[MacRuby-devel] NSInvocationOperation usage Segmentation fault

The following code crashes with a segmentation fault. Any idea whether I misunderstood the usage or it is a macruby bug? thanks, ALex. ---code------------------------------------------- framework 'Foundation' class Foo def bar puts 'bar' end end operation = NSInvocationOperation.alloc.initWithTarget Foo.new, selector: 'bar', object: nil queue = NSOperationQueue.alloc.init queue.addOperation(operation) # run the main loop for 2 seconds NSRunLoop.currentRunLoop.runUntilDate(NSDate.dateWithTimeIntervalSinceNow(2.0))