# File lib/phusion_passenger/utils.rb, line 430
430:         def backtrace_string(current_location = nil)
431:                 if current_location.nil?
432:                         location = nil
433:                 else
434:                         location = "in #{current_location} "
435:                 end
436:                 return "*** Exception #{self.class} #{location}" <<
437:                         "(#{self}) (process #{$$}):\n" <<
438:                         "\tfrom " << backtrace.join("\n\tfrom ")
439:         end