#486 set out to change the Kinds of ASTs, but due to some unforeseen downstream impacts of doing so, decided to instead introduce an error functor, a solution to report parse errors in the interim. This changed ASTs. While tagging and other higher priority dependencies were updated, Core and related modules were elided in that PR. Upon merge, semantic will not compile any Core modules (they're temporarily commented out). Therefore we should come back and re-enable these once we've settled on adjusting the Kinds of ASTs.