cabal has a `cabal freeze` command which produces frozen constraints similar to Gemfile.lock in ruby. However, current Haskell projects tend to use stack for th

cabal has a `cabal freeze` command which produces frozen constraints similar to Gemfile.lock in ruby. However, current Haskell projects tend to use stack for this purpose, see: https://www.fpcomplete.com/blog/2015/06/why-is-stack-not-cabal https://www.fpcomplete.com/blog/2015/06/why-is-stack-not-cab... (you could think of stack as analogous to ruby's Gemfile.lock plus rbenv, or python's virtualenv - it makes the whole build reproducible)