Questione giuridica chiave
Whether the constitutional complaint was admissible despite no entitlement to renewal of the residence permit.
Decisione estratta
No. Without a legally protected interest in the renewal decision, the appellant lacked standing to raise arbitrary-treatment grievances.
Motivazione estratta
The appellant had no statutory or treaty-based right to renewal; therefore public-law appeal was unavailable and subsidiary constitutional complaint was limited by Art. 115 lit. b BGG to legally protected interests, which were absent.