PLN CDR draft: Issue 7

1. Issue 7 (Multiple local nicknames)

1.1. Description

It is not clear whether package-locally-nicknamed-by-list should be allowed to return a list with duplicate entries (when there are multiple local nicknames in one package).

1.2. Examples

(defpackage #:foo
  (:use)
  (:local-nicknames (#:bar #:cl)
                    (#:baz #:cl)))
(mapcar #'package-name (package-locally-nicknamed-by-list '#:cl))
; => ("FOO")  (sbcl, acl, clasp, lispworks)
; => ("FOO" "FOO")  (ccl, ecl, abcl)

1.3. Current behavior

sbcl, acl, clasp, lispworks: package-locally-nicknamed-by-list never contains duplicate entries.

ccl, abcl, ecl: package-locally-nicknamed-by-list might contain duplicate entries.

1.4. Proposal NO-DUPLICATES

package-locally-nicknamed-by-list should return a list without duplicate entries.