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Type Specifier OR

Compound Type Specifier Kind

Combining.

Compound Type Specifier Syntax

or typespec*

Compound Type Specifier Arguments

typespec - a type specifier.

Compound Type Specifier Description

This denotes the set of all objects of the type determined by the union of the typespecs. For example, the type list by definition is the same as (or null cons). Also, the value returned by position is an object of type (or null (integer 0 *)); i.e. either nil or a non-negative integer.

* is not permitted as an argument.

The type specifiers (or) and nil are equivalent. The symbol or is not valid as a type specifier; and, specifically, it is not an abbreviation for (or).

\issue{TYPE-SPECIFIER-ABBREVIATION:X3J13-JUN90-GUESS}