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cat top.v
module top (a, b, c, d);
...
buffer i_buffer (.in_b(b), .out_d(d));

endmodule

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%Error: top.v:10: Cannot find buffer
%Error: top.v:9: Cannot find inverter
...
    PinName=out_d NetName=d
    PinName=in_a NetName=a
    PinName=out_c NetName=c