[zozbot234]

> Rust hasn't gotten any major new language feature in the last 6 years. Most language improvement is improving orthogonality of existing features.

Rust also ships with a functioning epoch/edition system that makes it feasible to rework existing language features for improved generality, elegance etc. without losing backward compatibility. I'm not sure if Scala has anything like that.

Also, the nightly/stable split in Rust means that most new features don't reach the final adoption stage unless there's a very real consensus about their design. A lot of effort is made to get rid of incidental complexity wherever feasible, before the new features are actually stabilized.

Most language implementations that "haven't gotten any major new language feature in the last 6 years" would be described as broadly stagnant or stale, but Rust is quite different.