// expect: 0 1 0 1 0 1/
// spec 4.10.3: no collection runs inside an o3 region; an allocation that would collect grows the heap, and leaving the outermost region runs the pending collection once
include rt;
word sink;
int inside;
o3 int churn(int n) {
	int i = 0;
	while (i < n) { sink = rt.new(64); i++; }
	rt.gc();
	return 0;
}
int early(int base) {
	o3 {
		int i = 0;
		while (i < 20000) { sink = rt.new(64); i++; }
		rt.gc();
		inside = rt.gc_runs - base;
		return 0;
	}
	return 1;
}
fn main() {
	int before = rt.gc_runs;
	o3 {
		int i = 0;
		while (i < 20000) { sink = rt.new(64); i++; }
		inside = rt.gc_runs - before;
	}
	rt.put_n(inside); rt.put_c(32); rt.put_n(rt.gc_runs - before); rt.put_c(32);
	before = rt.gc_runs;
	churn(20000);
	rt.put_n(0); rt.put_c(32); rt.put_n(rt.gc_runs - before); rt.put_c(32);
	before = rt.gc_runs;
	early(before);
	rt.put_n(inside); rt.put_c(32); rt.put_n(rt.gc_runs - before);
	rt.put_c(10);
	return 0;
}
// zc0: skip