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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity alu is
port (
a : in std_logic;
b : in std_logic;
y : out std_logic
);
end alu;
architecture mux of alu is
signal mux1: std_logic_vector(7 downto 0);
begin
process(a, b)
begin
y <= mux1(a & b); -- now allowed
end process;
end mux;
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