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| ANSI Common Lisp 11 Packages 11.2 Dictionary of Packages
11.2.14 unexport | Function
  Syntax: unexport symbols `&optional` package t Arguments and Values: symbols - a designator for a list of symbols. package - a package designator. The default is the current package. Description: unexport reverts external symbols in package to internal status; it undoes the effect of export. unexport works only on symbols present in package, switching them back to internal status. If unexport is given a symbol that is already accessible as an internal symbol in package, it does nothing. Examples:
       (in-package "COMMON-LISP-USER")  #<PACKAGE "COMMON-LISP-USER">
       (export (intern "CONTRABAND" (make-package 'temp)) 'temp)   T
       (find-symbol "CONTRABAND")   NIL, NIL
       (use-package 'temp)   T
       (find-symbol "CONTRABAND")   CONTRABAND, :INHERITED
       (unexport 'contraband 'temp)   T
       (find-symbol "CONTRABAND")   NIL, NIL
Side Effects: Package system is modified. Affected By: Current state of the package system. Exceptional Situations: If unexport is given a symbol not accessible in package at all, an error of type package-error is signaled. The consequences are undefined if package is the `keyword` package or the `common-lisp` package. See Also: export, Section 11.1 Package Concepts Allegro CL Implementation Details: None.

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