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diff --git a/tests/sva/basic05.vhd b/tests/sva/basic05.vhd
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+library ieee;
+use ieee.std_logic_1164.all;
+
+entity demo is
+	port (
+		clock : in std_logic;
+		ctrl : in std_logic;
+		x : out std_logic
+	);
+end entity;
+
+architecture rtl of demo is
+	signal read : std_logic;
+	signal write : std_logic;
+	signal ready : std_logic;
+begin
+	process (clock) begin
+		if (rising_edge(clock)) then
+			read <= not ctrl;
+			write <= ctrl;
+			ready <= write;
+		end if;
+	end process;
+
+	x <= read xor write xor ready;
+end architecture;