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Showing content from http://www.lispworks.com/documentation/HyperSpec/Body/f_fmakun.htm below:

CLHS: Function FMAKUNBOUND

Syntax:

fmakunbound name => name

Pronunciation:

[,ef'makuhn,band] or [,ef'maykuhn,band]

Arguments and Values:

name---a function name.

Description:

Removes the function or macro definition, if any, of name in the global environment.

Examples:

(defun add-some (x) (+ x 19)) =>  ADD-SOME
 (fboundp 'add-some) =>  true
 (flet ((add-some (x) (+ x 37)))
    (fmakunbound 'add-some)
    (add-some 1)) =>  38
 (fboundp 'add-some) =>  false

Side Effects: None.

Affected By: None.

Exceptional Situations:

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

The consequences are undefined if name is a special operator.

See Also:

fboundp, makunbound

Notes: None.

• FUNCTION-NAME:LARGE

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