45 files declare their use of Unicode in Drupal 8
- BookManager.php in core/modules/ book/ src/ BookManager.php 
- bootstrap.inc in core/includes/ bootstrap.inc 
- Functions that need to be loaded on every Drupal request.
- CommentAdminOverview.php in core/modules/ comment/ src/ Form/ CommentAdminOverview.php 
- CommentAdminTest.php in core/modules/ comment/ tests/ src/ Functional/ Views/ CommentAdminTest.php 
- CommentForm.php in core/modules/ comment/ src/ CommentForm.php 
- CommentPermalinkFormatter.php in core/modules/ comment/ src/ Plugin/ Field/ FieldFormatter/ CommentPermalinkFormatter.php 
- CommentTestTrait.php in core/modules/ comment/ src/ Tests/ CommentTestTrait.php 
- Connection.php in core/lib/ Drupal/ Core/ Database/ Driver/ mysql/ Connection.php 
- CssOptimizer.php in core/lib/ Drupal/ Core/ Asset/ CssOptimizer.php 
- DateTestBase.php in core/modules/ datetime/ tests/ src/ Functional/ DateTestBase.php 
- DbLogController.php in core/modules/ dblog/ src/ Controller/ DbLogController.php 
- DbLogTest.php in core/modules/ dblog/ tests/ src/ Functional/ DbLogTest.php 
- DefaultProcessor.php in core/modules/ aggregator/ src/ Plugin/ aggregator/ processor/ DefaultProcessor.php 
- DependencyTest.php in core/modules/ system/ tests/ src/ Functional/ Module/ DependencyTest.php 
- file.module in core/modules/ file/ file.module 
- Defines a "managed_file" Form API field and a "file" field for Field module.
- FileSystem.php in core/lib/ Drupal/ Core/ File/ FileSystem.php 
- filter.module in core/modules/ filter/ filter.module 
- Framework for handling the filtering of content.
- HandlerBase.php in core/modules/ views/ src/ Plugin/ views/ HandlerBase.php 
- ImageStyleEditForm.php in core/modules/ image/ src/ Form/ ImageStyleEditForm.php 
- InOperator.php in core/modules/ views/ src/ Plugin/ views/ filter/ InOperator.php 
- install.inc in core/includes/ install.inc 
- API functions for installing modules and themes.
- JsOptimizer.php in core/lib/ Drupal/ Core/ Asset/ JsOptimizer.php 
- LinkFieldTest.php in core/modules/ link/ tests/ src/ Functional/ LinkFieldTest.php 
- LinkFormatter.php in core/modules/ link/ src/ Plugin/ Field/ FieldFormatter/ LinkFormatter.php 
- LinkSeparateFormatter.php in core/modules/ link/ src/ Plugin/ Field/ FieldFormatter/ LinkSeparateFormatter.php 
- MailTest.php in core/modules/ system/ tests/ src/ Kernel/ Mail/ MailTest.php 
- MenuLink.php in core/modules/ menu_link_content/ src/ Plugin/ migrate/ source/ MenuLink.php 
- MenuLinkTest.php in core/modules/ menu_link_content/ tests/ src/ Kernel/ Plugin/ migrate/ source/ MenuLinkTest.php 
- MenuParentFormSelector.php in core/lib/ Drupal/ Core/ Menu/ MenuParentFormSelector.php 
- OverviewTerms.php in core/modules/ taxonomy/ src/ Form/ OverviewTerms.php 
- PathAliasListBuilder.php in core/modules/ path/ src/ PathAliasListBuilder.php 
- PathBasedBreadcrumbBuilder.php in core/modules/ system/ src/ PathBasedBreadcrumbBuilder.php 
- PathProcessorLanguage.php in core/modules/ language/ src/ HttpKernel/ PathProcessorLanguage.php 
- PhpMail.php in core/lib/ Drupal/ Core/ Mail/ Plugin/ Mail/ PhpMail.php 
- Schema.php in core/lib/ Drupal/ Core/ Database/ Driver/ mysql/ Schema.php 
- SchemaTest.php in core/tests/ Drupal/ KernelTests/ Core/ Database/ SchemaTest.php 
- search.module in core/modules/ search/ search.module 
- Enables site-wide keyword searching.
- SearchPageTextTest.php in core/modules/ search/ tests/ src/ Functional/ SearchPageTextTest.php 
- SearchPluginBase.php in core/modules/ search/ src/ Plugin/ SearchPluginBase.php 
- system.install in core/modules/ system/ system.install 
- Install, update and uninstall functions for the system module.
- text.module in core/modules/ text/ text.module 
- Defines simple text field types.
- unicode.inc in core/includes/ unicode.inc 
- Provides Unicode-related conversions and operations.
- UnicodeTest.php in core/tests/ Drupal/ Tests/ Component/ Utility/ UnicodeTest.php 
- user.module in core/modules/ user/ user.module 
- Enables the user registration and login system.
- VocabularyPermissionsTest.php in core/modules/ taxonomy/ tests/ src/ Functional/ VocabularyPermissionsTest.php 
