/* n_8.t:   #error directive.   */

/* 8.1: Argument of #error directive is not a subject of macro expansion.

    Output to stderr as an example:

        Preprocessing error directive: MACRO is not a positive number.

        from line 10 of file "n_8.t"

 */

#define MACRO   0

#if MACRO <= 0

#error MACRO is not a positive number.

#endif