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.
Examples: None.
See Also:
defun, flet, defmacro, macrolet, Section 3.1.2 (The Evaluation Model)
Notes: None.