CLHS: Function SHADOWING-IMPORT

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Function SHADOWING-IMPORT

Syntax:

shadowing-import 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:

shadowing-import is like import, but it does not signal an error even if the importation of a symbol would shadow some symbol already accessible in package.

shadowing-import inserts each of symbols into package as an internal symbol, regardless of whether another symbol of the same name is shadowed by this action. If a different symbol of the same name is already present in package, that symbol is first uninterned from package. The new symbol is added to package's shadowing-symbols list.

shadowing-import does name-conflict checking to the extent that it checks whether a distinct existing symbol with the same name is accessible; if so, it is shadowed by the new symbol, which implies that it must be uninterned if it was present in package.

Examples:

     (in-package "COMMON-LISP-USER") =>  #<PACKAGE "COMMON-LISP-USER">
     (setq sym (intern "CONFLICT")) =>  CONFLICT
     (intern "CONFLICT" (make-package 'temp)) =>  TEMP::CONFLICT, NIL
     (package-shadowing-symbols 'temp) =>  NIL
     (shadowing-import sym 'temp) =>  T
     (package-shadowing-symbols 'temp) =>  (CONFLICT)

Side Effects:

shadowing-import changes the state of the package system in such a way that the consistency rules do not hold across the change.

package's shadowing-symbols list is modified.

Affected By:

Current state of the package system.

Exceptional Situations: None.

See Also:

import, unintern, package-shadowing-symbols

Notes: None.

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- PACKAGE-FUNCTION-CONSISTENCY:MORE-PERMISSIVE

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