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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <150415081348.ZM26219@torch.brasslantern.com>
Date: Wed, 15 Apr 2015 08:13:48 -0700
In-Reply-To: <20150415100324.296ffa3e@pwslap01u.europe.root.pri>
Comments: In reply to Peter Stephenson <p.stephenson@samsung.com>
        "Re: broken parsing with $((`:`))" (Apr 15, 10:03am)
References: <20150415030531.GA8187@vapier> 
	<20150415100324.296ffa3e@pwslap01u.europe.root.pri>
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Subject: Re: broken parsing with $((`:`))
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On Apr 15, 10:03am, Peter Stephenson wrote:
} 
} Yes, indeed --- there's a funny internal special case for empty strings
} that I never quite get my head around.
} 
} -    if (!*s) {
} +    if (!*s || *s == Nularg) {

I wonder if (a) there are other overlooked cases like this and (b) if it
would be useful to have a #define macro for (c == '\0' || c == Nularg).
A quick grep doesn't find existing cases of that test other than this
new one, but of course if the Nularg part were forgotten, it wouldn't.

I suspect it just isn't that common because Nularg goes away after the
parsing pass.

} (Please, God, make the problems with command and math substitution
} parsing stop now.)

Indeed ... at what point should we consider 5.0.8 to get all these little
edge-case fixes out into the field?