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: nil_safe_navigation.rb
    path of file: ./repos/sorbet/test/testdata/infer
    
    the code of the file until where you have to start completion: # typed: true

    
def foo(x, y)
  puts x&.to_s
  #     ^^ error: Used `&.` operator on `Integer`, which can never be nil
  puts x.to_s

  puts y&.to_s
  puts y.to_s
end