gistfile1.rb

class A
  def foo(a, b, c)
    p [a, b, c]
  end
end

class B < A
  def foo(a, (b, c), d)
    a = 5 # modify a - the super call sees it
    b = 6 # modify b - the super call doesn't see it
    super
  end
end

B.new.foo(1, [2, 3], 4)

# [5, [2, 3], 4]