Rails 3.1.0.rc1 assets not compiling

[Noel2 (Noel)]

I started a test app to try out 3.1

At first .coffee files were compiling into application.js, but now nothing is compiled.

I set up 2 .coffee files with alerts and expected //=require_tree to incorporate them into application.js, but that does not happen. ran rake assets:precompile and indeed the file in public/assets matches what I see in the browser.

Here is a list of my gems

https://gist.github.com/noel/990283

and here is my sample app

GitHub - noel/happy

I also tried requiring specific files like //= require foo and that had no effect.

interestingly if I also required a file that does not exist like //= require bar

I see no console errors during compilation

Any ideas what could be the cause?

[Noel2 (Noel)]

found the problem.

There can't be any blank lines in the manifest

https://github.com/noel/happy/blob/master/app/assets/javascripts/application.js#L8-10

Is this a bug or should the text in the generated file be more explicit?