求助：一个数组定义，老是提示缺少is

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity zdshj is
port(clk:in std_logic;
     set,buy,sel,finish:in std_logic;
          coin1,coin5:in std_logic;
          money1,money5:out std_logic;
          price,quantity:in std_logic_vector(3 downto 0);
          display,act:out std_logic_vector(3 downto 0);
          y0,y1:out std_logic_vector(6 downto 0));
end zdshj;
architecture behav of zdshj
#type ram_type is array(3 downto 0)of std_logic_vector(7 downto 0)
#signal ram:ram_type;
signal clk1:std_logic;
signal item:std_logic_vector(1 downto 0);
signal cnt:std_logic_vector(3 downto 0);
signal pri,qua:std_logic_vector(3 downto 0);
begin
P0:process(set,clk1)
variable quan:std_logic_vector(3 downto 0);
begin
if set='1' then
        ram(conv_integer(item))<=price & quantity;
        act<="0000";
elsif clk1'event and clk1='1' then
        money1<='0';
        money5<='0';
        if coin1='1' then
                if cnt<"1001" then
                        cnt<=cnt+1;
                else
                        cnt<="0000";
                end if;
        elsif coin5='1' then
                if cnt<"1001" then
                        cnt<=cnt+5;
                else
                        cnt<="0000";
                end if;
   elsif sel='1' then
           item<=item+1;
   elsif get='1' then
           if qua>"0000" and cnt>=pri then
                   cnt<=cnt-pri;
                   quan:=quan-1;
                   ram(conv_integer(item))<=pri & quan;
                   if item="00" then
                           act<="1000";
                   elsif item="01" then
                           act<="0100";
                   elsif item="10" then
                           act<="0010";
                   elsif item="11" then
                           act<="0001";
                   end if;
           end if;
   elsif finish='1' then
      if cnt>"0101" then
              money5<='1';
                   cnt<=cnt-5;
           elsif cnt>"0000" then
              money1<='1';
                   cnt<=cnt-1;
           else
              money5<='0';
                   money1<='0';
           end if;
   elsif get='0' then
      act<="0000";
           for i in 4 to 7 loop
           pri(i-4)<=ram(conv_integer(item))(i);
           end loop;
                for i in 0 to 3 loop
                quan(i)=:ram(conv_integer(item))(i);
                end loop;
        end if;
end if;
qua<=quan;
end process P0;

m50:process(clk)
variable Q:std_logic_vector(24 downto 0);
begin
if clk'event and clk='1' then
   Q=:Q+1;
end if;
if Q="1011111010111100000111111" then
   clk1<='1';
else
   clk1<='0';
end if;
end process m50;

code0:process(item)
begin
case item is
  when "00"=> display0<="0111";
  when "01"=> display0<="1011";
  when "10"=> display0<="1101";
  when others=> display0<="1110";
end case;
end process code0;

code1:process(cnt)
begin
case cnt is
  when "0000"=>y0<="0000001";
  when "0001"=>y0<="1001111";
  when "0010"=>y0<="0010010";
  when "0011"=>y0<="0000110";
  when "0100"=>y0<="1001100";
  when "0101"=>y0<="0100100";
  when "0110"=>y0<="0100000";
  when "0111"=>y0<="0001111";
  when "1000"=>y0<="0000000";
  when "1001"=>y0<="0000100";
  when others=>y0<="1111111";
end case;
end process code1;

code2:process(qua)
begin
case
  when "0000"=>y1<="0000001";
  when "0001"=>y1<="1001111";
  when "0010"=>y1<="0010010";
  when "0011"=>y1<="0000110";
  when "0100"=>y1<="1001100";
  when "0101"=>y1<="0100100";
  when "0110"=>y1<="0100000";
  when "0111"=>y1<="0001111";
  when "1000"=>y1<="0000000";
  when "1001"=>y1<="0000100";
  when others=>y1<="1111111";
end case;
end process code2;
end behav;