26 files declare their use of RoutingEvents

AccessRouteAlterSubscriber.php in core/modules/system/src/EventSubscriber/AccessRouteAlterSubscriber.php
AdminRouteSubscriber.php in core/modules/system/src/EventSubscriber/AdminRouteSubscriber.php
CacheRouterRebuildSubscriber.php in core/lib/Drupal/Core/EventSubscriber/CacheRouterRebuildSubscriber.php
ContentModerationRouteSubscriber.php in core/modules/content_moderation/src/Routing/ContentModerationRouteSubscriber.php
ContentTranslationRouteSubscriber.php in core/modules/content_translation/src/Routing/ContentTranslationRouteSubscriber.php
EntityResourcePostRouteSubscriber.php in core/modules/rest/src/EventSubscriber/EntityResourcePostRouteSubscriber.php
EntityRouteAlterSubscriber.php in core/lib/Drupal/Core/EventSubscriber/EntityRouteAlterSubscriber.php
EntityRouteProviderSubscriber.php in core/lib/Drupal/Core/EventSubscriber/EntityRouteProviderSubscriber.php
InstallerPerformanceTest.php in core/tests/Drupal/FunctionalTests/Installer/InstallerPerformanceTest.php
InstallerRouterTest.php in core/tests/Drupal/FunctionalTests/Installer/InstallerRouterTest.php
InstallerTest.php in core/tests/Drupal/FunctionalTests/Installer/InstallerTest.php
LayoutBuilderRoutes.php in core/modules/layout_builder/src/Routing/LayoutBuilderRoutes.php
MenuRouterRebuildSubscriber.php in core/lib/Drupal/Core/EventSubscriber/MenuRouterRebuildSubscriber.php
NoBigPipeRouteAlterSubscriber.php in core/modules/big_pipe/src/EventSubscriber/NoBigPipeRouteAlterSubscriber.php
ParamConverterSubscriber.php in core/lib/Drupal/Core/EventSubscriber/ParamConverterSubscriber.php
PathRootsSubscriber.php in core/lib/Drupal/Core/EventSubscriber/PathRootsSubscriber.php
PerformanceTestRecorder.php in core/lib/Drupal/Core/Test/PerformanceTestRecorder.php
ResourceRoutes.php in core/modules/rest/src/Routing/ResourceRoutes.php
RouteBuilderTest.php in core/tests/Drupal/Tests/Core/Routing/RouteBuilderTest.php
RouteMethodSubscriber.php in core/lib/Drupal/Core/EventSubscriber/RouteMethodSubscriber.php
RouteSubscriber.php in core/modules/block_content/src/Routing/RouteSubscriber.php
RouteSubscriber.php in core/modules/field_ui/src/Routing/RouteSubscriber.php
RouteSubscriber.php in core/modules/views/src/EventSubscriber/RouteSubscriber.php
RouteSubscriber.php in core/modules/serialization/tests/modules/user_route_alter_test/src/Routing/RouteSubscriber.php
RouteSubscriber.php in core/modules/config_translation/src/Routing/RouteSubscriber.php
UserRouteAlterSubscriber.php in core/modules/serialization/src/EventSubscriber/UserRouteAlterSubscriber.php

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