Keep happens before the rename.
Keep happens before the rename.
Keep happens before the rename.
There. Now I won't forget.
A little test code to prove it:
data test;
length x y z $5;
run;
data test;
set test(keep=x y z rename=(x=x2));
run;
data test;
length x y z $5;
run;
data test;
set test(keep=x y z rename=(x=x2));
run;