[zero_bias]

In rust you could use multiple allocators at the same time. Allocation failure handled by allocator, converting panic to some useful behavior. This logic is observable in WASM, as there are OOMs all the time, which handled transparently to application code

So I assume there is no real blockers as people in this tread assume, this is just not a conventional behavior, ad hoc, so we need to wait and well defined stable OOM handlers will appear