Falha no procedimento simples do Oracle

create or replace procedure testsproc
    ( username in varchar2 )
as
    resultset sys_refcursor;
begin
    open resultset for
        select * from test_table 
        where  name = username;

    dbms_sql.return_result(resultset);
end testsproc;

exec testsproc('Phil')

call testsproc('Phil');

begin
    testsproc('Phil');
end;