rails/rails — pull request #5138 by avakhov (2012-02-23 07:41:12+00:00)
Title: Remove unused global variable in controller filters test

It likes $vbf global variables used only for debug purporses (injected at 196f780e30fcece25e4d09c12f9b9f7374ebed29 3 years ago). I didn't find this in sources or in any ruby implementation.