Logical names are defined at execution time (runtime) and not
       during the compilation phase. If you define a logical name
       within a statement, the logical name is not translated during
       the compilation phase, consequently it is executed without being
       defined, which will lead to an error.

       DTR> READY YACHTS
       DTR> BEGIN
       [Looking for statement]
       CON> FN$CREATE_LOG("FORM_DIR","DTR$LIBRARY:FORMS");
       CON> FOR X IN YACHTS
       [Looking for statement]
       CON> WITH_FORM YACHT IN FORM_DIR
       [Looking for SEND or RECEIVE statement]
       CON> SEND FROM X TO BOAT;
       CON> END
       Error opening DECforms form file DISK:[DALFY]FORM_DIR.EXE; .