# File irb/workspace.rb, line 18
    def initialize(*main)
      if main[0].kind_of?(Binding)
        @binding = main.shift
      elsif IRB.conf[:SINGLE_IRB]
        @binding = TOPLEVEL_BINDING
      else
        case IRB.conf[:CONTEXT_MODE]
        when 0  # binding in proc on TOPLEVEL_BINDING
          @binding = eval("proc{binding}.call",
                          TOPLEVEL_BINDING,
                          __FILE__,
                          __LINE__)
        when 1  # binding in loaded file
          require "tempfile"
          f = Tempfile.open("irb-binding")
          f.print <<EOF
      $binding = binding
EOF
          f.close
          load f.path
          @binding = $binding

        when 2  # binding in loaded file(thread use)
          unless defined? BINDING_QUEUE
            require "thread"

            IRB.const_set(:BINDING_QUEUE, SizedQueue.new(1))
            Thread.abort_on_exception = true
            Thread.start do
              eval "require \"irb/ws-for-case-2\"", TOPLEVEL_BINDING, __FILE__, __LINE__
            end
            Thread.pass
          end
          @binding = BINDING_QUEUE.pop

        when 3  # binding in function on TOPLEVEL_BINDING(default)
          @binding = eval("def irb_binding; private; binding; end; irb_binding",
                          TOPLEVEL_BINDING,
                          __FILE__,
                          __LINE__ - 3)
        end
      end
      if main.empty?
        @main = eval("self", @binding)
      else
        @main = main[0]
        IRB.conf[:__MAIN__] = @main
        case @main
        when Module
          @binding = eval("IRB.conf[:__MAIN__].module_eval('binding', __FILE__, __LINE__)", @binding, __FILE__, __LINE__)
        else
          begin
            @binding = eval("IRB.conf[:__MAIN__].instance_eval('binding', __FILE__, __LINE__)", @binding, __FILE__, __LINE__)
          rescue TypeError
            IRB.fail CantChangeBinding, @main.inspect
          end
        end
      end
      eval("_=nil", @binding)
    end
            

 
               # File irb/ext/tracer.rb, line 56
def evaluate(context, statements, file = nil, line = nil)
  if context.use_tracer? && file != nil && line != nil
    Tracer.on
    begin
      __evaluate__(context, statements, file, line)
    ensure
      Tracer.off
    end
  else
    __evaluate__(context, statements, file || __FILE__, line || __LINE__)
  end
end
            

 
               # File irb/workspace.rb, line 91
def filter_backtrace(bt)
  case IRB.conf[:CONTEXT_MODE]
  when 0
    return nil if bt =~ /\(irb_local_binding\)/
  when 1
    if(bt =~ %r!/tmp/irb-binding! or
        bt =~ %r!irb/.*\.rb! or
        bt =~ /irb\.rb/)
      return nil
    end
  when 2
    return nil if bt =~ /irb\/.*\.rb/
    return nil if bt =~ /irb\.rb/
  when 3
    return nil if bt =~ /irb\/.*\.rb/
    return nil if bt =~ /irb\.rb/
    bt = bt.sub(/:\s*in `irb_binding'/, '')
  end
  bt
end