RE: pcase-if-let?

[Drew Adams]

> I call it `if-matching' for now (like in "if [given clauses are]
> matching [do this else that]").

IIUC (?), what distinguishes this from other pcase* stuff
is that this one is about matching ALL of a set of clauses.
It's not that this one is about matching and the others
are not.  (And this one is a form of "if".)

That's why I suggested something like:

  `if-all-match' (or even just `if-all')

Am I wrong that what is important here are "if" and "all",
not "matching"?