I want this but for Haskell :-) Maybe some of the amazing work on dataframe[0] and related libraries could be used for a better Haskell REPL in Emacs. I never much liked the notebook way of working, I prefer having a file of functions alongside a REPL, but time-to-graph is bad, and I don't know if there's a good solution to how the REPL forgets previously defined variables on reloading a file.

[0] https://dataframe.readthedocs.io/en/latest/exploratory_data_...