10.2.18 makunbound [Function]

makunbound symbol ⇒ symbol

Arguments and Values::

symbol—a symbol

Description::

Makes the symbol be unbound, regardless of whether it was previously bound.

Examples::

 (setf (symbol-value 'a) 1)
 (boundp 'a) ⇒  true
 a ⇒  1
 (makunbound 'a) ⇒  A
 (boundp 'a) ⇒  false

Side Effects::

The value cell of symbol is modified.

Exceptional Situations::

Should signal an error of type type-error if symbol is not a symbol.

See Also::

boundp , fmakunbound