load_tasks

# File railties/lib/rails/railtie.rb, line 182
    def load_tasks(app=self)
      extend Rake::DSL if defined? Rake::DSL
      self.class.rake_tasks.each { |block| self.instance_exec(app, &block) }

      # load also tasks from all superclasses
      klass = self.class.superclass
      while klass.respond_to?(:rake_tasks)
        klass.rake_tasks.each { |t| self.instance_exec(app, &t) }
        klass = klass.superclass
      end
    end