Australia has a system of mandatory detention for illegal arrivals. Anyone found to be here illegally is put into a detention centre until their application for residency is finalised.
It's a policy which comes under constant criticism from the left. Because of endless appeals some people end up staying in detention for long periods.
At least, though, mandatory detention solves the kind of situation Sweden finds itself in. In Sweden asylum seekers who have their applications rejected can simply disappear into the community.
What solution is Sweden having to resort to? The Swedish government is planning to offer an amnesty to allow such people to stay.
So the whole system breaks down. You can arrive in Sweden illegally, claim to be a refugee, have your application rejected, disappear into the community and still be rewarded with an "amnesty" and be allowed to stay.
It is effectively a situation which the government no longer controls: the illegal arrivals do.
It's a warning that Australia should not follow such a model by releasing everyone who arrives here illegally into the general community.