yosys/tests/opt/opt_expr_plus_assignment.ys

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read_verilog -sv <<EOT
module opt_expr_add_test(input [3:0] i, input [7:0] j, output [8:0] o);
wire[8:0] a = 8'b0;
initial begin
a += i;
a += j;
end
assign o = a;
endmodule
EOT
proc
equiv_opt -assert opt_expr -fine
design -load postopt
select -assert-count 1 t:$add r:A_WIDTH=9 r:B_WIDTH=8 r:Y_WIDTH=9 %i %i %i