I think you will notice that each of those variables is assigned to the true name within a few lines of the declaration. n->For.init = i; n->For.step = st; ...

I think you will notice that each of those variables is assigned to the true name within a few lines of the declaration. n->For.init = i; n->For.step = st; ... This is why it is clear. Though I could change it to be better.