Out Of Memory in the engine

[W95Psp]

If an OOM happens in the engine, it seems like OCaml just exits with 1 with no error message at all.

That's an issue because that's probably a specific phase that crashed. We want to have information about that phase.

Possible solutions:

• https://ocaml.org/manual/5.2/api/Stdlib.html at_exit, hook something to catch an error (we could register a callback when running a phase only, or just deregister the callback when exiting normally)
• detect exit one in the Rust cli, and display a message saying that's probably an OOM, and re-run with --stats to get an idea of what phase failed

[franziskuskiefer]

Is this related to #1033?

[W95Psp]

Probably, yes! Thanks for linking it!