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Re: "Like `let*' but ....."

From: Alan Mackenzie
Subject: Re: "Like `let*' but ....."
Date: Fri, 27 Jan 2017 20:33:17 +0000
User-agent: Mutt/1.7.2 (2016-11-26)

Hello, Clément.

On Tue, Jan 24, 2017 at 16:26:55 -0500, Clément Pit-Claudel wrote:
> On 2017-01-24 16:12, Alan Mackenzie wrote:
> > What is not clear is precisely HOW `pcase' patterns are used for
> > bindings, and what the semantics of (PAT EXP) are.

> Hi Alan,

> I find that mentally translating (pcase-let* ((<x> <y>)) <z>) to
> (pcase <y> (<x> <z>)) helps.  This translation is mostly correct, with
> the added twist that the former is undefined if <y> doesn't match <x>.

> Then everything is as in the pcase documentation. Hopefully this helps!

Yes, it does, I think.  Thanks!

> Cheers,
> Clément.

Alan Mackenzie (Nuremberg, Germany).

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