Stack run does not print text in terminal

This isn’t completely related to intellij-haskell, but the run task is created from this plugin, so perhaps someone knows something about this.

I have a very simple test:

main = do
  putStrLn "Hello, what's your name?"
  name <- getLine
  putStrLn ("Hey " ++ name)

If I run it in my terminal or in the intellij terminal, using either stack run or stack build --exec ***.exe (what the plugin template uses), it works.

However, if I run the template, which launches the run tab, I don’t get the hello prompt until I type something and press enter. When I first tried this, I thought my project failed to build for many minutes.

Does anyone have any idea what’s going on here?

Using v1.0.0-beta40 on macOS

[rikvdkleij]

Thanks for reporting!

I can reproduce this issue but I can not find the cause.

[rikvdkleij]

No problem 😄

I do not know how to enable it by default because it’s in the Haskell code. Also do not see a Stack option for this.

Alternative: In the Run/Debug configuration window, display a warning that it may be necessary to add this for basic IO, like

Yes, that is the most simple alternative solution.