# File lib/phusion_passenger/utils.rb, line 858
858:         def backtrace_string(current_location = nil)
859:                 if current_location.nil?
860:                         location = nil
861:                 else
862:                         location = "in #{current_location} "
863:                 end
864:                 return "*** Exception #{self.class} #{location}" <<
865:                         "(#{self}) (process #{$$}, thread #{Thread.current}):\n" <<
866:                         "\tfrom " << backtrace.join("\n\tfrom ")
867:         end