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def wrap(m)

  Module.new{

    include m

    def foo

      super * 3

    end

  }

end

module A

  def foo

    "Hello!"

  end

end

# stack level too deep (SystemStackError)  in 1.9

$mod = [A,A]

$mod.map{|mod| wrap(mod) }.each{|m|

  p Class.new{ include m }.new.foo

}

# NO error in 1.9 when removing the map

$mod.each{|mod| 

  m = wrap(mod)

  p Class.new{ include m }.new.foo

}

# Also an error on 'manual map'

$mod = [wrap(A),wrap(A)]

$mod.each{|m|

  p Class.new{ include m }.new.foo

}

# But no error on mapping single-element arrays

$mod = [A]

$mod.map{|mod| wrap(mod) }.each{|m|

  p Class.new{ include m }.new.foo

}