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Re: The poor state of documentation of pcase like things.

From: Richard Stallman
Subject: Re: The poor state of documentation of pcase like things.
Date: Thu, 17 Dec 2015 23:07:53 -0500

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  > There are many special UPatterns, and their variety makes this the hardest
  > aspect to master. Let's consider them one by one.

  > ## Underscore `_'

  > To match against anything whatsoever, no matter its type or value, use
  > underscore. Thus to match against a list containing anything at all at its
  > head, we'd use:

  >     (pcase value
  >       (`(_ 1 2)
  >        (message "Matched a list of anything followed by (2 3)")))

I don't follow this part.  (_ 1 2) seems to be a QPattern.
Is that right?  So how is it that an element can be a UPattern?

It would help if some of the examples used symbols inside a QPattern,
without comma, so we can see what that does.

Dr Richard Stallman
President, Free Software Foundation (gnu.org, fsf.org)
Internet Hall-of-Famer (internethalloffame.org)
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