presto-main/src/main/java/io/prestosql/execution/resourcegroups/InternalResourceGroupManager.java/InternalResourceGroupManager/cast
class InternalResourceGroupManager:    @SuppressWarnings("unchecked")
    private static <C> ResourceGroupConfigurationManager<C> cast(ResourceGroupConfigurationManager<?> manager)
    {
        return (ResourceGroupConfigurationManager<C>) manager;
    }