company-ghc backend found: company-ghc but ghc-boot process has not been done

[FirstLoveLife]

* company-ghc backend found: company-ghc
* automatic scan module is enabled
* ghc-boot process has not been done

Module                                  Alias               Candidates
-------------------------------------------------------------------------------
Prelude                                 -                        nil

As the diag above, though company-ghc is added to backend, ghc-boot process cannot been done. What should I do?

My config:

(add-to-list 'company-backends 'company-ghc)
(set-company-backend! 'haskell-mode
  'company-ghc)
  (add-hook 'haskell-mode-hook 'eglot-ensure)

[iquiw]

company-ghc assumes one already setup ghc-mod. See ghc-mod wiki Frontend.

I don't use eglot, so I am not sure, but if you are using eglot, I suppose you don't need company-ghc.

[FirstLoveLife]

Thanks for reply, I didn't setup ghc-mod indeed. I have remove company-ghc from backend, now eglot works fine with haskell language server and completion has no problem