Yes languages like Erlang and runtimes like Coyote and Orleans.
I’ve not worked with Coyote, but if it is the system for .net, it describes itself as a framework, “Coyote provides developers a programming framework for confidently building reliable asynchronous software on the .NET platform”.
Orleans similarly describes itself as a framework, “Orleans is a cross-platform software framework for building scalable and robust distributed interactive applications based on the .NET Framework.”
Rust is a language, similar frameworks are being built with it, the point your making does not appear to be about the language.
You say, that the Erlang concurrency model has higher overhead than Rust. In Rust there are probably multiple projects going on right now (one of them is Bastion, but I guess there are probably others), which try to provide Erlang like concurrency. What do you mean by overhead of a concurrency model (that of Erlang) being higher than the overhead a programming language (Rust)? As far as I know Erlang's lightweight processes are about as lightweight as you can get. Is there a Rust framework for Erlang like concurrency, which reduces the footprint of lightweight processes even more?
The “process” model of Erlang is about as lightweight as you can get, agreed.
In terms of capabilities of beam across systems, point taken. Though we start stretching some of the understanding of where languages end and runtimes begin... Rust and C make those boundaries a little more clear.
