# File lib/phusion_passenger/utils.rb, line 866
866:         def backtrace_string(current_location = nil)
867:                 if current_location.nil?
868:                         location = nil
869:                 else
870:                         location = "in #{current_location} "
871:                 end
872:                 return "*** Exception #{self.class} #{location}" <<
873:                         "(#{self}) (process #{$$}, thread #{Thread.current}):\n" <<
874:                         "\tfrom " << backtrace.join("\n\tfrom ")
875:         end