Wrong location for "no module export list" warning

[TeofilC]

Your environment

Which OS do you use? NixOS

Which version of GHC do you use and how did you install it? GHC-9.10 using haskell.nix

How is your project built (alternative: link to the project)? cabal-install

Which LSP client (editor/plugin) do you use? emacs+lsp-mode

Which version of HLS do you use and how did you install it? 2.11.0.0, built from source from 4c7e56a

Have you configured HLS in any way (especially: a hie.yaml file)? no

Steps to reproduce

{-# LANGUAGE DeriveAnyClass #-}
module Repro where
foo = 123

Expected behaviour

The warning should be associated to the module header

Actual behaviour

The warning is associated to the LANGUAGE pragma

Debug information

[fendor]

Thank you for the bug report!

Is GHC reporting the correct location? If so, then it should be an easy fix. If GHC provides a wrong location, it is probably harder to fix.

[TeofilC]

It seems to be an issue with GHC (I don't know why I didn't check sooner haha). I've created an upstream ticket here: https://gitlab.haskell.org/ghc/ghc/-/issues/26163

[TeofilC]

I also assumed this was a recent regression, since we just upgraded to 9.10, but in fact this behaviour seems to happen with all the older versions of GHC I've tried too