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bh=1knqZPMUsaX+yoq7MWKs2zXJ54W0q5xmyLXjMaMzWZ8=; b=RJz+SO8SuFx/iaB/82POIZnBJhg9FeNVp6psxkt6tu9GByqTM8PkZGM6tVp8nx0dHZ KA/URA8rGL9axQnvwsvbs4lnpry+1Yyjf4bi2fez2gr/XN/9gv12o5vsR4jp0eMC09QU IKVD8CmlldRkpJsil7RsVZYu4bQr6OA4yDCjk2FPblf7LQSxA6Z1hK5wR18HCsZ3OlZP rbjDyFXUWaW8JQIw6biGk8kJLeu3intGeuWwyUlkktcDd6Pt4SJYpfYVticlKv8d92r+ /PuIX5X0lp7xIP0BflXCgrIi3vWRIXRY4hjZzjlQLoeTNXaGDFVzBv+w+ikYYz26m7zX KjzA== X-Gm-Message-State: ABy/qLZdXzugmKS08mB8e2N8c3LPMpsWqAVAILcqE0unj9xZT96muzgt MzTOcukQ4LJuNGunozF1BPGbz56UhUJDXa7UySJJeg== X-Google-Smtp-Source: APBJJlHvcyfpchZHG7vFvTEaS9JQ9duFgb6VJOoYmfOWDMGXf2/UmZ458zMdj3teDrsbjKJ7SadOUo7H5q9MOmRHKk4= X-Received: by 2002:a2e:9f14:0:b0:2b6:e2c1:9816 with SMTP id u20-20020a2e9f14000000b002b6e2c19816mr495332ljk.20.1689228769489; Wed, 12 Jul 2023 23:12:49 -0700 (PDT) MIME-Version: 1.0 References: <083477A3-A5D3-49B1-BF6F-D148C6BCAA54@kba.biglobe.ne.jp> In-Reply-To: <083477A3-A5D3-49B1-BF6F-D148C6BCAA54@kba.biglobe.ne.jp> From: Bart Schaefer Date: Wed, 12 Jul 2023 23:12:38 -0700 Message-ID: Subject: Re: a few question about named reference To: Jun T Cc: zsh-workers@zsh.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Seq: 51929 Archived-At: X-Loop: zsh-workers@zsh.org Errors-To: zsh-workers-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-workers-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: On Wed, Jul 12, 2023 at 9:06=E2=80=AFPM Jun T wrote: > > [1] what does 'typeset -n ref' do when a variable 'ref' already exists? As of workers/51402, it does the same thing as ref=3Dxx typeset -n ref So ... > (1a) removing a named reference > > ... so to remove a > named reference, use either `unset -n pname' or one of: > typeset -n pname > typeset +n pname > followed by > unset pname > > But: > % typeset -n pname # this does nothing > % typeset -p pname > typeset -n pname=3Di # still points to i [...] > > Just fix the document? Yep, documentation dates from the previous patches. Need to update. > (1b) converting a scalar into named reference > > In the first post by Bart about the named reference (worker/51360=E2=81= =A9): > > > One difference from ksh93 is that you can't convert scalars into > > namerefs > > But it seems we can convert a scalar into nameref: That also changed in 51402, from the commit log: * Ksh-style "foo=3Dbar; typeset -n foo" creates foo=3Dbar reference > [2] readonly named reference > > So we can't remove the readonly attribute (and will not be able > to remove/unset it). Is this intentional? Yes, that's how it works in ksh. > [3] can named reference be in 'unset' state? > > It seems resolve_nameref() in params.c resets the PM_UNSET bit. > I feel it would be simpler to ignore typesettounset when creating > a nameref. That will need to be looked at. Thanks for noticing.