[Question] How to make documentation for system modules appear?
Stexxe opened this issue · 2 comments
When I hover over the function it says:
putStrLn :: String -> IO () -- Defined in ‘System.IO’
ghc-9.0.2: Can't find any documentation for System.IO. This is probably because the module was compiled without -haddock, but it's also possible that the module contains no documentation.
Try re-compiling with -haddock.
Could you please tell me how to recompile system modules with -haddock (I use stack)? Or maybe I should use an older version of ghc?
I've fixed it by switching to ghc 8.10.4 (lts-18.6).
This is interesting. Perhaps something had changed between stack's GHC libraries between the two versions.
For the record, I just use the :doc command of GHCi and honestly I have no idea how exactly I can get docs for it all the time. It does seem to work with the 'current project' better than dependency libraries.