2 Cannot compare function to 0.
10 /* compare function pointer to non-zero integer literal */
11 return a
!= 1; /* ERROR */
18 /* compare function pointer to 0 with an operator other than ==,!= */
19 return a
>= 0; /* ERROR */
26 /* compare function pointer to 0 with an operator other than ==,!= */
27 return a
< 0; /* ERROR */