p |OP * |my_attrs |OP *o|OP *attrs
p |void |boot_core_xsutils
#if defined(USE_ITHREADS)
+p |PERL_CONTEXT*|cx_dup |PERL_CONTEXT* cx|I32 ix|I32 max
+p |PERL_SI*|si_dup |PERL_SI* si
+p |ANY* |ss_dup |ANY* ss|I32 ix|I32 max
p |HE* |he_dup |HE* e|bool shared
p |REGEXP*|re_dup |REGEXP* r
p |PerlIO*|fp_dup |PerlIO* fp|char type