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If you are using a negative integer as your %BY value and you cross
from a positive value to a negative value without hitting zero, you
will receive the following errors:

ERROR: The current value of the %DO loop index variable I is 1;
       the by value is -2; an overflow
       will occur at the next evaluation with a value of -1.
ERROR: Overflow has occurred; evaluation is terminated.
ERROR: The macro TEST will stop executing.

The sample code below causes the errors above:

   %macro test;
      %do i=3 %to -1 %by -2;
       %put i=&i;
     %end;
   %mend test;
   %test

There is no efficient workaround for this problem.

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