lambda lambda-list ⟦ {declaration}* | documentation  ⟧ {form}* → function

lambda-list — an ordinary lambda list.

declaration — a declare expression; not evaluated.

documentation — a string; not evaluated.

form — a form.

function — a function.

Provides a shorthand notation for a function special form involving a lambda expression such that:

   (lambda lambda-list ⟦ {declaration}* | documentation  ⟧ {form}*) 
≡ (function (lambda lambda-list ⟦ {declaration}* | documentation  ⟧ {form}*)) 
≡ #'(lambda lambda-list ⟦ {declaration}* | documentation  ⟧ {form}*)

(funcall (lambda (x) (+ x 3)) 4) → 7

lambda (symbol)

This macro could be implemented by:

(defmacro lambda (&whole form &rest bvl-decls-and-body) 
  (declare (ignore bvl-decls-and-body)) 
  `#',form)