static void forgetTranspiledStandardFunctions(S... functions) {
  forgetTranspiledStandardFunctions(lithashset(functions));
}

static void forgetTranspiledStandardFunctions(Iterable<S> functions) {
  Set<S> functionSet = asSet(functions);
  for (File f : listFilesWithExtension(javaxCachesDir("Transpiled Standard Functions"), ".functions")) {
    if (!containsOneOf(lines(loadTextFile(f)), functionSet)) continue;
    deleteFile(replaceExtension(f, ".java"));
    deleteFile(f);
  }
}