Denotes how to handle an operation on a missing action.
lispworks
:warn
The variable *handle-missing-action-in-action-list* is a keyword; one of :warn, :error or :ignore, denoting how to handle an operation on a missing action. Its initial value is :warn. It is used by undefine-action.
LispWorks® User Guide and Reference Manual - 01 Dec 2021 19:30:41