C++ signal connection to script function does work in Qt 4.6 as documented

In http://doc.trolltech.com/4.6/scripting.html#using-signals-and-slots, there are snippets how to connect C++ signals to to script funtions. Those snippets work fine in Qt 4.5.x, but not in Qt 4.6.0. The problem seem to be in syntax how script function is defined:

For example, the following does not work in 4.6:

QScriptValue handler = eng.evaluate("function(text) { print('text was changed to', text); }");
qScriptConnect(edit, SIGNAL(textChanged(const QString &)), QScriptValue(), handler);

But adding the parenthesis () around the evaluated sentence, makes the example work again 4.6 (it works also in 4.5):

QScriptValue handler = eng.evaluate("(function(text) { print('text was changed to', text); })");
qScriptConnect(edit, SIGNAL(textChanged(const QString &)), QScriptValue(), handler);

Should evaluation work without parenthesis? I assume this differenece is due to QtScript backend change to javascriptcore..