private void doValidityChecks(@NotNull StartMarker marker, @Nullable StartMarker before) {
    if (marker.isDone()) {
      LOG.error("Marker already done.");
    }

    if (myDebugMode) {
      myProduction.doHeavyChecksOnMarkerDone(marker, before);
    }
  }
private void doValidityChecks(@NotNull StartMarker marker, @Nullable StartMarker before)