Erroneous error triggered on `{- # -}` (`#` is surrounded by whitespace)

[Aster89]

Your environment

Which OS do you use? ArchLinux up-to-date

Which version of GHC do you use and how did you install it? 9.14.1 via GHCup

How is your project built (alternative: link to the project)? ghc --make hello.hs && ./hello

Which LSP client (editor/plugin) do you use? Vim + YCM

Which version of HLS do you use and how did you install it? 2.14.0.0 via GHCup

Have you configured HLS in any way (especially: a hie.yaml file)?

Steps to reproduce

Open a file with this content

main :: IO ()
main = putStrLn "Hello World"
{- # -}

Expected behaviour

HLS should show no errors.

Actual behaviour

HLS shows the error parse error on input ‘{’ [GHC-58481].

Even executing haskell-language-server-wrapper hello.hs (so taking the IDE out of the equation) shows the same error.

Debug information

[VeryMilkyJoe]

I investigated this, and the reason for the error is that we build with the ghc flag: -haddock in HLS, so when adding this flag and building the file directly with ghc, you get this exact error.

I created an issue here: https://gitlab.haskell.org/ghc/ghc/-/issues/27340