dec38419cd
Caused by 45f231141d.
The problem was that the now non-trivial PointerRNA type was used inside
of a union. To fix that, replace it with a variant, and generally move
the file towards proper C++ patterns. Also replace the memory arena with
a ResourceScope, of change from dynstr to the fmt::memory_buffer, and
use a destructor instead of manually freeing memory.
Pull Request: https://projects.blender.org/blender/blender/pulls/134144