为什么我得到“PLS-00302:必须声明组件‘表\名称’”?

我试图在Oracle 12.2 DB中创建一个相当简单的存储过程:

create or replace procedure list_tables (
    p_src_schema    varchar2
)
as
    l_src_schema    varchar2(30)    := upper(p_src_schema);
begin
    for x in (select table_name name from all_tables where owner = l_src_schema
              and not regexp_like(table_name, '(AAA|BKP_|LOG_|TMP_|TEST|XX).*')
              order by table_name)
    loop
        dbms_output.put_line(x.table_name);
    end loop;
end;
/
show errors

我得到以下错误:

LINE/COL ERROR
-------- -----------------------------------------------------------------
11/9     PL/SQL: Statement ignored
11/32    PLS-00302: component 'TABLE_NAME' must be declared

dbms_output.put_line(x.table_name);

问题: