Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Migration Guide

IBM2626: SUBSTR with a zero length

If you have some especially poor code, you may also now see this message:

  IBM2626I W   Use of SUBSTR with a third argument equal to 0 is
               somewhat pointless since the result will always be a
               null string.

If the compiler flags any if your code with this message, it has almost certainly found an error in your code that you should promptly fix.


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