ihaskell VS hlint

Are you referring to IHaskell: https://github.com/IHaskell/IHaskell?

Note that we do have the IHaskell kernel for Jupyter, so we don't have to be that jealous.

More info: https://github.com/gibiansky/IHaskell/issues/1251

I'm stymied trying to import a package. It's Graphics.Matplotlib. (See here.) I'm wanting it for my IHaskell, but when I add it to the IHaskell stack.yaml

That looks like a generic front-end error for when the back-end is unavailable, the back-end error should be more informative, but I don't know where exactly you can find it. At this point it might make sense to open an issue on the issue tracker of IHaskell, they will be able to give you more useful answers.

​ curl -sSL https://get.haskellstack.org/ | sh git clone https://github.com/gibiansky/IHaskell cd IHaskell pip3 install -r requirements.txt stack install --fast ihaskell install --stack ​ jupyter labextension install jupyterlab-ihaskell # did not work ​ stack exec jupyter -- notebook

I haven't actually used IHaskell, however, the png file is presumably created in whatever the working directory is when the script is running. The IHaskell wiki says:

There is an open issue on hlint for it and the situation doesn't seem encouraging for anyone using apply-refact on save for Haskell files.

may want to look at something like https://github.com/ndmitchell/hlint for inspiration. it can be a little finicky but you can express mildly complicated linting rules