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The ObjectDeref trait now provides all the magic that is required to fake inheritance. Replace the "impl SysBusDevice" block of qemu_api::sysbus with a trait, so that sysbus_init_irq() can be invoked as "self.init_irq()" without any intermediate upcast. Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>