Question juridique clé
Whether the federal appeal is admissible under Art. 83 let. c ch. 2 LTF
Solution extraite
The appeal was admissible because the appellant plausibly invoked a potential entitlement under Art. 50 LEI; the merits of whether the entitlement actually exists are separate from admissibility.
Motifs extraits
A colorable claim under Art. 50 para. 1 let. a or b LEI is sufficient to open the way to public-law appeal; the extreme-hardship question belongs to the merits.