The big difficulty in adopting it in any current codebase is that most current pieces of software are not written in haskell. The huge advantage of projects in

The big difficulty in adopting it in any current codebase is that most current pieces of software are not written in haskell. The huge advantage of projects in C like OpenSSL is that you can produce platform-native shared libraries that can be used easily from any other language. A bit of research shows that it's possible to make shared libraries with haskell, but not quite as straightforward to use them. I have no practical experience about how troublesome it would actually be.