Section 8,7: Scalar_Reference

 A scalar reference is a scalar variable, scalar record field, array
 element, constant, character substring, or expression that resolves
 into a single, typed data item.  For example:

 Data Declarations:

    INTEGER INT, INTARY (10)
      . . .
    STRUCTURE /STRA/
        INTEGER  INTFLD, INTFLDARY (10)
    END STRUCTURE
      . . .
    STRUCTURE /STRB/
        CHARACTER*20  CHARFLD
        INTEGER  INTFLD, INTFLDARY (10)
        STRUCTURE STRUCFLD
            COMPLEX  CPXFLD, CPXFLDARY (10)
        END STRUCTURE
        RECORD  /STRA/  RECFLD, RECFLDARY (10)
    END STRUCTURE
      . . .
    RECORD  /STRB/  REC, RECARY (10)

 Reference Examples:

    INT --- Numeric variable
    INTARY(1) --- Numeric array element
    REC.INTFLD --- Numeric field
    REC.INTFLDARY(1) --- Numeric element of an array field
    CHARVAR(5:10) --- Substring expression of a character variable
    REC.CHARFLD(5:10) --- Substring expression of a character field

 Note:  A scalar memory reference is the same as a scalar reference,
 excluding constants, character substrings, and expressions.