Load a Haskell project into IntelliJ IDEA

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Valid as of April 21, 2020

Install IntelliJ-Haskell.

Assuming you have it — it is not enough to simply open the folder with the project. You have to do this:

• Press Ctl+Shift+A or Cmd+Shift+A (doesn't matter if you already have a project open or you're on the welcome screen). If you're on macOS — you might need to disable this shortcut in Keyboard → Shortcuts → Services, otherwise it will conflict.
• Type Import Project from Existing Sources, choose the folder.
• “Haskell Stack”, press Next.
• Project SDK: “Haskell Tool Stack”, press Finish.

Now IDE support will actually work. Note that it seems to be impossible to do this with an existing project — you have to set it up from scratch.

For more info, see Getting Started in the IntelliJ-Haskell documentation.