Always default to cabal-repl if there is a .cabal-sandbox dir

See #864

Author: purcell

haskell-customize.el

@@ -398,14 +398,16 @@ same vein as `haskell-indent-spaces'."
   "Return `haskell-process-type', or a guess if that variable is 'auto."
   (if (eq 'auto haskell-process-type)
       (cond
+       ;; User has explicitly initialized this project with cabal
+       ((locate-dominating-file default-directory ".cabal-sandbox")
+        'cabal-repl)
        ((and (locate-dominating-file default-directory "stack.yaml")
              (executable-find "stack"))
         'stack-ghci)
        ((locate-dominating-file
          default-directory
          (lambda (d)
-           (or (file-directory-p (expand-file-name ".cabal-sandbox" d))
-               (cl-find-if (lambda (f) (string-match-p ".\\.cabal\\'" f)) (directory-files d)))))
+           (cl-find-if (lambda (f) (string-match-p ".\\.cabal\\'" f)) (directory-files d))))
         'cabal-repl)
        (t 'ghci))
     haskell-process-type))