human
Solve the following python programming problem given the following code:
def copydoc(fromfunc, sep = '
') : 
    'Decorator: Copy the docstring of `fromfunc`

    If the doc contains a line with the keyword `ABSTRACT`,
    like `ABSTRACT: Needs to be defined in subclass`, this line and the line after are removed.

    ' 
    def _decorator(func) : 
        sourcedoc = fromfunc.__doc__ 
        split_doc = sourcedoc.split ('
') 
        split_doc_no_abstract = [line for line in split_doc if (not ('ABSTRACT' in line))] 
        if (len (split_doc) != len (split_doc_no_abstract)) : 
            sourcedoc = '
'.join (split_doc_no_abstract [: (- 1)]) 
if (func.__doc__ is None) : 
            func.__doc__ = sourcedoc 
else : 
            func.__doc__ = sep.join ([sourcedoc, func.__doc__]) 
return func 
return fromfunc 

    
    

    Fix the buggy line: return fromfunc
assistant
#Here is Python program to fix the buggy line: return fromfunc
.

return def _decorator(