static void free_node_table(cmark_mem *mem, void *ptr) {
  node_table *t = (node_table *)ptr;
  mem->free(t->alignments);
  mem->free(t);
}
static void free_node_table(cmark_mem *mem, void *ptr) {
  node_table *t = (node_table *)ptr;
  mem->free(t->alignments);
  mem->free(t);
}