Here is some background on the Haskell situation: https://www.joachim-breitner.de/blog/802-More_thoughts_on_a_...

Ada has had even less progress and I am not aware of any writeups.

TL;DR: Ada and Haskell need to have compilers implemented a language that has a full source bootstrap path such as C, Go, or Rust that implement just enough features to compile the official compilers.

Just curious, are C, Go and Rust and the only viabile languages for an implementation?