From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: help-gnu-emacs@gnu.org
Subject: Re: Quick pcase question
Date: Thu, 03 Mar 2016 09:08:25 +0800 [thread overview]
Message-ID: <87mvqg4bcm.fsf@ericabrahamsen.net> (raw)
In-Reply-To: 878u20vlwg.fsf@russet.org.uk
phillip.lord@russet.org.uk (Phillip Lord) writes:
> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>
>> Michael Heerdegen <michael_heerdegen@web.de> writes:
>>
>>> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>>>
>>>> (pcase tst
>>>> (`(symbolla . ,(and x (pred stringp)))
>>>> (message "cdr is a string: %s" x)))
>>>>
>>>> Is the ",(and x (pred stringp))" part really the simplest way of doing
>>>> that?
>>>
>>> Yes, I think so.
>>>
>>> How could it be much simpler (there is not much redundancy in that
>>> expression)?
>>
>> It's not so much the simplicity, I guess, as the intuitiveness -- "(and x"
>> looks like a test to me, not an assignment. My brain would prefer:
>>
>> (,x (pred stringp))
>
> What about?
>
> (guard (stringp ,x))
You're suggesting that as a possible alternate syntax, right? (In which
case I like it.) It doesn't actually work now, does it?
next prev parent reply other threads:[~2016-03-03 1:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-02 10:12 Quick pcase question Eric Abrahamsen
2016-03-02 11:02 ` Michael Heerdegen
2016-03-02 11:18 ` Eric Abrahamsen
2016-03-02 11:38 ` Michael Heerdegen
2016-03-02 11:56 ` Eric Abrahamsen
2016-03-02 12:27 ` Michael Heerdegen
2016-03-02 17:25 ` Phillip Lord
2016-03-03 1:13 ` Eric Abrahamsen
2016-03-03 3:47 ` Stefan Monnier
2016-03-02 17:18 ` Phillip Lord
2016-03-03 1:08 ` Eric Abrahamsen [this message]
2016-03-03 12:08 ` Phillip Lord
2016-03-02 12:40 ` Phillip Lord
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