human
Solve the following python programming problem given the following code:
def decorator(caller) : 
    '
    General purpose decorator factory: takes a caller function as
    input and returns a decorator with the same attributes.
    A caller function is any function like this::

     def caller(func, *args, **kw):
         # do something
         return func(*args, **kw)

    Here is an example of usage:

    >>> @decorator
    ... def chatty(f, *args, **kw):
    ...     print("Calling %r" % f.__name__)
    ...     return f(*args, **kw)

    >>> chatty.__name__
    \'chatty\'

    >>> @chatty
    ... def f(): pass
    ...
    >>> f()
    Calling \'f\'

    decorator can also take in input a class with a .caller method.
in this
    case it converts the class into a factory of callable decorator objects.
    See the documentation for an example.
    ' 
    if inspect.isclass (caller) : 
        return decorator_factory (caller) 
def _decorator(func) : 
        infodict = getinfo (func) 
        argnames = infodict ['argnames'] 
        assert (not (('_call_' in argnames) or ('_func_' in argnames))), 'You cannot use _call_ or _func_ as argument names!' 
        src = ('lambda %(signature)s: _call_(_func_, %(signature)s)' % infodict) 
        dec_func = eval (src, dict (_func_ = func, _call_ = caller)) 
        return update_wrapper (dec_func, func, infodict) 
return update_wrapper (_decorator, _decorator) 

    
    

    Fix the buggy line: return update_wrapper (_decorator, _decorator)
assistant
#Here is Python code to fix the buggy line: return update_wrapper (_decorator, _decorator)
.

return update_wrapper (_decorator, caller)