Ошибка:Ожидался идентификатор - Pascal ABC

Program bank;
const
  n  = 10;
  n5 =  6;
  n6 =  3;
  nT = 50;
 
function f1: integer;
begin
  f1 := random(4) + 2;
end;
function f2: integer;
begin
  f2 := random(10);
end;
 
(***** TClient *****)
type
  PTClient = ^TClient;
  TClient = class
 
    constructor create(value: integer);
    function get_id: integer;
 
  private
    ID: integer;
  end;
 
constructor TClient.create(value: integer);
begin
  ID := value;
end;
function TClient.get_id: integer;
begin
  get_id := ID;
end;
 
 
type
  T = PTClient;
 
  PTQueueItem = ^TQueueItem;
  TQueueItem = class
    item: T;
    next: PTQueueItem;
 
    constructor create(value: T);
  end;
 
  TQueue = class
    constructor create;
    destructor destroy;
 
    procedure get(var value: T);
    procedure put(const value: T);
 
    function is_empty: boolean;
 
  private
    front, back: PTQueueItem;
  end;
 
 
 
constructor TQueueItem.create(value: T);
begin
  item := value;
  next := nil;
end;
 
constructor TQueue.create;
begin
  front := nil; back := nil;
end;
 
destructor TQueue.destroy;
var value: T;
begin
  while not is_empty do get(value);
end;
 
procedure TQueue.get(var value: T);
var pt: PTQueueItem;
begin
  if is_empty then begin
    writeln('Trying to Get from the empty queue !'); halt(101)
  end;
 
  pt := front;
  front := front^.next;
 
  value := pt^.item;
  dispose(pt);
end;
 
 
procedure TQueue.put(const value: T);
var pt: PTQueueItem;
begin
  pt := new(PTQueueItem, create(value));
  if is_empty then begin
    front := pt; back := pt;
  end
  else begin
    back^.next := pt;
    back := pt;
  end;
end;
 
 
function TQueue.is_empty: boolean;
begin
  is_empty := (front = nil)
end;
 
 
type
  status = (
    _busy = 0, _waiting, _vacation
  );
 
  PTCasher = ^TCasher;
  TCasher = object
 
    state: status;
    work_time, ID: integer; { *** const *** }
    working_time, this_client: integer;
 
  public
    constructor create(_id, _work: integer);
    function handle(var changed: integer): status;
    procedure next;
  end;
 
 
constructor TCasher.create(_id, _work: integer);
begin
  ID := _id; work_time := _work; state := _waiting;
 
  working_time := work_time;
end;
 
function TCasher.handle(var changed: integer): status;
begin
  changed := 0;
 
  if state = _busy then begin
    dec(this_client);
    dec(working_time);
 
    if this_client = 0 then begin
      state := _waiting; changed := 1;
    end;
  end;
 
  if state = _vacation then begin
    inc(working_time);
    if working_time > 0 then begin
      state := _waiting; working_time := work_time; changed := 1;
    end;
  end;
 
  if state = _waiting then begin
    if changed = 0 then dec(working_time);
    if working_time <= 0 then begin
      state := _vacation; working_time := -n6; changed := 1;
    end;
  end;
 
  handle := state;
end;
 
procedure TCasher.next;
begin
  state := _busy;
  this_client := f2;
end;
 
 
type
  TManager = object
    queue: TQueue;
    cash_workers: array[0 .. pred(n)] of PTCasher;
 
    current_time, after_prev_enter: integer;
 
  public
    constructor create;
    destructor destroy;
 
    procedure run;
  end;
 
constructor TManager.create;
var i: integer;
begin
  current_time := 0; after_prev_enter := 0;
  for i := 0 to pred(n) do
    cash_workers[i] := new(PTCasher, create(i + 1, n5));
end;
 
destructor TManager.destroy;
var i: integer;
begin
  for i := 0 to pred(n) do
    dispose(cash_workers[i]);
end;
 
procedure TManager.run;
const
  client_entered: integer = 0;
var
  i: integer;
  status_changed: integer;
  curr_status: status;
  client: PTClient;
begin
 
  while (current_time <= nT) or (not queue.is_empty) do begin
 
    for i := 0 to pred(n) do begin
      status_changed := 0;
      curr_status := cash_workers[i]^.Handle(status_changed);
 
      if status_changed <> 0 then { statistics }
        case curr_status of
          _vacation:
            writeln('casher #', i, ' goes to rest at:: ', current_time);
          _waiting:
            writeln('casher #', i, ' awaiting at:: ', current_time);
        end;
 
      if curr_status = _waiting then
        if not queue.is_empty then begin
 
          queue.get(client);
          writeln('client #', client^.get_id, ' sent to casher #', i, ' at:: ', current_time);
          cash_workers[i]^.next;
          dispose(client);
 
        end;
 
    end;
 
    if current_time <= nT then begin
 
      inc(after_prev_enter);
      if after_prev_enter > f1 then begin
 
        after_prev_enter := 0;
        inc(client_entered);
        client := new(PTClient, create(client_entered));
        queue.put(client);
 
      end;
 
    end;
    inc(current_time);
  end;
  writeln(client_entered);
 
end;
 
var bank: TManager;
begin
 
  bank.create;
  bank.run;
  bank.destroy;
end.