-----> Preparing app for Rails asset pipeline
Running: rake assets:precompile
Warning. Error encountered while saving cache 5360bb6db5a4334d2c54285cdc87b2b44603c220/static.css.scssc: can't dump anonymous class #<Class:0x007fc369964f18>
Warning. Error encountered while saving cache 5360bb6db5a4334d2c54285cdc87b2b44603c220/application.css.scssc: can't dump anonymous class #<Class:0x007fc369964f18>
I, [2014-11-16T00:08:45.210386 #617] INFO -- : Writing /tmp/build_48a4918221372e4550fe010de2fbfd6f/public/assets/application-692d8d8e1b1dd3eaab947f9c79b2e440.css
Asset precompilation completed (2.96s)
Cleaning assets
Running: rake assets:clean
I, [2014-11-16T00:08:47.873902 #645] INFO -- : Removed application-7af893edd04e61e3a7f9d259890ec9f9.css
当我将rails应用程序推送到heroku时，我得到了上面的输出。导致此警告的原因是什么？ can't dump anonymous class #作为一个方面，当我查看源代码时，所有内容似乎都是正确的混淆/混淆，并且网站似乎也能正常工作。 为什么错误/警告？