From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-3.3 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, HTML_MESSAGE,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 12724 invoked from network); 7 Jan 2021 22:30:14 -0000 Received: from zero.zsh.org (2a02:898:31:0:48:4558:7a:7368) by inbox.vuxu.org with ESMTPUTF8; 7 Jan 2021 22:30:14 -0000 ARC-Seal: i=1; cv=none; a=rsa-sha256; d=zsh.org; s=rsa-20200801; t=1610058614; b=Y8u+7GKXAHfDD9F3fEVh9XiX+nb3Y9nBa1obB+FlzjbgzB4nSw8Vvl84nHJu8LGaGIwfhfi+aQ jNWPcRXZegYdPUD/sbS7a1WT59p+B/hJxmFZPyHClIZ6b0uVftGF1Cd2SoOQdnDXPgaN+2zI33 Nmpe8dv6K1DFTsL4ysa66b1m2rvgpL/9i0fx3n39beuE8px557nQbBYIAhkwoTZsHWfFsv40CV qJvs5V70iFIzdEcaysYrbuCTO5d2ASoqSAuI+9TEd0tggClCTNI1BSI6DcaSDxZuJmUd6Bwamo 0IEgqJ/oT166y2odcoxovbyNsMFgzy+TXXK3uXab6Z9J/w==; ARC-Authentication-Results: i=1; zsh.org; iprev=pass (mail-oi1-f179.google.com) smtp.remote-ip=209.85.167.179; dkim=pass header.d=brasslantern-com.20150623.gappssmtp.com header.s=20150623 header.a=rsa-sha256; dmarc=none header.from=brasslantern.com; arc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed; d=zsh.org; s=rsa-20200801; t=1610058614; bh=OjLZBMOOX45Dk5FBD2uU8E57cEP3JAqJFnW8HaM1hpM=; h=List-Archive:List-Owner:List-Post:List-Unsubscribe:List-Subscribe:List-Help: List-Id:Sender:Content-Type:Cc:To:Subject:Message-ID:Date:From:In-Reply-To: References:MIME-Version:DKIM-Signature:DKIM-Signature; b=pwzZ5HmurcbOuM71tMLC/wVYf4Q/NH5Cp6in7y/Ns8C9tN24Q1b1FB0giR6HSE17WjWWiPWUca GDCQozRUb2lPWlAlveqvtHknVVr9XDh5tQQaJ5OkLqn/tduYIQTx2T5Vp87sbQlxmmz2qYZONm HF+5poY5dU735HtDCZ3r90RzeVH/RmWZC6pZTsDqajfQCZB8W6Ixj2hzIxCAFBaHwhZC/snZ9R pB4GoPjucD2POPB6F8lExvcdnj/6OU/qDmkksrohJjzNi50URV5k53zzXzyNOx1uEWF/77XHyr UmMynNyKbE29DUAR3/CyyJMW+qEzygxhygou3qUEDnwBeQ==; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=zsh.org; s=rsa-20200801; h=List-Archive:List-Owner:List-Post:List-Unsubscribe: List-Subscribe:List-Help:List-Id:Sender:Content-Type:Cc:To:Subject:Message-ID :Date:From:In-Reply-To:References:MIME-Version:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID; bh=WvS0B+lsUGOG6onPLo/jdA+PH/ChzICzdOH1dkLZLMU=; b=uS+nczSqxYhkK9ZIB5Guyf1swu KujeB6ZIy00C7a/13x3AsjhcnMsNjuQz9pGsm2yAAX9B1ywYKhkTijVICc5jjpArx13+i1nEJ2SJZ YTYu7FgwZXPgiv3ERQEew0LvMYHAezoUmIQB8MI/fd1HXgLyri8PsWmWzzNFJYlNZBwGL6NcZhG48 ojxoVYSe5nwtULU8VwgQ5Mue3lPSZizLPV9/rL/DCa7wD/BdlV8YWN+OYrwYC1wsB7JYDi6eJaJu/ iDeut1OVeC/YAnDNyPCR5D9m/nX5Sc1QwVq0S/bqVdNW4z8WqA5rtHjzVHtXTb06uKdIF80giJel9 zm0B2vRQ==; Received: from authenticated user by zero.zsh.org with local id 1kxdnJ-000Jnj-SW; Thu, 07 Jan 2021 22:30:14 +0000 Authentication-Results: zsh.org; iprev=pass (mail-oi1-f179.google.com) smtp.remote-ip=209.85.167.179; dkim=pass header.d=brasslantern-com.20150623.gappssmtp.com header.s=20150623 header.a=rsa-sha256; dmarc=none header.from=brasslantern.com; arc=none Received: from mail-oi1-f179.google.com ([209.85.167.179]:43670) by zero.zsh.org with esmtps (TLS1.3:TLS_AES_128_GCM_SHA256:128) id 1kxdmx-000JdM-QQ; Thu, 07 Jan 2021 22:29:53 +0000 Received: by mail-oi1-f179.google.com with SMTP id q25so9172445oij.10 for ; Thu, 07 Jan 2021 14:29:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brasslantern-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=WvS0B+lsUGOG6onPLo/jdA+PH/ChzICzdOH1dkLZLMU=; b=oMU6qeeYhCsSv8ZQsY3goyVfR8VXgDxkdE9tXxk0taWKOApZ8mQxYYqDp5Lc9DRxPL HRKyLx8ijfUyrCf+B0hOTRZaOFjZoQf2sswdoRiaIbPXNlqSsyqCtQQ7n2GW4thJv/o5 00ILtvegY7jVPUFct/jOZSARm+TCxf4wgk160UPPmuR0ePHwVw5/qYpQbijj+lRtnILb HK/C6r3K64P1hLgbGxQIHB8bB1UGIMXJWB1PHtK7i7WMMg9uJ1lDqzNToFeFh4PymiuY