anchor.diff:  -export([start/1
            , start/2
            , stop/1
  +         , shutdown/1
            , print_state/1
            , get_state/1
            , get_state/2
  
positive.code: %% implementation
  
  safer(LD,_,[stop|_]) ->
    {stop,shutdown,LD};
  safer(LD,F,[get_state|As]) ->
    CLD = last(As),
  
negative.code: safe_reply(handle_info,LD,CLD)         -> {noreply,LD#ld{cld=CLD}};
  safe_reply(_          ,LD,CLD)         -> {ok,LD#ld{cld=CLD}}.
  
  safe_default(init,LD)        -> exit(LD);
  safe_default(handle_call,LD) -> {reply,ok,LD};
  safe_default(handle_cast,LD) -> {noreply,LD};
  safe_default(handle_info,LD) -> {noreply,LD};
  