remove hint about adding [] around expressions

There is a decent amount of feedback that it is confusing
elm/error-message-catalog#296 and I suspect
it's not that helpful in practice.

Author: evancz

compiler/src/Reporting/Error/Type.hs

@@ -431,10 +431,6 @@ problemToHint problem =
           ]
       ]
 
-    T.AnythingToList ->
-      [ D.toSimpleHint "Did you forget to add [] around it?"
-      ]
-
     T.ArityMismatch x y ->
       [ D.toSimpleHint $
           if x < y then

compiler/src/Type/Error.hs

@@ -175,7 +175,6 @@ data Problem
   | StringToFloat
   | AnythingToBool
   | AnythingFromMaybe
-  | AnythingToList
   | ArityMismatch Int Int
   | BadFlexSuper Direction Super Name.Name Type
   | BadRigidVar Name.Name Type
@@ -301,7 +300,7 @@ toDiff localizer ctx tipe1 tipe2 =
       different
         (toDoc localizer ctx t1)
         (RT.apply ctx (D.dullyellow (L.toDoc localizer home name)) [toDoc localizer RT.App t2])
-        (Bag.one AnythingToList)
+        Bag.empty
 
     (Alias home1 name1 args1 t1, t2) ->
       case diffAliasedRecord localizer t1 t2 of