PERL_CALLCONV OP * Perl_my_attrs(pTHX_ OP *o, OP *attrs);
PERL_CALLCONV void Perl_boot_core_xsutils(pTHX);
#if defined(USE_ITHREADS)
+PERL_CALLCONV PERL_CONTEXT* Perl_cx_dup(pTHX_ PERL_CONTEXT* cx, I32 ix, I32 max);
+PERL_CALLCONV PERL_SI* Perl_si_dup(pTHX_ PERL_SI* si);
+PERL_CALLCONV ANY* Perl_ss_dup(pTHX_ ANY* ss, I32 ix, I32 max);
PERL_CALLCONV HE* Perl_he_dup(pTHX_ HE* e, bool shared);
PERL_CALLCONV REGEXP* Perl_re_dup(pTHX_ REGEXP* r);
PERL_CALLCONV PerlIO* Perl_fp_dup(pTHX_ PerlIO* fp, char type);