Sub bus of an internal node may not be used

[hemasaad]

why I get this error (Sub bus of an internal node may not be used) when I write this code
Or8Way(in=lastout[0..7], out=out1);
Or8Way(in=lastout[8..15], out=out2);
Or(a=out1, b=out2, out=out3);
where already I use the all bus of the internal node. all I need to do is Oring bus of 16 bit by Or8Way.

[cadet1620]

You need to create internal buses the same size that they are going to be used.

In this case, you have
    Somepart(..., out=lastout);
You need to change that to
    Somepart(..., out[0..7]=lastout1, out[8..15]=lastout2);
so that you can use lastout1 and lastout2 in the Or8Ways.

--Mark

[hemasaad]

Thank you cadet1620. I did it and The ALU chip could pass the test.