Question juridique clé
Whether the appeal in public law matters was admissible despite the immigration nature of the case.
Solution extraite
The appeal was admissible because the applicant could invoke a potential right under Art. 50 LEtr; the merits question belonged to the substance, not admissibility.
Motifs extraits
Where Art. 50 LEtr may confer a right to continued residence after dissolution of the family, federal review is open under Art. 83 let. c ch. 2 LTF.