Comment (by Roland Haas):

A real world example of this is SphericalSurface which contains:

CCTK_REAL sf_radius[nsurfaces] TYPE=array DIM=2 SIZE=maxntheta,maxnphi DISTRIB=constant

which is an vector of grid arrays.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2366/support-vectors-of-grid-arrays-in-checked