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diff --git a/src/Gtk/Tune.icl b/src/Gtk/Tune.icl
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+implementation module Gtk.Tune
+
+import Control.Applicative
+import Control.Monad
+import Control.Monad.Identity
+import Control.Monad.State
+
+import Gtk
+
+instance tune w GtkMargins | gtkWidget w
+where
+	tune widgetf margins =
+		widgetf >>= \widget ->
+		setMargins margins widget >>|
+		pure widget