Comment (by Roland Haas):

@Zach Etienne says (private chat message) he has merged the wvuthorns_diagnostics changes. From the looks of it this has been applied as git hash 25d9c18 "Merged in rhaas/cctkarguments (pull request #8)" of wvuthorns_diagnostics

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2384/cctkh-includes-cctk_argumentsh