def _trace_apply(self, chunkstr, verbose):
        print('# Input:')
        print(chunkstr)
        for rule in self._rules:
            rule.apply(chunkstr)
            if verbose:
                print('#', rule.descr()+' ('+unicode_repr(rule)+'):')
            else:
                print('#', rule.descr()+':')
            print(chunkstr)
Apply each rule of this ``RegexpChunkParser`` to ``chunkstr``, in
dataset/ETHPy150Open nltk/nltk/nltk/chunk/regexp.py/RegexpChunkParser._trace_apply