+ indirect
+ ;; true if the last reference has been deleted (and new references
+ ;; should not be made)
+ deleted
+ ;; This is set by physical environment analysis if, should it be an
+ ;; indirect lambda-var, an actual value cell object must be
+ ;; allocated for this variable because one or more of the closures
+ ;; that refer to it are not dynamic-extent. Note that both
+ ;; attributes must be set for the value-cell object to be created.
+ explicit-value-cell
+ )