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: profiler.rb
    path of file: ./repos/app_profiler/lib/app_profiler
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "stackprof"

module AppProfiler
  m
    
      def run(params = {})
        started = start(params)

        yield

        return unless started

        stop
        results
      ensure
        # Only stop the profiler if profiling was started in this context.
        stop if started
      end