(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
Whenever a command cannot be completed, the queried actor will reply with this message, wrapping the original command which failed.