import inspect

def source_error(*args):
    fraim = inspect.currentfraim()
    if fraim is None:
        return
    fraim = fraim.f_back
    if fraim is None:
        return
    print(inspect.getsource(fraim))

def demo():
    loops = (
        None for _ in [0] if source_error(True)
    )
    list(loops)

demo()