Ruby enabling tail recursion

tailcall.rb

RubyVM::InstructionSequence.compile_option = {
    tailcall_optimization: true,
    trace_instruction: false
}

eval <<END 
  def factorial_tailcall(n, accumulated=1)
    return accumulated if n <= 1
    factorial_tailcall(n - 1, n * accumulated)
  end
  
  def factorial_recursive(n)
    return 1 if n <= 1
    n * factorial_recursive(n - 1)
  end
  
  def factorial_iterative(n)
    accumulated = 1
    while n > 1
      accumulated = n * accumulated
      n = n - 1
    end
    accumulated
  end
END