Scheme is often used in prototype interpreters. I just wrote a very simple language grammar in Haskell, so I guess really "anything" can be an answer. If you'r

Scheme is often used in prototype interpreters. I just wrote a very simple language grammar in Haskell, so I guess really "anything" can be an answer. If you're asking about compilers , then it tends to be C (although LLVM is coming along nicely).