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entity tb2 is
end tb2;
architecture behav of tb2 is
signal s : bit;
signal clk : bit;
begin
-- psl default clock is (clk'event and clk = '1');
postponed assert always {s = '0'; s = '1'} severity failure;
process
begin
s <= '1';
wait for 0 ns;
s <= '0';
wait;
end process;
end behav;
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