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Bill Allombert on Thu, 12 Sep 2024 19:53:35 +0200
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- To: pari-dev@pari.math.u-bordeaux.fr
- Subject: Re: Supporting 2u
- From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
- Date: Thu, 12 Sep 2024 19:53:31 +0200
- Delivery-date: Thu, 12 Sep 2024 19:53:35 +0200
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- In-reply-to: <20240912144328.GC2099@cventin.lip.ens-lyon.fr>
- Mail-followup-to: pari-dev@pari.math.u-bordeaux.fr
- References: <ZrmwRjKBBrZFqTOx@debian.attlocal.net> <02b2f4ec-8b69-4dce-b511-f4fb1ae758fd@isolution.nl> <20240812104846.GH3071@qaa.vinc17.org> <ZuL36V7UjpqHXs5F@debian.attlocal.net> <20240912144328.GC2099@cventin.lip.ens-lyon.fr>
On Thu, Sep 12, 2024 at 04:43:28PM +0200, Vincent Lefevre wrote:
> On 2024-09-12 07:17:13 -0700, Ilya Zakharevich wrote:
> > On Mon, Aug 12, 2024 at 12:48:46PM +0200, Vincent Lefevre wrote:
> > > On 2024-08-12 12:04:36 +0200, Ruud H.G. van Tol wrote:
> > > > > P.S. IMO, 2u should better be parsed (as expected by the user!).
> > > >
> > > > Rather not. For example, 2e1 is already syntax, so can't also mean 2*e1.
> >
> > This does not stop other ambiguous syntaxes — like ++.
>
> AFAIK, it isn't ambiguous in GP/PARI, where "++" always means
> the increment postfix operator, even with a space:
>
> ? x+ +
> %1 = x + 1
>
> (I'm wondering whether this is a bug.)
It is not a bug: all spaces are removed before tokenization.
Cheers,
Bill.