /*fileName =*/QString(), 1);

A crash occurred in C:\Users\qt\work\qt\qtdeclarative\tests\auto\qml\qjsengine\release\tst_qjsengine.exe.
Function time: 24ms Total time: 195ms

Exception address: 0x69EE72E8
Exception code   : 0xc0000005
Nearby symbol    : QV4::SparseArray::insert

Stack:
#  1: QTest::toString() - 0x6ABC9560