Good question. I guess it's a question of if we have enough Anarki tests to minimze breaking changes.
If we do, then I don't know if it matters if we run unit-test.arc tests -- it's just one Arc library, presumably of several.
It's a little different than other libraries because it's what we use for Anarki unit tests.
Running it as part of Anarki's unit tests would prevent breakage, and is a simple solution to get a lot more tests added to the language. Anyone want to write a bunch of tests for Anarki itself?
Anarki isn't really intended to avoid or minimize breaking changes. The unit tests verify only that everything is internally consistent. That boundary around 'internal' should include unit-test.arc, I think.