Automatically configure Flycheck for Haskell. ;; Cabal support Try to find a Cabal file for the current Haskell buffer, and configure syntax checking according to the Cabal project settings. ;; Cabal sandboxes Try to find a Cabal sandbox configuration for this project, and configure the Haskell syntax checkers in Flycheck to use the package database from the Sandbox. ;; Stack support Try to find a stack.yaml file for current project and configure stack projct according to the Stack project settings. ;; Setup (add-hook 'flycheck-mode-hook #'flycheck-haskell-setup)