human
Solve the following python programming problem given the following code:
@ pytest.fixture 
def app(request, manager, watcher) : 
    app = App ().register (manager) 
    assert watcher.wait ('registered') 
    def finalizer() : 
        app.unregister () 
request.addfinalizer (request) 
    return app 

    
    

    Fix the buggy line: request.addfinalizer (request)
assistant
#Here is Python code to fix the buggy line: request.

request.addfinalizer (def finalizer()