[aw1621107]

> I thought destructors were all noexcept now...

Destructors are noexcept by default, but that can be overridden with noexcept(false).

> or at the very least if you didn't noexcept, and then threw something, it just killed the process.

IIRC throwing out of a destructor that's marked noexcept(false) terminates the process only if you're already unwinding from something else. Otherwise the exception should be thrown "normally".