#### 14.2.3 cons [System Class] ¶

#### Class Precedence List:: ¶

cons, list, sequence, t

#### Description:: ¶

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.

#### Compound Type Specifier Kind:: ¶

Specializing.

#### Compound Type Specifier Syntax:: ¶

(`cons`{`[`car-typespec [cdr-typespec]`]`})

#### Compound Type Specifier Arguments:: ¶

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 *.

#### Compound Type Specifier Description:: ¶

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.)

#### See Also:: ¶

Left-Parenthesis, Printing Lists and Conses