// 1. This Fails:

volatile int rti = 1;
void main(void) {
    printf("rti = %d\n", rti);
}

// 2. This Presumably Works:

void main(void) {
    volatile int rti = 1;
    printf("rti = %d\n", rti);
}

// 3. So compare the ASM and see what's different