That's a real problem, but it's manageable for day-to-day development because reloading code in the REPL is really fast. I'm using Haskell at work at the momen

That's a real problem, but it's manageable for day-to-day development because reloading code in the REPL is really fast. I'm using Haskell at work at the moment and while rebuilding everything and rerunning all the tests takes a frustratingly long time, reloading just the module I'm working on and playing with my changes is so fast I don't notice any delay. In practice, this means that 95% of any given task feels great but the final 5% before I'm done can be a real pain because I need to rebuild everything to faithfully reproduce our production environment and that does have a slow iteration time.