yosys/tests/opt/bug2221.ys

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read_verilog <<EOT
module test (
input [1:0] a,
input [1:0] b,
output [5:0] y
);
wire [5:0] aa = {a, 4'h0};
wire [5:0] bb = {b, 4'h0};
assign y = aa * bb;
endmodule
EOT
equiv_opt -assert opt_expr