New EEP draft: Pinning operator ^ in patterns

Loïc Hoguin essen@REDACTED
Fri Dec 25 16:57:56 CET 2020

I get the feeling, occasionally you move code around and variables end 
up having the same name and things break. But it's so rare that 1- you 
forgot to check variable names and this happens; and 2- tests don't 
catch the mistake; and 3- code review doesn't notice the problem, that I 
don't think I would end up using this.

Merry Christmas!

On 24/12/2020 21:10, Richard Carlsson wrote:
> The ^ operator allows you to annotate already-bound pattern variables as 
> ^X, like in Elixir. This is less error prone when code is being 
> refactored and moved around so that variables previously new in a 
> pattern may become bound, or vice versa, and makes it easier for the 
> reader to see the intent of the code.
> See also
> Ho ho ho,
>          /Richard & the good folks at WhatsApp

Loïc Hoguin

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