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#include <stdio.h>
int main() {
...
    printf(foo);  /* compiler cannot inspect contents of foo */
    return 0;
}

$ gcc -Wformat -Wformat-security nonlit.c 
nonlit.c: In function 'main':
nonlit.c:5: warning: format not a string literal and no format argumen
+ts

SV* vec_zeros(int m) {
    int i;
...

    return Perl_newRV_noinc(((PerlInterpreter *)pthread_getspecific((*
+Perl_Gthr_key_ptr(((void *)0))))), (SV*) myav);
}