    # File bin/el4r-instance, line 464
        def initialize
          @emacs_in = STDIN
          @emacs_out = STDOUT
          @call_level = 0
          @last_error = nil
          @el4r_is_debug = ENV["EL4R_DEBUG"]
          @el4r_homedir = ENV["EL4R_HOME"] || File.expand_path("~/.el4r")
          @elvar = ELVariables.new(self)
          @el4r_rubyobj_stock = ELRubyObjectStock.new(self)
          @el4r_garbage_elobj_ids = []

          log = ENV["EL4R_LOG"]
          @log = case log
                 when "stderr"; STDERR
                 when /^\|/; File.popen($~.post_match, "w")
                 else; File.open(log || "/tmp/el4r-#{`whoami`.chomp}.#{Process.pid}.log", "w")
                 end

          @el_backtrace_reset_threshold = 1 # very nasty hack!
          @el_backtrace = []
        end