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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <150602105822.ZM4076@torch.brasslantern.com>
Date: Tue, 2 Jun 2015 10:58:22 -0700
In-Reply-To: <556C890E.80506@inlv.org>
Comments: In reply to Martijn Dekker <martijn@inlv.org>
        "Arith expansion accepts extra closing parenthesis" (Jun  1,  6:32pm)
References: <556C890E.80506@inlv.org>
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To: zsh-workers@zsh.org
Subject: Re: Arith expansion accepts extra closing parenthesis
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On Jun 1,  6:32pm, Martijn Dekker wrote:
} Subject: Arith expansion accepts extra closing parenthesis
}
} I just found some more arithmetic parsing strangeness. zsh 5.0.8 and
} 4.3.11 both happily accept and ignore one (1) extra closing parenthesis
} 
} % X='1)'
} % echo $((X))
} 1

Easier way to see this:

% let "1)"
%

It appears mathparse() around lines 1566-1568 of math.c consumes one
token of lookahead with zzlex() and inadvertently discards it when it
turns out to be a close-paren.  This is partly because of the pseuedo-
precedence assigned to M_OUTPAR "for convenience".

I'm not sure what the correct fix is; maybe checkunary() should throw
an error on M_OUTPAR?