nextpnr/fpga_interchange/examples/tests/lut_nexus/lut.v

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module top;
wire x, y;
(*keep*)
LUT4 lut_0(.A(x), .B(x), .C(x), .D(x), .Z(y));
(*keep*)
LUT4 lut_1(.A(y), .B(y), .C(y), .D(y), .Z(x));
endmodule