rails/rails — pull request #5652 by headius (2012-03-29 11:06:03+00:00)
Title: Always include requires for built-in frameworks, for customization

Rails is a modular framework, which means customization is likely in many (most?) cases. To make this easier, always generate in application.rb a commented-out list of built-in framework require statements, so it's trivially easy to strip an app down.

I always forget what's included in "rails/all". This would mean I never have to poke around for it again.

This could/should be backported into a 3.x update as well.