The following compound presentation types are provided because they implement some common idioms.
token-or-type
Summary: A compound type that is used to select one of a set of special tokens, or an object of type type . tokens is anything that can be used as the sequence parameter to member-alist ; typically it is a list of symbols.
null-or-type
Summary: A compound type that is used to select nil , whose printed representation is the special token "None," or an object of type type.
type-or-string
Summary: A compound type that is used to select an object of type type or an arbitrary string, for example: (clim:type-or-string integer) . Any input that accept cannot parse as the representation of an object of type type is returned as a string.