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Re: The poor state of documentation of pcase like things.
From: |
Michael Heerdegen |
Subject: |
Re: The poor state of documentation of pcase like things. |
Date: |
Sat, 19 Dec 2015 16:14:15 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
address@hidden (Phillip Lord) writes:
> (pcase '(3 1 2)
> (`(_ 1 2)
> (message "Matched a list of anything followed by (2 3)")))
>
> prints nothing.
>
> while this...
>
> (pcase '(3 1 2)
> (`(,_ 1 2)
> (message "Matched a list of anything followed by (2 3)")))
>
> prints the message (which should be "followed by (2 3)").
>
> I am a bit surprised to find that _ needs , in these examples, and I
> think that it's a bug.
I think it's intentional, and it fits the documentation.
We think of elements in a backquoted list to be all quoted unless
explicitly unquoted. It makes no sense that '_ matches any expression.
It matches only the symbol _, and that can be useful, too.
Michael.
- Re: The poor state of documentation of pcase like things., (continued)
- Re: The poor state of documentation of pcase like things., Marcin Borkowski, 2015/12/18
- Re: The poor state of documentation of pcase like things., John Wiegley, 2015/12/22
- Re: The poor state of documentation of pcase like things., Alan Mackenzie, 2015/12/17
- Re: The poor state of documentation of pcase like things., John Wiegley, 2015/12/17
- Re: The poor state of documentation of pcase like things., Eli Zaretskii, 2015/12/18
- Re: The poor state of documentation of pcase like things., Michael Heerdegen, 2015/12/19
- Re: The poor state of documentation of pcase like things., John Wiegley, 2015/12/22
Re: The poor state of documentation of pcase like things., John Wiegley, 2015/12/17
- Re: The poor state of documentation of pcase like things., Richard Stallman, 2015/12/17
- Re: The poor state of documentation of pcase like things., Phillip Lord, 2015/12/18
- Re: The poor state of documentation of pcase like things.,
Michael Heerdegen <=
- Re: The poor state of documentation of pcase like things., Phillip Lord, 2015/12/19
- Re: The poor state of documentation of pcase like things., Michael Heerdegen, 2015/12/19
- Re: The poor state of documentation of pcase like things., Phillip Lord, 2015/12/19
- Re: The poor state of documentation of pcase like things., Richard Stallman, 2015/12/20
- RE: The poor state of documentation of pcase like things., Phillip Lord, 2015/12/20
- Re: The poor state of documentation of pcase like things., Richard Stallman, 2015/12/21
- Re: The poor state of documentation of pcase like things., Phillip Lord, 2015/12/21
- Re: The poor state of documentation of pcase like things., John Wiegley, 2015/12/22
Re: The poor state of documentation of pcase like things., Michael Heerdegen, 2015/12/20
Re: The poor state of documentation of pcase like things., Michael Heerdegen, 2015/12/20