*X-seq*: zsh-workers 29288*From*: Mikael Magnusson <mikachu@xxxxxxxxx>*To*: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>*Subject*: Re: Infinite recursions in math evaluation*Date*: Sat, 14 May 2011 20:09:16 +0200*Cc*: zsh workers <zsh-workers@xxxxxxx>*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=olh4hs1Egeoo8F14nsnIn6OuMQjv3LOOAX1k1+9p4Pg=; b=aT4fCcaNFlbrK5Uf7zyHWsNUNVsgPvMyST+HGuuNoJQYor+UpUZXC48rWSa8flyGHS pieyiDlr8VA7kE1TAwoHhIt293aMOXnk4pwYIOpk22iTjnIH7G5mRv/RANovEfW/bHwv +PF70wzUVrjIFpaJRCsD/cUlCtPelKk9lllXg=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=R99JTn+mfip8Uu12Ldpp6oDKCSHOI2rA5HzwWP8vLMmqrb84/MC/GxvGdlyKQ/vdoV siLZRs3NsPt/vLP5/hY7+f4OCPflI4IfbRW67pnDKF5E0OtOdrNmV48Ibt2axZgRNVl3 18IwPfGrnWaOsoHRmFVFeTp8lOgipeWD+AHUQ=*In-reply-to*: <110514110040.ZM14542@torch.brasslantern.com>*List-help*: <mailto:zsh-workers-help@zsh.org>*List-id*: Zsh Workers List <zsh-workers.zsh.org>*List-post*: <mailto:zsh-workers@zsh.org>*Mailing-list*: contact zsh-workers-help@xxxxxxx; run by ezmlm*References*: <BANLkTimXmy78=PFk_5Hm0j+4owt0Fb=BNg@mail.gmail.com> <110513213633.ZM13611@torch.brasslantern.com> <BANLkTi=bMHd4RRAj5TannqbVkqjz=y3iUQ@mail.gmail.com> <110514110040.ZM14542@torch.brasslantern.com>

On 14 May 2011 20:00, Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx> wrote: > On May 14, 11:03am, Mikael Magnusson wrote: > } > } > "The value of $val1" in an arithmetic context is the result of doing > } > arithmetic evaluation on whatever is stored in the parameter. If > } > that's the name of another (or even the same) parameter, then ... > } > } How did you get this from the quoted part? > > I did say it was implicit. :-) > > At each nested level of substitution, the substituted words > undergo all forms of single-word substitution (i.e. not filename > generation), including command substitution, arithmetic expansion > and filename expansion > > In ((var)), "var" is a nested arithmetic expansion. Inside the value > of var, any mention of another bare parameter name is thus also a > nested arithmetic expansion. I can't see how this follows from the above. That whole section is talking about multiple nested ${...} forms specifically, not nested arithmetic expansions. I rather read the arithmetic expansion there to mean that if you write ${$((5 + 3))} it will work, which it does. It doesn't really say anything about what happens in arithmetic expansion itself (does it?). -- Mikael Magnusson

**References**:**Infinite recursions in math evaluation***From:*Mikael Magnusson

**Re: Infinite recursions in math evaluation***From:*Bart Schaefer

**Re: Infinite recursions in math evaluation***From:*Mikael Magnusson

**Re: Infinite recursions in math evaluation***From:*Bart Schaefer

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