anchor.diff:  	  %% The following two are for 'multi_scheduling'
   	  t_atom('block'),
   	  t_atom('unblock'),
  +	  %% For 'scheduler_wall_time'
  +	  t_atom('true'),
  +	  t_atom('false'),
   	  %% The following is for 'internal_cpu_topology'
   	  t_internal_cpu_topology()])];
   arg_types(erlang, system_info, 1) ->
  
positive.code: 	  t_atom('trace_control_word'),
  	  %% 'internal_cpu_topology' is an undocumented internal feature.
  	  t_atom('internal_cpu_topology'),
  	  t_integer()]),
     t_sup([t_integer(),
  	  %% 'cpu_topology'
  
negative.code: 		     t_sequential_tracer();
  		   ['trace_control_word'] ->
  		     t_integer();
  		   ['scheduler_wall_time'] ->
  		     t_boolean();
  		   List when is_list(List) ->
  		     T_system_flag_2;
  		   unknown ->
  