// module ID => sticky library IDs
static MultiMap<S> dm_stickyLibsByModule() {
  new MultiMap<S> mm;
  for (S mod : dm_listModuleIDs()) {
    if (eq(t, '_stickyLibs) || startsWith(t, '_stickyLibs_)) {
      Class main = dm_modMainClass(mod);
      for (S field : fieldNamesStartingWith(main, "_stickyLibs_"))
        mm.putAll(mod, (Collection<S>) get(main, field));
    }
  }
  ret uniquifyMultiMapValues(mm);
}