lambda-list-keywords (Constant Variable)

Constant Value:

a list, the elements of which are implementation-dependent, but which must contain at least the symbols &allow-other-keys, &aux, &body, &environment, &key, &optional, &rest, and &whole.

Description:

A list of all the lambda list keywords used in the implementation, including the additional ones used only by macro definition forms.

See Also:

defun, flet, defmacro, macrolet, Section 3.1.2 (The Evaluation Model)