A piece of code that you see and wonder about, but that is actually invisible to the compiler, we can call it the ghost code:

int x = b/c;
// x *= 2
x += d;
return x;

Either delete that code – we have source control systems for seeing thing that are no longer current – or write why the code was commented out and when it will be uncommented:

int x = b/c;
// TODO: uncomment after implementing rule R-325
// x *= 2
x += d;
return x;

Code that is commented out adds unnecessary confusion.

W. Gdela