False Positive, suggesting unused TemplateHaskell language pragma

[rickowens]

I have a module with the following content:

{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TemplateHaskell #-}

module MyModule (
  staticAssets,
) where


import Language.Haskell.TH (Code(Code))
import Network.Wai (Middleware)
import OM.HTTP (staticSite)


staticAssets :: Middleware
staticAssets = $$(Code (staticSite "static"))

where OM.HTTP is from the om-http package (I don't believe this is relevant, but I can simplify the example further if you believe it is relevant), and the cabal file for this project specifies Haskell2010.

hlint 3.6.1 believes that the TemplateHaskell pragma is unused and suggests that I should remove it, which is clearly wrong.

src/MyModule.hs:2:1-32: Warning: Unused LANGUAGE pragma
Found:
  {-# LANGUAGE TemplateHaskell #-}
Perhaps you should remove it.

1 hint

I suspect it may not recognize the typed splice as being TemplateHaskell?

[shayne-fletcher]

is it an instance that #1535 would fix?

[rickowens]

Yes! #1553 does fix this. Apologies, I searched for open issue of this type, but I neglected to search for closed issues.