Weird bug that happens with code snippets in comments when a GHC Pragma

[anshwad10]

Screen.Recording.2026-06-10.at.4.28.16.PM.mov

Your environment

Which OS do you use?

macOS

Which version of GHC do you use and how did you install it?
9.14.1 from ghcup
How is your project built (alternative: link to the project)?
Which LSP client (editor/plugin) do you use?
vscode-haskell
Which version of HLS do you use and how did you install it?
2.13.0.0 from ghcup
Have you configured HLS in any way (especially: a hie.yaml file)?
I dont think so?

Steps to reproduce

Create a new haskell file, put {-# OPTIONS_GHC -O1 #-} at the top, and put any code snippet in a comment, and try to run it

Expected behaviour

It should show the result of the code in a comment

Actual behaviour

It shows a weird bug

Debug information

idk

[anshwad10]

Also, i tried restrating HLS and the vscode haskell extension, it didnt fix it

[fendor]

Thank you for the bug report!

@dschrempf As you have touched this code, perhaps you have ideas what might be causing this?