gistfile1.txt

class Foo
  def to_ary
    ["A", "B", "C", "D"]
  end
end

def func(&block)
  yield(Foo.new)
end

func do |a, b, *c|
  puts a.inspect  # MRI => "A"          RBX => <#Foo>
  puts b.inspect  # MRI => "B"          RBX => nil
  puts c.inspect  # MRI => ["C", "D"]   RBX => []
end