Options Not Working In v1.9.41?

I recently upgraded to ghc 8.0.2 and stack lts-8.0 from ghc 8.0.1 and stack lts-7.10. Accordingly, I ran stack install hlint to use an hlint built with the new version of ghc.

With the old setup this would work just fine:

eric@linux-epth:total-beginner-haskell$ hlint src/Borrower.hs --hint=Generalise
src/Borrower.hs:44:3: Suggestion: Use mappend
Found:
  getName br ++
    " (" `mappend` show (getMaxBooks br) `mappend` " books)"
Why not:
  getName br `Data.Monoid.mappend`
    (" (" `mappend` show (getMaxBooks br) `mappend` " books)")

1 hint

After the upgrade to v1.9.41 (from v1.9.35 I think) this no longer seems to be working:

eric@linux-epth:total-beginner-haskell$ hlint src/Borrower.hs --hint=Generalise
No hints

How can I correct this?

Thank you.

EDIT: Sorry, got this fixed: hlint src/Borrower.hs --hint=Generalise.hs works correctly...

Reproduce the reported commands against HLint v1.9.41, using src/Borrower.hs as the example input, and compare --hint=Generalise with --hint=Generalise.hs. The issue is effectively resolved by the workaround, so any remaining work would be to identify and document why the extension is required.