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: tracker.rb
    path of file: ./repos/brakeman/lib/brakeman
    
    the code of the file until where you have to start completion: require 'set'
require 'brakeman/call_index'
require 'brakeman/checks'
require 'brakeman/report'
require 'brakeman/processors
    
  def filtered_warnings
    if self.ignored_filter
      self.warnings.reject do |w|
        self.ignored_filter.ignored? w
      end
    else
      self.warnings
    end