But isn't such a language already there? It's called the D Programming Language [1]. Sorry a bit tongue-in-cheek, but I'm getting tired of all these 'even-more-awesome' new programming language variants of C++.
There's a lot of "@nogc" D code out there. Audio FX plugins that do realtime DSP and game/graphics stuff come to mind.
I'd rather have the language give me a choice because it's very convenient to have. You'd be surprised how performant even GC'ed code in D's can be.
Not if you wish to use the standard library though right ?
All functions in the stdlib that are nogc are marked "nogc" in their definition
If you make extensions for R/Tcl/Lisps for computations, plotting, abstract mathematics,
why the Garbage collection is bad?
You have native performance!
The only complaint is that D might think of adding some of the ergonomics of ML-family of languages. But it has its opinion (like Lisps) and I respect that.
Ergonomics and possibly safety could be goals.
Now C++, Java and C# have many capabilities where D had an upper had back when Andrei's book came out, and naturally new competition also came into play with better corporate support.