minor symfony#28610 [Form] Check for Intl availibility (ro0NL)

This PR was merged into the 4.2-dev branch.

Discussion
----------

[Form] Check for Intl availibility

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | #...   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

Same as symfony#28513 for the form component

Commits
-------

73c688c [Form] Check for Intl availibility

Author: fabpot

src/Symfony/Component/Form/Extension/Core/Type/CountryType.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
 use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
 use Symfony\Component\Form\ChoiceList\Loader\IntlCallbackChoiceLoader;
+use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Intl\Intl;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
@@ -41,6 +42,10 @@ public function configureOptions(OptionsResolver $resolver)
     {
         $resolver->setDefaults(array(
             'choice_loader' => function (Options $options) {
+                if (!class_exists(Intl::class)) {
+                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s".', static::class));
+                }
+
                 $choiceTranslationLocale = $options['choice_translation_locale'];
 
                 return new IntlCallbackChoiceLoader(function () use ($choiceTranslationLocale) {

src/Symfony/Component/Form/Extension/Core/Type/CurrencyType.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
 use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
 use Symfony\Component\Form\ChoiceList\Loader\IntlCallbackChoiceLoader;
+use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Intl\Intl;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
@@ -41,6 +42,10 @@ public function configureOptions(OptionsResolver $resolver)
     {
         $resolver->setDefaults(array(
             'choice_loader' => function (Options $options) {
+                if (!class_exists(Intl::class)) {
+                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s".', static::class));
+                }
+
                 $choiceTranslationLocale = $options['choice_translation_locale'];
 
                 return new IntlCallbackChoiceLoader(function () use ($choiceTranslationLocale) {

src/Symfony/Component/Form/Extension/Core/Type/LanguageType.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
 use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
 use Symfony\Component\Form\ChoiceList\Loader\IntlCallbackChoiceLoader;
+use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Intl\Intl;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
@@ -41,6 +42,10 @@ public function configureOptions(OptionsResolver $resolver)
     {
         $resolver->setDefaults(array(
             'choice_loader' => function (Options $options) {
+                if (!class_exists(Intl::class)) {
+                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s".', static::class));
+                }
+
                 $choiceTranslationLocale = $options['choice_translation_locale'];
 
                 return new IntlCallbackChoiceLoader(function () use ($choiceTranslationLocale) {

src/Symfony/Component/Form/Extension/Core/Type/LocaleType.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
 use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
 use Symfony\Component\Form\ChoiceList\Loader\IntlCallbackChoiceLoader;
+use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Intl\Intl;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
@@ -41,6 +42,10 @@ public function configureOptions(OptionsResolver $resolver)
     {
         $resolver->setDefaults(array(
             'choice_loader' => function (Options $options) {
+                if (!class_exists(Intl::class)) {
+                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s".', static::class));
+                }
+
                 $choiceTranslationLocale = $options['choice_translation_locale'];
 
                 return new IntlCallbackChoiceLoader(function () use ($choiceTranslationLocale) {