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use glib::subclass::prelude::*; use super::container::ContainerImpl; use ContainerClass; use HeaderBarClass; pub trait HeaderBarImpl: ContainerImpl + 'static {} unsafe impl<T: ObjectSubclass + HeaderBarImpl> IsSubclassable<T> for HeaderBarClass { fn override_vfuncs(&mut self) { <ContainerClass as IsSubclassable<T>>::override_vfuncs(self); } }