read_rtlil << EOF

module \top

  wire width 4 input 1 \A

  wire output 2 \Y

  cell $lut \lut
    parameter \LUT 16'1111110011000000
    parameter \WIDTH 4
    connect \A \A
    connect \Y \Y
  end
end

EOF

equiv_opt -assert opt_lut_ins

design -load postopt

select -assert-count 1 t:$lut r:WIDTH=3 %i