yosys/tests/various/equiv_opt_undef.ys

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read_rtlil << EOT
module \top
wire $a
wire $b
wire input 1 \D
wire input 2 \EN
wire output 3 \Q
cell $mux $x
parameter \WIDTH 1
connect \A \Q
connect \B \D
connect \S \EN
connect \Y $a
end
cell $ff $y
parameter \WIDTH 1
connect \D $a
connect \Q $b
end
cell $and $z
parameter \A_SIGNED 0
parameter \A_WIDTH 1
parameter \B_SIGNED 0
parameter \B_WIDTH 1
parameter \Y_WIDTH 1
connect \A $b
connect \B 1'x
connect \Y \Q
end
end
EOT
equiv_opt -assert -undef ls