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