Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/console/Tests/Fixtures/application_run2.txt

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+Usage:
+  help [options] [--] [<command_name>]
+
+Arguments:
+  command               The command to execute
+  command_name          The command name [default: "help"]
+
+Options:
+      --xml             To output help as XML
+      --format=FORMAT   The output format (txt, xml, json, or md) [default: "txt"]
+      --raw             To output raw command help
+  -h, --help            Display this help message
+  -q, --quiet           Do not output any message
+  -V, --version         Display this application version
+      --ansi            Force ANSI output
+      --no-ansi         Disable ANSI output
+  -n, --no-interaction  Do not ask any interactive question
+  -v|vv|vvv, --verbose  Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
+
+Help:
+ The help command displays help for a given command:
+ 
+   php app/console help list
+ 
+ You can also output the help in other formats by using the --format option:
+ 
+   php app/console help --format=xml list
+ 
+ To display the list of available commands, please use the list command.