declare
     c sys_refcursor;
     s varchar2(4000);
begin
     execute immediate 'call function_returning_sys_refcursor() into :1' using out c;
     execute immediate 'select dump(:x) from dual' into s using c;
     dbms_output.put_line('s="' || s || '"');
end;
s="Typ=102 Len=4: 0,0,0,0"