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: sequel.rb
    path of file: ./repos/polyphony/lib/polyphony/adapters
    
    the code of the file until where you have to start completion: # frozen_string_literal: tru
    
    def hold(_server = nil)
      @pool.acquire do |conn|
        yield conn
      rescue Polyphony::BaseException
        # The connection may be in an unrecoverable state if interrupted,
        # discard the connection from the pool so it isn't reused.
        @pool.discard!
        raise
      end
    end