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Library ieee;
use ieee.std_logic_1164.all;
entity ex4 is
end entity;
architecture tb of ex4 is
signal a,b : std_logic := '0';
signal clk_sys : std_logic;
default clock is rising_edge(clk_sys);
begin
gen_clock_proc : process
begin
clk_sys <= '1';
wait for 5 ns;
clk_sys <= '0';
wait for 5 ns;
end process;
test_proc : process
begin
a <= '1';
wait for 50 ns;
std.env.finish;
end process;
my_seq : assert never {a = '1'; b = '1'}[->3];
end architecture tb;
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