module ActiveSupport::Deprecation::Reporting

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