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

RULES(NOMULTICLOSE)

The new and old compilers all allow you to close more than one DO, SELECT, BEGIN or PROCEDURE group with one END statement, although the new compiler will issue an I-level message.

However, closing multiple groups with one END statement is not a good programming practice, and the compiler option RULES(NOMULTICLOSE) allows you to force the compiler to flag such code with an E-level message. For example, under this option the compiler would object to the following code:

  a: do i = 1 to 17;
     b: do j = 1 to 29;
        t = x(i,j);         /* transpose i and j
        x(i,j) = x(j,i);
        x(j,i) = t;
     end b;              /* end of loop */
  end a;

Note that since the first comment is unclosed, the end a; closes both DO loops.


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