Determines whether or not a list is nil
Supported Platforms: Windows and Mac OS
(vl-consp list-variable)
Type: Integer, Real, String, List, Subroutine, ads_name, T, nil, or catch-all-apply-error
A list.
Type: T or nil
T, if list-variable is a list and is not nil; otherwise nil.
The vl-consp function determines whether a variable contains a valid list definition.
(vl-consp nil) nil (vl-consp t) nil (vl-consp (cons 0 "LINE")) T