// new stamps the header, so an o3 caller and an ordinary caller both see a type.
// the call itself is not a boundary: no fatten, and the callee's prologue does not run.
struct node { int v; node* c; };
unchecked o3 node* leaf(int v) {
	node* n = new(node);
	n.v = v; n.c = 0;
	return n;
}
unchecked o3 int inner() {
	node* n = leaf(7);
	int* p = n;
	return p[-1];
}
unchecked o3 int add(int a, int b) { return a + b; }
unchecked o3 int nest(int n) {
	if (n == 0) return 0;
	return n + nest(n - 1);
}
unchecked fn main() {
	node* n = leaf(4);
	int* p = n;
	put_n(p[-1] < 0); put_c(' ');
	put_n(inner() < 0); put_c(' ');
	put_n(n.v); put_c(' ');
	put_n(add(20, 3)); put_c(' ');
	put_n(nest(10)); put_c(' ');
	tprint(typeof_obj(n)); put_c(10);
	return 0;
}