Haskell is one example; Clojure, Rust, Erlang, Scala are mainly the ones we think about in this category but even in Modern C++ code const is used quite a lot.

Haskell is one example; Clojure, Rust, Erlang, Scala are mainly the ones we think about in this category but even in Modern C++ code const is used quite a lot. Go is not yet very widely known or popular outside the HN bubble; I think it is a bit early for "daily driver" argument.