cons, list, sequence, t
A cons is a compound object having two components, called the car and cdr. These form a dotted pair. Each component can be any object.
Specializing.
(cons{[car-typespec [cdr-typespec]]})
car-typespec---a type specifier, or the symbol *. The default is the symbol *.
cdr-typespec---a type specifier, or the symbol *. The default is the symbol *.
This denotes the set of conses whose car is constrained to be of type car-typespec and whose cdr is constrained to be of type cdr-typespec. (If either car-typespec or cdr-typespec is *, it is as if the type t had been denoted.)
section Left-Parenthesis, section Printing Lists and Conses
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