// TODO: unload src libs when not used anymore,
// especially: old versions
static Map<File, ClassLoader> hotwire_srcLibsMap = syncMap();

static JavaXClassLoader hotwire_makeClassLoader_stickyAndSrcLibs(L<File> files) {
  new L<File> files2;
  new Map<S, ClassLoader> parents; // key = package/class name
  for (File f : files) {
    S libID = DiskSnippetCache_fileToLibID(f);
    if (libID != null && isStickyLibrary(libID)) {
      if (addLibrary(libID))
        print("Retaining sticky library " + libID);
    } else if (f != first(files) && isMarkedAsSrcLib(libID = isFile(f) ? loadTextFileFromZip(f, "progID") : null)) {
      ClassLoader c = hotwire_srcLibsMap.get(f);
      S jname = dropSuffix(".java", getJavaSrcNameOfSrcLib(libID));
      assertNempty(libID, jname);
      if (c == null) {
        print("Hotwiring src lib " + libID + " / " + f);
        Class cc = hotwireSpecialMainClass(libID, jname.replace("/", ".");
        setCreatorTo(cc, mc());
        c = cc.getClassLoader();
        hotwire_srcLibsMap.put(f, c);
      }
      S pkg = beforeSlash(jname);
      print("Linking src lib " + libID + " as " + pkg);
      parents.put(pkg, c);
    } else
      files2.add(f);
  }

  JavaXClassLoaderWithParents cl = new(null, files2, myClassLoader()); // progID is set later
  putAll(cl.parentMap, parents);
  ret cl;
}

Began life as a copy of #1020749