extract_callstack

# File activesupport/lib/active_support/deprecation/reporting.rb, line 52
        def extract_callstack(callstack)
          rails_gem_root = File.expand_path("../../../../..", __FILE__) + "/"
          offending_line = callstack.find { |line| !line.start_with?(rails_gem_root) } || callstack.first
          if offending_line
            if md = offending_line.match(/^(.+?):(\d+)(?::in `(.*?)')?/)
              md.captures
            else
              offending_line
            end
          end
        end