All classes that implement MapperInterface in Service Container 7.2

class \Drupal\Component\Plugin\PluginManagerBase implements PluginManagerInterface uses DiscoveryTrait
class \Drupal\Core\Plugin\DefaultPluginManager implements CachedDiscoveryInterface, PluginManagerInterface uses DiscoveryCachedTrait
class \Drupal\Tests\service_container\Plugin\TestFallbackPluginManager implements FallbackPluginManagerInterface
class \Drupal\service_container\DependencyInjection\ServiceProviderPluginManager
class \Drupal\service_container\Plugin\ContainerAwarePluginManager implements PluginManagerInterface
class \Drupal\service_container\Plugin\DefaultPluginManager
class \Drupal\service_container\Plugin\PluginManagerBase implements PluginManagerInterface

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