[MetaDark]

It sounds like your definition of stable applies to a very limited set of programming languages. The only thing I can think of that would fit that definition is C.

Have you seen how many new features have been added to C++20? (which is probably the closest language to Rust) Not to mention any of the dynamically typed languages.

[1_player]

Elixir is stable in that sense as well. Which IMO is very nice as I don't feel I have to relearn the language if I leave for 2 years, and I have to rewrite a 2 years old project to make use of any new idiom and syntax sugar.