Error using sample code in favicon documentation

[AluminumAngel]

The code sample gives the assert view_func is not None, "expected view func if endpoint is not provided.".

Documentation in question: https://flask.palletsprojects.com/en/stable/patterns/favicon/

Sample code in question:

app.add_url_rule('/favicon.ico',
                 redirect_to=url_for('static', filename='favicon.ico'))

[AluminumAngel]

Issue is resolved by adding an endpoint parameter to the add_url_rule call.

Perhaps the documentation needs to be updated. Or there is something else wrong with my test case.