Comment by chubot

That would be an odd choice for a low-level language ... languages like C, C++, and Rust let you use whatever the OS has, and the OS has threads

A higher level language can be more opinionated, but a low level one shouldn't straight jacket you.

i.e. Rust can be used to IMPLEMENT an Erlang runtime

If you couldn't use threads, then you could not implement an Erlang runtime.