I believe this is actually independent of being in a for loop.  Your first
line corresponds to code like this:

int i;
i=0, int m=0;

Which is syntactically incorrect.

Your second example corresponds to this:

int i;
int m=0, i;

Which is an attempt to re-declare i.

So you're correct; you can't have both an old variable and a new variable in
the for loop initialization.

-BJ
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