run_tasks_blocks

# File railties/lib/rails/railtie.rb, line 199
    def run_tasks_blocks(app) #:nodoc:
      extend Rake::DSL
      self.class.rake_tasks.each { |block| 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| instance_exec(app, &t) }
        klass = klass.superclass
      end
    end