Couldn't match type ‘model’ with ‘Maybe model0’ on GHC 8.4.3 and gtk-0.14.10

[johannes-riecken]

If I run cabal install keera-hails-reactive-gtk-0.3 with ghc 8.4.3, installation of that package fails with

src/Graphics/UI/Gtk/Reactive/Gtk2.hs:8067:30: error:
• Couldn't match type ‘model’ with ‘Maybe model0’
‘model’ is a rigid type variable bound by
the type signature for:
treeViewSetModelReactive :: forall self model.
(TreeViewClass self, TreeModelClass model) =>
self -> ReactiveFieldWrite IO model
at src/Graphics/UI/Gtk/Reactive/Gtk2.hs:8066:1-113
Expected type: ReactiveFieldWrite IO model
Actual type: ReactiveFieldWrite IO (Maybe model0)
• In the expression: wrapMW (treeViewSetModel w)
In an equation for ‘treeViewSetModelReactive’:
treeViewSetModelReactive w = wrapMW (treeViewSetModel w)
• Relevant bindings include
treeViewSetModelReactive :: self -> ReactiveFieldWrite IO model
(bound at src/Graphics/UI/Gtk/Reactive/Gtk2.hs:8067:1)
|
8067 | treeViewSetModelReactive w = wrapMW (treeViewSetModel w)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^

[nbrk]

Graphics_UI_Gtk_Reactive_Gtk2_hs.diff.txt