61Indeed, the opportunities offered by the Treaty in relation to freedom of movement for citizens of the Union cannot be fully effective if a national of a Member State can be dissuaded from using them by obstacles resulting from his stay in another Member State, because of legislation of his State of origin which penalises the mere fact that he has used those opportunities (see, inter alia, judgment of 26 February 2015, Martens, C‑359/13, EU:C:2015:118, paragraph 26).
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