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Re: (format "Hello %1$S%2$s" 'world "!")

From: Clément Pit-Claudel
Subject: Re: (format "Hello %1$S%2$s" 'world "!")
Date: Sun, 2 Jul 2017 12:32:41 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1

On 2017-07-02 11:03, Noam Postavsky wrote:
> I don't recall anyone suggesting that. 

Sorry, I should have, then :/

> Why would we need a new function since %n$ would be an error for the old 
> format anyway?

This in itself is a good reason to have a new function.  A new function lets 
you migrate existing code, including plugins, to the new syntax, and load the 
polyfill in older Emacsen.  A new syntax that causes errors in old Emacsen 
isn't usable by anyone outside of Emacs core, for fear of compatibility 

Also, the syntax is very heavy.  Was it inspired by another programming 
language?  The ones I'm familiar with use $1, {1}, or similar syntax, but I've 
never seen %1$s :/

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