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library ieee;
use ieee.std_logic_1164.all;
library alib;
entity tb4 is
end;
architecture arch of tb4 is
signal a, b : std_logic := '0';
component acomp is
port (x: in std_ulogic; y: out std_ulogic);
end component;
begin
ainst: acomp
port map (a, b);
process is
begin
a <= '0';
wait for 1 ns;
assert b = '0' report "component is missing" severity failure;
a <= '1';
wait for 1 ns;
assert b = '1' report "component is missing" severity failure;
wait;
end process;
end architecture;
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