Probably comes down to your definition of a systems language. E.g. if that means implementing low level things like cryptography APIs, or being able to define

Probably comes down to your definition of a systems language. E.g. if that means implementing low level things like cryptography APIs, or being able to define the exact memory layout of objects in memory or access raw pointers or write ASM inline then obviously that disqualifies ruby, python and js but it would mean Go qualifies.