I've given up.  Really.  My last round of trying to figure out whether someone else's language was worth something, was a tour of Julia, Clojure, Rust, and Scala.

Julia is LLVM based and claims a lot of stuff, but when you dig down you realize they don't have incremental garbage collection yet.  They just have "stop the world" garbage collection which is totally inappropriate for soft realtime systems, i.e. games.  Their target market is to replace Fortran and Matlab.  They can get away with offline batch processes where only "throughput overall" matters, latency at the moment doesn't.  So they can make all kinds of performance claims, but my real world problems don't currently match their real world problems, and nothing says they ever have to get there.  I'll keep my eye on it, but I'm not expecting them to deliver in a timeframe that matters to me.  It's a young language.

Rust is LLVM based as well.  I can't remember my specific objections to it, although I know I've written them down somewhere.  My impression is that it's pretty "early days" for the language.

Clojure is a lisp on top of the JVM.  I'm a performance oriented guy.  Apparently in their culture, if they want something to go fast, they throw it over the fence to Java.  Which isn't saying that much.  I just don't expect them to ever embrace my game developer concerns.

Scala is a FP language on top of the JVM, with more concern for performance.  It's also more mature, it's been around longer.  I don't think I either rejected or accepted it.  My issues were compounded by me ditching Linux after a 3 year experiment and going back to Windows.  "What's going to play well with MSVC and DirectX?" became noteworthy issues, and I don't remember the Scala ecology providing good answers.

YMMV per what you actually need your language for.

The game industry pretty much stagnated in C++.  C++ has added some features over time, which also adds complexity to an already too complex language.  I'm simply not a fan.  Could also be that growth in the gaming industry has been in the mobile space, a segment I hate for its wimpy devices, small screens, and short attention span players.  I'm a desktop gamer.  Anyways I think the lack of any serious need of resources in the mobile space, has probably meant people can implement those kinds of games in "whatever" and don't really have to think about performance.

Cheers,

Brandon