new

# File railties/lib/rails/backtrace_cleaner.rb, line 11
    def initialize
      super
      add_filter do |line|
        # We may be called before Rails.root is assigned.
        # When that happens we fallback to not truncating.
        @root ||= Rails.root && "#{Rails.root}/"
        @root && line.start_with?(@root) ? line.from(@root.size) : line
      end
      add_filter do |line|
        if RENDER_TEMPLATE_PATTERN.match?(line)
          line.sub(RENDER_TEMPLATE_PATTERN, "")
        else
          line
        end
      end
      add_silencer { |line| !APP_DIRS_PATTERN.match?(line) }
    end