Recategorizing Compiler-Exceptions protocols

Short question: Is it intended that {Parser, SyntaxError}Notification >> #defaultAction are *not* located in the Compiler package but in extension categories from System? It looks a bit confusing.

mt 9/17/2019 10:09 · *System-exceptionDescription · 67 implementors · only in change set System-mt.1093

Best,

Christoph