+PERL_CALLCONV void Perl_sv_insert_flags(pTHX_ SV *const bigstr, const STRLEN offset, const STRLEN len, const char *const little, const STRLEN littlelen, const U32 flags)
+ __attribute__nonnull__(pTHX_1)
+ __attribute__nonnull__(pTHX_4);
+#define PERL_ARGS_ASSERT_SV_INSERT_FLAGS \
+ assert(bigstr); assert(little)
+
+PERL_CALLCONV int Perl_sv_isa(pTHX_ SV* sv, const char *const name)