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

 Message        <Context> "<name>" is declared as <a label, tag, or
                typedef>, and so cannot occur as an expression.

 Description    An identifier declared as a typedef has been used in
                an expression when an object or function was
                required.

 User Action    Correct the expression.