Well, OCaml is indeed rather popular for implementing compilers for new languages (sometimes later bootstrapped), including ones which became rather popular. I can think of F#, Rust, Elm, Haxe, FlowType for instance.
There's also a project for implementing a prolog like interpreter for doing type checking and other logic for Rust, I think it works on the MIR level, but could be wrong on that.
pera|7 years ago
Another two relatively popular languages implemented in Haskell are Idris and Agda.
specializeded|7 years ago
https://github.com/facebook/reason
Shoop|7 years ago
afrisch|7 years ago
ecnahc515|7 years ago