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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <150302005440.ZM16546@torch.brasslantern.com>
Date: Mon, 2 Mar 2015 00:54:40 -0800
In-Reply-To: <20150302022754.GA7449@xvii.vinc17.org>
Comments: In reply to Vincent Lefevre <vincent@vinc17.net>
        "Re: grammar triviality with '&&'" (Mar  2,  3:27am)
References: <54F33934.2070607@eastlink.ca>  <13666281425228233@web7o.yandex.ru> 
	<54F345D3.9010204@eastlink.ca> 
	<D0509295-7DA9-4F18-9E3D-D50C0A756998@larryv.me> 
	<20150302022754.GA7449@xvii.vinc17.org>
X-Mailer: OpenZMail Classic (0.9.2 24April2005)
To: zsh-users@zsh.org
Subject: Re: grammar triviality with '&&'
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On Mar 2,  3:27am, Vincent Lefevre wrote:
}
} However "&& [ -e file2 ]" could constitute a list too. There is
} currently a parse error, but zsh could have an extension to accept
} it as being equivalent to: "[[ $? -eq 0 ]] && [ -e file2 ]". Would
} there be anything wrong with such an extension?

If nothing else, the errexit option would fail.  With errexit,

    false
    || anything

would never get beyond "false", whereas

    false || anything

proceeds at least through "anything".

You also get strange crap like

    while && this; do || if && that; then || thus; fi; done

which would mean what, exactly?

Finally if it's OK to have nothing before && / ||, then it would also be
syntactically OK to write

    && || && || && && ...

No.