Case C-494/17: Judgment of the Court (First Chamber) of 8 May 2019 (request for a preliminary ruling from the Corte d’appello di Trento — Italy) — Ministero dell’Istruzione, dell’Università e della Ricerca — MIUR v Fabio Rossato, Conservatorio di Musica F.A. Bonporti (Reference for a preliminary ruling — Social policy — Fixed-term work — Contracts concluded with a public sector employer — Measures to penalise misuse of fixed-term employment contracts — Conversion of the employment relationship into a relationship of indefinite duration — Limitation on the retroactive effect of the conversion — No financial remedies)