code: func (cms *ConcurrentMergeScheduler) verbose() bool {
  	return cms.writer != nil && cms.writer.infoStream.IsEnabled("CMS")
  }
docs: /*
  Returns true if verbosing is enabled. This method is usually used in
  conjunction with message(), like that:
  
  	if cms.verbose() {
  		cms.message("your message")
  	}
  */