Multiple alias this You can only have one subtyping member currently.Shared Not all of shared's guarantees are implemented yet.SafeD@safe (and therefore SafeD) isn't fully implemented. So, it doesn't necessarily work quite like it's supposed to yet.How much of these are relevant today with 2.077.0?
The first two are true AIUI. @safe is mostly implemented, there's been a lot of progress on that since TDPL.
