Fragment caching is broken on edge rails

As far as I can tell, it's not possible to do : <% cache("stuff") do %>    <%= something_expensive() %> <% end %> in a view on edge rails, without it raising an exception. That sounds unlikely, I know - I find it hard to believe that such an obvious bug would have lasted so long. ('long' being a relative term, of course - 6 days is an eternity in edge rails timescales!)

The ticket is here - http://dev.rubyonrails.org/ticket/10733. Is anyone on edge rails using fragment caching without problems?

And assuming this is a bug, can anything be done to improve cache testing so it catches stuff like this?

The ticket is here -http://dev.rubyonrails.org/ticket/10733. Is anyone on edge rails using fragment caching without problems?

I've applied mindforge's fix.

And assuming this is a bug, can anything be done to improve cache testing so it catches stuff like this?

Certainly. Please do investigate a patch that adds more test cases. Thanks!

Well, FWIW I've added some basic functional tests for caching, that use a controller to do caching in the 'real world' way, rather than @store.write. Adds a bit of extra test coverage, and gives a failing test case for my cache problem. It's still up at the original ticket - http://dev.rubyonrails.org/ticket/10733