Comment (by Roland Haas):

Hmm, apparently in https://bitbucket.org/cactuscode/cactus/pull-requests/12/fixes-to-allow-compilation-with-clang-on/diff I was the reviewer and approved. I will apply after 2019-12-12 unless objected.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/1933/cactus-does-not-compile-with-clang-on