docs: private int registerBlockInstance() {
          int blockInstNo = blockInstTabCnt++;
          if (blockInstTab == null) {
              blockInstTab = new BlockInstTabRec[64];
          }
          if (blockInstTabCnt > blockInstTab.length) {
              blockInstTab = (BlockInstTabRec[]) MiniTemplatorParser.resizeArray(blockInstTab, 2 * blockInstTabCnt);
          }
          blockInstTab[blockInstNo] = new BlockInstTabRec();
          return blockInstNo;
      }