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

From: Clément Pit-Claudel
Subject: Re: "Like `let*' but ....."
Date: Tue, 24 Jan 2017 16:26:55 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

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!


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