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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_1llqjj3vpdrsmngvjhg7j89jju, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static class Var<A> {
  A v; // you can access this directly if you use one thread
  
  *() {}
  *(A *v) {}
  
  synchronized void set(A a) {
    if (v != a) {
      v = a;
      notifyAll();
    }
  }
  
  synchronized A get() { ret v; }
  synchronized bool has() { ret v != null; }
  synchronized void clear() { v = null; }
}