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use('Gtk3 -init')
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var gtk3 = %O'Gtk3'
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var window = %O'Gtk3::Window'.new
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var label = %O'Gtk3::Label'.new('Goodbye, World!')
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window.set_title('Goodbye, World!')
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window.signal_connect(destroy => { gtk3.main_quit })
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window.add(label)
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window.show_all
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gtk3.main
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