0x00 and 0xFF give IndexOutOfBounds errors

[bder]

module 0x00(output out, input in1, in2, in3);
always@(in1, in2, in3)
begin
case({in1,in2,in3})
3'b000: out = 1'b0;
3'b001: out = 1'b0;
3'b010: out = 1'b0;
3'b011: out = 1'b0;
3'b100: out = 1'b0;
3'b101: out = 1'b0;
3'b110: out = 1'b0;
3'b111: out = 1'b0;
default: out = 1'b0;
endcase
end
endmodule

module 0xFF(output out, input in1, in2, in3);
always@(in1, in2, in3)
begin
case({in1,in2,in3})
3'b000: out = 1'b1;
3'b001: out = 1'b1;
3'b010: out = 1'b1;
3'b011: out = 1'b1;
3'b100: out = 1'b1;
3'b101: out = 1'b1;
3'b110: out = 1'b1;
3'b111: out = 1'b1;
default: out = 1'b0;
endcase
end
endmodule