Could not find module ‘Control.Concurrent.Async’ when building

[tchoutri]

I have tried to build ghc-tags-1.9 from both Hackage and GitHub with GHC 9.6.6, and each time I get the same issue:

src/Main.hs:4:1: error:
    Could not find module ‘Control.Concurrent.Async’
    Perhaps you meant
      Control.Concurrent.Chan (from base-4.18.2.1)
      Control.Concurrent.STM (from stm-2.5.1.0)
      Control.Concurrent.MVar (from base-4.18.2.1)
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
  |
4 | import Control.Concurrent.Async
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: [Cabal-7125]
Failed to build exe:ghc-tags from ghc-tags-1.9. See the build log above for details.

[arybczak]

Indeed it also doesn't work for me now, but it was working a few weeks ago, WTF. async is in build-depends, what the fuck.

[arybczak]

Ok, I made appropriate revisions, it should work now.