Intention "add type signature" isn't working

Everything else seems to be fine (code completion, type info, syntax checking). I would appreciate any advice.

ghc-mod version 5.6.0.0 compiled by GHC 7.10.3
The Glorious Glasgow Haskell Compilation System, version 7.10.3
IntelliJ IDEA 2016.2.5 Ultimate
Ubuntu 16.04

PS: I am a total beginner in Haskell and yet doesn’t fully understand many things, like build process. But stack build and running executable is working, so I assume I have set it up properly.

[carymrobbins]

Ok, this seems obvious in retrospect, but since ghc-mod is not reporting a warning for the missing type signature, you may need to explicitly provide the -fwarn-missing-signatures flag. You can do this via a few different methods -

1. Using a {-# OPTIONS_GHC -fwarn-missing-signatures #-} pragma at the top of your file.
2. Including ghc-options: -fwarn-missing-signatures in your project’s cabal file.
3. Adding -g -fwarn-missing-signatures to the flags list when configuring ghc-modi in the Haskell Tools settings.

Sorry for the delayed resolution. Let me know if this alleviates the issue. If this does solve the problem, I will document it in the Quick Start Guide and close this ticket.

[carymrobbins]

Thanks @mnn! I’ve updated the Quick Start Guide accordingly; see Automatically add type signatures.