# File lib/sass/plugin/staleness_checker.rb, line 35
      def initialize
        @dependencies = self.class.dependencies_cache

        # Entries in the following instance-level caches are never explicitly expired.
        # Instead they are supposed to automaticaly go out of scope when a series of staleness checks
        # (this instance of StalenessChecker was created for) is finished.
        @mtimes, @dependencies_stale = {}, {}
      end