human
Solve the following python programming problem given the following code:
def trace(* predicates, **options) : 
    '
    Starts tracing. Can be used as a context manager (with slightly incorrect semantics - it starts tracing
    before ``__enter__`` is called).

    Parameters:
        *predicates (callables): Runs actions if **all** of the given predicates match.
    Keyword Args:
        clear_env_var: Disables tracing in subprocess. Default: ``False``.
        threading_support: Enable tracing *new* threads. Default: ``False``.
        action: Action to run if all the predicates return ``True``. Default: ``CodePrinter``.
        actions: Actions to run (in case you want more than 1).
    ' 
    global _last_tracer 
    clear_env_var = options.pop ('clear_env_var', False) 
    threading_support = (options.pop ('threading_support', False) or options.pop ('threads_support', False) or options.pop ('thread_support', False) or options.pop ('threadingsupport', False) or options.pop ('threadssupport', False) or options.pop ('threadsupport', False) or options.pop ('threading', False) or options.pop ('threads', False) or options.pop ('thread', False)) 
    predicate = _prepare_predicate (* predicates, ** options) 
    if clear_env_var : 
        os.environ.pop ('PYTHONHUNTER', None) 
_last_tracer = Tracer (threading_support) 
    @ atexit.register 
    def atexit_cleanup(ref = weakref.ref (_last_tracer)) : 
        maybe_tracer = ref () 
        if (maybe_tracer is not None) : 
            maybe_tracer.stop () 
return _last_tracer.trace (predicates) 

    
    

    Fix the buggy line: return _last_tracer.trace (predicates)
assistant
#Here is Python code to fix the buggy line: return _last_tracer.

return _last_tracer.trace (predicate)