There exist a number of definitions in kernels that aren't part of the kernels themselves, but are used in them. A list of their header files are below:

• accessor.h
• allocation.h
• array_shape.h
• datatype_dispatch.h
• legion_dim.h (and its interaction with ff_dim_t)
• perf_metrics.h
• per_device_op_state.h
• profiling.h

The code in these files has not been updated in a while, and may not have been fully implemented. Update this code (for example, FF_VISITABLE_STRUCT instead of use_visitable_cmp), make sure it's implemented, determine what makes sense to test, and write the corresponding unit tests using a mix of doctest and rapidcheck (see #870 for good examples of rapidcheck tests--also note that we have support in visitable for rapidcheck)