MKibpb1BC65k0/pgcuNIR+ENRtH70wcWVwgQVEwz1LOuhfUlB4X4QTfi5SLnnY1kcG8T siqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=WvS0B+lsUGOG6onPLo/jdA+PH/ChzICzdOH1dkLZLMU=; b=eR7vidl6wsbcJEx6G4xfnNCKiguM8e6rdPF1vQtpR3VrYcQ1uT6k4K7m2Yr6ayszEU wP0NvcqJa5pDAEB3arlTwN1gcNHWSIUrAGNTKj9QEJpT2xTzwPHimzTPXxfsvei/wCQT qGBmb/B41c/n4PtKlUnErndhOtXL5ykDwOLGae7pCTqNqHPyoWBUPQS5Hvvg3hNsT1tj 2+DixE5CNBWj/37B8k5I5p02X696arIfvsWQMJCr4DxOmSo0dgCuf4o9Qb7m3RZAVRdQ yeljkTIky4HY9gYGM841f6bpYelQTTgij3x8MFnF7YFWBMWHDh+UNVSUxpV/MM8SyAs1 hdfA== X-Gm-Message-State: AOAM532fAnnt8BeiVub71UDuVnOjv2kY64u63bxCPO9pFJl79V3TUbzi lVbevv8N1mHMQ+URwkYrcCzTvp3iB+3OmitBprQr2f4YAAxzTA== X-Google-Smtp-Source: ABdhPJwR5czeqgEXV/j8iGFxNQA0UKb4m8FMpJFVzLuvf1LuMrcXUyJrkVPobMBMp5ql0K6HodkgwKzlcRMMFW4hdJU= X-Received: by 2002:aca:6089:: with SMTP id u131mr516855oib.84.1610058590041; Thu, 07 Jan 2021 14:29:50 -0800 (PST) MIME-Version: 1.0 References: <20201228221342.136199-1-felipe.contreras@gmail.com> <20210104061718.GB14783@tarpaulin.shahaf.local2> <4e9d7283-94fa-4862-ab04-8c3294f3876c@www.fastmail.com> <20210107154818.GB25249@tarpaulin.shahaf.local2> In-Reply-To: <20210107154818.GB25249@tarpaulin.shahaf.local2> From: Bart Schaefer Date: Thu, 7 Jan 2021 14:29:38 -0800 Message-ID: Subject: Re: [PATCH] declarednull: rename DECLARED to NULL To: Daniel Shahaf Cc: "zsh-workers@zsh.org" Content-Type: multipart/alternative; boundary="00000000000053ca5e05b856faa6" X-Seq: 47809 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: Archived-At: --00000000000053ca5e05b856faa6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, Jan 7, 2021 at 7:48 AM Daniel Shahaf wrote= : > > > > 1) the bit representing "remember that this was declared but no val= ue > > > > was assigned" > > > > 2) the combination of that with PM_UNSET that represents > "functionally > > > > behaves like NULL" > > After =C2=ABunset=C2=BB, PM_UNSET would be set, and I don't immediately s= ee why > bit #1 > should be tested at all if if PM_UNSET is set. Bit #1 is tested for "typeset -p var". If PM_UNSET is set and bit #1 is not, then "typeset -p" outputs nothing; but we want typeset -p to output a declaration (with no assignment). > If the =C2=ABunset=C2=BB is followed by > an assignment and/or (re-)declaration, the value of bit #1 can then be se= t > properly, and PM_UNSET cleared. Makes sense? > Bit #1 has to be cleared on explicit unset, and is irrelevant on assignment because PM_UNSET is cleared on assignment. However, it's most convenient to clear bit #1 on assignment because that eliminates one special case on "typeset var=3Dvalue" (as opposed to "typeset var"). --00000000000053ca5e05b856faa6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Thu, Jan 7, 2021 at 7:48 AM Daniel Sha= haf <d.s@daniel.shahaf.name> wrote:
> > > 1) the bit representing "rememb= er that this was declared but no value
> > > was assigned"
> > > 2) the combination of that with PM_UNSET that represents &qu= ot;functionally
> > > behaves like NULL"

After =C2=ABunset=C2=BB, PM_UNSET would be set, and I don't immediately= see why bit=C2=A0#1
should be tested at all if if PM_UNSET is set.

<= div>Bit #1 is tested for "typeset -p var".=C2=A0 If PM_UNSET is s= et and bit #1 is not, then "typeset -p" outputs nothing; but we w= ant typeset -p to output a declaration (with no assignment).
If the =C2=AB= unset=C2=BB is followed by
an assignment and/or (re-)declaration, the value of bit=C2=A0#1 can then be= set
properly, and PM_UNSET cleared.=C2=A0 Makes sense?
--00000000000053ca5e05b856faa6--