{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"self.words[start_word_index]"}]}
            self.words[start_word_index] |= !(start_mask - 1);
            // We set all leading bits. This includes the start_mask bit.
            // And all trailing bits (i.e. from 0..=end) in the end word,