# File lib/templater/core_ext/kernel.rb, line 3
    def instance_exec(*args, &block)
      mname = "__instance_exec_#{Thread.current.object_id.abs}_#{object_id.abs}"
      Object.class_eval{ define_method(mname, &block) }
      begin
        ret = send(mname, *args)
      ensure
        Object.class_eval{ undef_method(mname) } rescue nil
      end
      ret
    end