factored hindent out as a seperate feature.

modules/lang/haskell/+hindent.el

@@ -0,0 +1,6 @@
+;;; +hindent.el --- description -*- lexical-binding: t; -*-
+;;;###if (featurep! +hindent)
+
+(def-package! hindent
+  :hook (haskell-mode . hindent-mode))
+

modules/lang/haskell/config.el

@@ -3,6 +3,8 @@
 (cond ((featurep! +intero) (load! "+intero"))
       ((featurep! +dante)  (load! "+dante")))
 
+(when (featurep! +hindent) (load! "+hindent"))
+
 
 ;;
 ;; Common plugins

modules/lang/haskell/packages.el

@@ -6,7 +6,8 @@
 ;;
 (cond ((featurep! +dante)
        (package! dante))
-      (t
-       (package! intero)
-       (package! hindent)))
+      (t (package! intero)))
+
+(when (featurep! +hindent)
+      (package! hindent))