human
Solve the following python programming problem given the following code:
def inject_fixture(request, arg, value) : 
    'Inject fixture into pytest fixture request.

    :param request: pytest fixture request
    :param arg: argument name
    :param value: argument value
    ' 
    fd = python.FixtureDef (fixturemanager = request._fixturemanager, baseid = None, argname = arg, func = (lambda : value), scope = 'function', params = None, yieldctx = False) 
    fd.cached_result = (add_fixturename, 0, None) 
    old_fd = getattr (request, '_fixturedefs', { 
        
}).get (arg) 
    old_value = request._funcargs.get (arg) 
    add_fixturename = (arg not in request.fixturenames) 
    def fin() : 
        request._fixturemanager._arg2fixturedefs [arg].remove (fd) 
        getattr (request, '_fixturedefs', { 
            
}) [arg] = old_fd 
        request._funcargs [arg] = old_value 
        if add_fixturename : 
            request.fixturenames.remove (arg) 
request.addfinalizer (fin) 
    request._fixturemanager._arg2fixturedefs.setdefault (arg, []).insert (0, fd) 
    getattr (request, '_fixturedefs', { 
        
}) [arg] = fd 
    request._funcargs [arg] = value 
    if add_fixturename : 
        request.fixturenames.append (arg) 

    
    

    Fix the buggy line: fd.cached_result = (add_fixturename, 0, None)
assistant
#Here is Python code to fix the buggy line: fd.

fd.cached_result = (value, 0, None)