anchor.diff:  validate(debug) -> debug;
   validate(trace) -> trace;
   validate(_)     -> silence.
  -
  
positive.code: 
  
  timestamp() ->
      format_timestamp(now()).
  
  format_timestamp({_N1, _N2, N3} = Now) ->
      {Date, Time}   = calendar:now_to_datetime(Now),
  
negative.code: %% 
  %% %CopyrightBegin%
  %% 
  %% Copyright Ericsson AB 2000-2015. All Rights Reserved.
  %% 
  %% The contents of this file are subject to the Erlang Public License,
  %% Version 1.1, (the "License"); you may not use this file except in
  