throw new UnsupportedOperationException("checkUserLoginable is not supported.");
    }

    /**
     * Checks the credential using the provided credential checker.
     * This method is not supported in the Fess implementation.
     *
     * @param checker the credential checker to use
     * @throws UnsupportedOperationException always thrown as this method is not supported
     */
    @Override

## Use the instance as a dependency { #use-the-instance-as-a-dependency }

Then, we could use this `checker` in a `Depends(checker)`, instead of `Depends(FixedContentQueryChecker)`, because the dependency is the instance, `checker`, not the class itself.

And when solving the dependency, **FastAPI** will call this `checker` like:

```Python
checker(q="somequery")
```

        This structured process helps ensure translations can be properly maintained long-term.
  - type: checkboxes
    id: checks
    attributes:
      label: Initial Checks
      description: Please confirm and check all the following options.
      options:
        - label: I checked that this language is not already being translated in FastAPI docs.
          required: true

    public FactoryMethodReturnValueTester testSerializable() throws Exception {
      for (Invokable<?, ?> factory : getFactoriesToTest()) {
        Object instance = instantiate(factory);
        if (instance != null) {
          try {
            SerializableTester.reserialize(instance);
          } catch (Exception e) { // sneaky checked exception

        // handleDFSReferral(DfsReferralData, String): String, no checked exceptions
        Method m3 = clazz.getMethod("handleDFSReferral", DfsReferralData.class, String.class);
        assertEquals(String.class, m3.getReturnType());
        assertEquals(2, m3.getParameterCount());
        assertEquals(0, m3.getExceptionTypes().length);

        // Package check to ensure we are validating the correct type

        verify(transport).isSigningOptional();
        verify(transport).isSigningEnforced();
    }

    // Error propagation: signing checks may throw SmbException
    @Test
    @DisplayName("signing checks propagate SmbException")
    void signingChecks_throw() throws Exception {
        doThrow(new SmbException("opt error")).when(transport).isSigningOptional();

     *
     * @param field
     *            the field to check. Must not be null.
     * @return true if public, static, and final, false otherwise
     */
    public static boolean isPublicStaticFinalField(final Field field) {
        assertArgumentNotNull("field", field);

        return isPublicStaticFinal(field.getModifiers());
    }

    /**

    public FactoryMethodReturnValueTester testSerializable() throws Exception {
      for (Invokable<?, ?> factory : getFactoriesToTest()) {
        Object instance = instantiate(factory);
        if (instance != null) {
          try {
            SerializableTester.reserialize(instance);
          } catch (Exception e) { // sneaky checked exception

      } catch (Exception | Error unsafeFailure) { // sneaky checked exception
        thrownUnsafeFailure = unsafeFailure;
        // Catch absolutely everything and fall through to AtomicReferenceFieldUpdaterAtomicHelper.
        try {
          helper = new AtomicReferenceFieldUpdaterAtomicHelper();
        } catch (Exception // sneaky checked exception
            | Error atomicReferenceFieldUpdaterFailure) {

      } catch (Exception | Error unsafeFailure) { // sneaky checked exception
        thrownUnsafeFailure = unsafeFailure;
        // Catch absolutely everything and fall through to AtomicReferenceFieldUpdaterAtomicHelper.
        try {
          helper = new AtomicReferenceFieldUpdaterAtomicHelper();
        } catch (Exception // sneaky checked exception
            | Error atomicReferenceFieldUpdaterFailure) {