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From README:
d1 = EM::DefaultDeferrable.new
d2 = EM::DefaultDeferrable.new
d = EM::DependentDeferrable.on(d1, d2)
d.callback {|a, b| puts "a: #{a} b: #{b}"}
d1.succeed 'one', 'one more'
d2.succeed :two
Prints:
a: ["one", "one more"] b: [:two]