rspec/rspec-core — pull request #856 by JonRowe (2013-04-02 12:59:13+00:00)
Title: Log, count and warn deprecations via configurable io stream Make warn_deprecation use a configuable deprecatio_io which defaults to $stderr. This counts the number of deprecations and warns about them

This is a proposed implementation for #616 and alternate to #853

I should mention I based this off the last stable release, as the current master breaks for me?