From: Alan Mackenzie <acm@muc.de>
To: "Clément Pit-Claudel" <cpitclaudel@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: "Like `let*' but ....."
Date: Fri, 27 Jan 2017 20:33:17 +0000 [thread overview]
Message-ID: <20170127203317.GB2630@acm> (raw)
In-Reply-To: <8689586f-16fa-058e-6e9e-30e74b289593@gmail.com>
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).
next prev parent reply other threads:[~2017-01-27 20:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-24 21:12 "Like `let*' but ....." Alan Mackenzie
2017-01-24 21:26 ` Clément Pit-Claudel
2017-01-27 20:33 ` Alan Mackenzie [this message]
2017-01-24 23:10 ` Michael Heerdegen
2017-01-25 5:08 ` Stefan Monnier
2017-01-27 20:31 ` Alan Mackenzie
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