VMS Help CC, Messages, ARRNOTLVALUE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> accepting a non-lvalue array in a subscript
                operator is an extension to the C89 standard.

 Description    The C89 standard states that one of the operands to
                the subscript operator must be a pointer.  However,
                the array used in this operator could not be
                converted to a pointer because it is not an lvalue.
                Therefore this code does not conform to the C89
                standard and may not be accepted by other compilers.
                Note that the C99 standard allows this because all
                arrays are converted to pointers, not just lvalue
                arrays.

 User Action    Be aware of this difference if you plan to port this
                source to another compiler.