(commandFailed: StringAdd).self
(commandFailed: StringFormat).self
(commandFailed: ArrowAssoc[CommandFailed]).x
(Since version 2.10.0) Use leftOfArrow
instead
(commandFailed: Ensuring[CommandFailed]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
When a command fails it will be replied to with this message type, wrapping the failing command object.