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: test_pointer.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/fiddle
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
begin
  require_relative 
    
    def test_to_ptr_with_ptr
      ptr = Pointer.new 0
      ptr2 = Pointer.to_ptr Struct.new(:to_ptr).new(ptr)
      assert_equal ptr, ptr2

      assert_raise(Fiddle::DLError) do
        Pointer.to_ptr Struct.new(:to_ptr).new(nil)
      end
    end