The getPathToOptableXML trick does not work in HLS

[Ptival]

The Template Haskell trick found here does not work in haskell-language-server, which executes the file under ghcide, seemingly in a temporary directory that does not contain the extra source files.

To check this, you can edit to:

             absPathToThisFile <- D.makeAbsolute __FILE__
             error absPathToThisFile

which will error out with (on a Mac):

• Exception when trying to run compile-time code:
    /var/folders/fr/xkmxc8ld07dgz85nwdn0zx0c0000gn/T/extra-dir-31378571509/___GHCIDE_MAGIC___

This is not particularly high priority, just a minor inconvenience. It may be hard to find a trick that also works for this setup.