[yetihehe]

> I wonder why other runtimes haven't adopted these features?

Probably mainly due to shared memory. When you know your data can be modified only in one place, changing data structure is easier. Try changing a struct when some other code is using it. It would require a lock for every object in memory.

[macintux]

One of the great things about Erlang and the BEAM is that by designing a very opinionated language around concepts like immutability and ubiquitous messaging between lightweight actors, you can define the VM to support those.

So there’s this collection of features between the language and VM that support each other, and are generally hard to reproduce outside that ecosystem because they are so interdependent.

[dnautics]

the fact that looping through a process is a tail call which by its very nature creates well-defined boundaries (both in "code segment" and in "data segment") also helps a gazillion. Try doing hot loading in the middle of a while loop... Not saying it's impossible, but you're not gonna have a good time.