fn incr(& mutable int x) -> bool {
x += 1;
check (false);
ret false;
}
fn main() {
auto x = (1 == 2) || (3 == 3);
check (x);
let int y = 10;
log x || incr(y);
check (y == 10);
if (true && x) {
check (true);
} else {