// Intersects reports whether this points-to set and the
// argument points-to set contain common members.
func (x PointsToSet) Intersects(y PointsToSet) bool {
if x.pts == nil || y.pts == nil {
return false
}
// This takes Θ(|x|+|y|) time.
var z intsets.Sparse
z.Intersection(&x.pts.Sparse, &y.pts.Sparse)
return !z.IsEmpty()
}