Self-Evaluating Objects (ANSI and GNU Common Lisp Document)

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#### 3.1.2.12 Self-Evaluating Objects

A form that is neither a symbol nor a cons is defined to be a self-evaluating object. Evaluating such an object yields the same object as a result.

Certain specific symbols and conses might also happen to be “self-evaluating” but only as a special case of a more general set of rules for the evaluation of symbols and conses; such objects are not considered to be self-evaluating objects.

The consequences are undefined if literal objects (including self-evaluating objects) are destructively modified.