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

 Message        "<C++ keyword>" is a keyword in C++.  Using it as an
                identifier in your C program will prevent porting
                your program to C++.

 Description    This identifier is a keyword in C++.  The program is,
                therefore, not a valid C++ program.

 User Action    Choose a different name for the identifier.