terminal - 在 SRFF 终端的测试台中显示错误“; 应该是标识符而不是标识符

Question

我在这个 SR FF 的测试平台中发现了这个错误。
当我在终端中使用 GHDL 编译它时，它显示错误

; 预计而不是 ''

我只是一个初学者，所以我找不到错误。
谁能帮帮我吗？

library ieee;
use ieee.std_logic_1164.all;

entity SR_tb is
end SR_tb;

architecture behavioral of SR_FF is
    component SR_FF is
        port  (S,R,CLOCK:in std_logic;
        Q,QBAR:out std_logic);  
    end component;
signal clock,s,r,q,qbar: std_logic;
constant clock_period : time := 10 ns;
begin
    port_map:SR_FF port map (clock=>CLOCK,s=>S,r=>R,q=>Q,qbar=>QBAR);

clock_process:process
 begin
      clock <='0';
      wait for clock_period/2;
      clock <= '1';
      wait for clock period/2;
end process;
stim_proc:process
begin 
       s<= '0';
        r<= '0';
        wait for 50 ns;   
        s<= '0';
        r<= '1';
        wait for 50 ns;
        s<= '1';
        r<= '0';
        wait for 50 ns;
        s<= '1';
        r<= '1';
        wait for 50 ns;
assert false report "reached end of test";
wait;
end process;

end behavioral;