You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rb
    path of file: ./repos/completely-unscientific-benchmarks/ruby
    
    the code of the file until where you have to start completion: #!/bin/env ruby

class Node
  attr_accessor :x, :y, :left, :right

  def initialize(x)
    @x = x
    @y = rand()
    @left = nil
    @right = nil
  end
end

def merge(lower
    
def merge(lower, greater)
  if lower.nil?
    return greater
  elsif greater.nil?
    return lower
  elsif lower.y < greater.y
    lower.right = merge(lower.right, greater)
    return lower
  else
    greater.left = merge(lower, greater.left)
    return greater
  end