Kernrechtsfrage
Whether the appeal remained admissible after the applicant acquired Swiss citizenship through adoption during the proceedings.
Extrahierter Entscheid
The appellant's current and practical interest ceased because he became a Swiss citizen, so the appeal had become moot and had to be struck from the docket.
Extrahierte Begründung
A current practical interest is required until the Federal Supreme Court decides. The post-judgment adoption directly removed the need for a residence permit and eliminated the subject matter of the dispute; no exceptional point of principle justified deciding the case anyway.