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bug#31311: 27.0; doc of `pcase'

From: Drew Adams
Subject: bug#31311: 27.0; doc of `pcase'
Date: Sun, 29 Apr 2018 16:28:14 -0700 (PDT)

> > 2. CODE is undefined (not specified).  We say only this:
> >
> >  "The CODE expression corresponding to the matching
> >   pattern determines the return value."
> I guess you missed the second line of the docstring?
>     CASES is a list of elements of the form (PATTERN CODE...).

No, not at all.  That's where CODE is "bound" in the
description, but not where it is defined.  I'm looking
for a description of CODE.

The most one can say, apparently, is that CODE is an
expression.  What purpose the sequence of CODE expressions
serves - what is done with them (or with any of them) -
isn't clear.

It talks about "the CODE expression corresponding to
the matching pattern".  Which CODE expression of the
sequence "CODE..." is "_the_ CODE expression"?  What
does it mean for "the CODE expression" to _correspond_
to the matching pattern?  (That should presumably be
"the matching PATTERN, BTW.)

Sorry, but it's just not clear.

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