static volatile PersistableThrowable _handleException_lastException;
static L _handleException_onException = synchroList(ll(f printStackTrace2));

static void _handleException(Throwable e) {
  _handleException_lastException = persistableThrowable(e);
  
  Throwable e2 = innerException(e);
  if (e2.getClass() == RuntimeException.class && eq(e2.getMessage(), "Thread cancelled."))
    ret;
    
  for (O f : cloneList(_handleException_onException)) try {
    callF(f, e);
  } catch e3 {
    printStackTrace2(e3); // not using pcall here - it could lead to endless loops
  }
}