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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <150725115419.ZM2876@torch.brasslantern.com>
Date: Sat, 25 Jul 2015 11:54:19 -0700
In-Reply-To: <20150725170340.GY2433@sym.noone.org>
Comments: In reply to Axel Beckert <abe@deuxchevaux.org>
        "Fwd: [Pkg-zsh-devel] Bug#793168: zsh: expand-substitution-on-TAB broke for $(()) in 5.0.8 [origin: adi@hexapodia.org]" (Jul 25,  7:03pm)
References: <20150725170340.GY2433@sym.noone.org>
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To: zsh-workers@zsh.org
Subject: Re: Fwd: [Pkg-zsh-devel] Bug#793168: zsh: expand-substitution-on-TAB broke for $(()) in 5.0.8 [origin: adi@hexapodia.org]
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On Jul 25,  7:03pm, Axel Beckert wrote:
}
} I can also reproduce this issue with zsh 5.0.8 in Debian and can
} confirm, that it didn't happen with zsh 5.0.7 in Debian.
} 
} ----- Forwarded message from Andy Isaacson <adi@hexapodia.org> -----
} 
} with zsh 5.0.7 and earlier versions, if I type $((5*8)) and then hit TAB,
} the expression is replaced with its evaluation ("40" in this case).

This appears to be a difference in behavior of the expand-or-complete
built-in widget.  With _expand added to the completer zstyle or with
the expand-word widget, the behavior is unchanged.

There's no change to the widget itself.  The issue seems to be that
the completion system is examining $((5*8) [without the trailing paren] 
insead of the full expression.  You can see this in action if you
"setopt completealiases"; using "_" to represent the position of the
cursor:

torch% setopt completealiases
torch% echo $((5*8))_<TAB>
[... list of parameter names appears ...]
torch% echo $((5*8)_)

This must in turn be due to the change in the parser to disambiguate
"$((" as either math or command substitution; completion is trying it
as command substitution without looking ahead to see if it can be done
as math instead.