Example:

          LOOP0 F S act=$O(^act(act)) Q:act="" B:debug D LOOP1
        

This FOR loop contains a BREAK with a command postconditional.

Example:

          B:$D(x) "W !,""OK""":x,"W !,""Wrong again""":'x
        

This uses a BREAK with both command and argument postconditionals. The actions display debugging messages.