Article L5214-21 of the French General Code of Local Authorities
I. – The community of communes whose perimeter is identical to that of a syndicate of communes or a mixed syndicate is substituted ipso jure for that syndicate of communes or that mixed syndicate for all the competences that they exercise. The community of communes is also substituted ipso jure, for the competences that it exercises or comes to exercise, for the syndicate of communes or the mixed syndicate included…