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                         PLN CDR DRAFT: ISSUE 9

                                Gleefre
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1 Issue 9 (Empty package local name)
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1.1 Description
───────────────

  It is not clear whether it should be allowed to use the empty string
  `""' as a local nickname, and in the case it is allowed, whether it
  should affect the keyword symbol syntax `:xxxx'.


1.2 Examples
────────────

  ┌────
  │ (defpackage #:foo
  │   (:use #:cl)
  │   (:local-nicknames ("" #:cl)))
  │ 
  │ (in-package #:foo)
  │ 
  │ (package-name (symbol-package ':*package*))
  │ ; => "KEYWORD"  (sbcl, ccl, ecl, abcl, clasp, lispworks)
  │ ; => "COMMON-LISP"  (acl)
  │ 
  │ (package-name (symbol-package '||:*package*))
  │ ; => "KEYWORD"  (ecl, clasp, lispworks)
  │ ; => "COMMON-LISP"  (sbcl, ccl, acl)
  │ ; abcl errors
  └────


1.3 Current behavior
────────────────────

  sbcl, ccl: `:xxxx' is read as a keyword; `||:xxxx' is read as a symbol
  in the package named or nicknamed `""'.

  ecl, clasp, lispworks: Both `||:xxxx' and `:xxxx' are read as a
  keyword.

  acl:

  Both `:xxxx' and `||:xxxx' are read as a symbol in the package named
  or nicknamed `""' which is a /global nickname/ for the `#:KEYWORD'
  package, but can be shadowed by a /local nickname/.

  abcl: `:xxxx' is read as a keyword; `||:xxxx' syntax cannot be read
  (attemts result in an error).


1.4 Proposal ALLOW-KEEP-KEYWORDS
────────────────────────────────

  The `""' local nickname should be explicitely allowed. `:xxxx' should
  be always read as a keyword regardless of package names or
  nicknames. `||:xxxx' should be read as a symbol in the package named
  or nicknamed by `""'.


1.5 Proposal ALLOW-FUN
──────────────────────

  The `""' local nickname should be explicitely allowed. Both `:xxxx'
  and `||:xxxx' should be read as a symbol in the package named or
  nicknamed by `""'.


1.6 Links
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  See also the [WSCL issue 63].


[WSCL issue 63] <https://github.com/s-expressionists/wscl/issues/63>