+Es |bool|could_it_be_a_POSIX_class|NN struct RExC_state_t *pRExC_state
+Es |regnode*|handle_regex_sets|NN struct RExC_state_t *pRExC_state \
+ |NULLOK SV ** return_invlist \
+ |NN I32 *flagp|U32 depth \
+ |NN char * const oregcomp_parse
+Es |void|parse_lparen_question_flags|NN struct RExC_state_t *pRExC_state