static SS gStandardRewrites_cache;

static synchronized SS gStandardRewrites() {
  if (gStandardRewrites_cache == null) {
    gStandardRewrites_cache = new HashMap;
    pcall {
      for (Rule rule : parseRules(loadSnippet("#1004468")))
        gStandardRewrites_cache.put(first(rule.in), first(rule.out));
    }
  }
  ret gStandardRewrites_cache;
}