Mono crash when using recursive options in schema

[jamiebrynes7]

Affects: Release v0.2.3 and up (observed in Unity 2019.1.3)
Internal Ticket: UTY-2091

---

Description

Schema that attempts to use an option recursively:

type TypeA {
	option<TypeA> test = 1;
}

Will cause a Mono crash like the following:

* Assertion at ..\mono\metadata\class.c:1998, condition `image_is_dynamic (klass->image) || field_offsets [i] > 0' not met

Workaround

There is no workaround to allow recursive options, you can emulate this with a list with 0 or 1 elements. Support for reference-semantic options will enable this.

---

To get yourself back to a good state:

1. Remove the problematic schema entry.
2. Delete the Assets/Generated/Source directory.
3. Re-open Unity.

[jamiebrynes7]

Fixed in release v0.2.8