haskell-mode errors mix with lcp-haskell errors? about lsp-haskell

[Martinsos]

(req-package lsp-mode
  :ensure t
  :config
  (progn
    (setq lsp-document-sync-method 'full) ;; To make sure documents don't get out of sync regarding parse errors.
    ))

(req-package lsp-haskell
  :ensure t
  :require lsp haskell-mode
  :config
  (progn
    (add-hook 'haskell-mode-hook #'lsp)
    ))

(req-package lsp-ui
  :ensure t
  :require lsp-mode
  :config
  (progn
    (add-hook 'lsp-mode-hook 'lsp-ui-mode)
    (add-hook 'haskell-mode-hook 'flycheck-mode)
    ))

[michaelpj]

Not sure if you're seeing this still, but I found I needed to turn off the default checker that flycheck provides for Haskell. Like so (in custom-set-variables):

'(flycheck-disabled-checkers '(haskell-stack-ghc haskell-ghc))

Does this help you?

[Martinsos]

Thanks @michaelpj , yes I am sure that would help! I switched in the meantime from my long-time vanilla emacs to spacemacs so I don't have this problem any more, although I am not using lsp but dante at the moment -> I do plan to try out lsp again when I catch some time, but I believe in spacemacs checkers will already be correctly configured. At the time of creating this issue I didn't know about flycheck checkers mechanism.
Thanks, I am closing the issue!