Re: pcase bindings in patterns with complicated logic

[Stefan Monnier]

> I looked up the use of pcase's `app' pattern across the packages I use
> and inside Emacs source code. There are only several trivial uses,
> actually:

The `app` pattern is mostly for internal use when defining other
patterns.  It's key to the implementation of patterns like backquote so
it's very important, but you'll rarely see it "out and about" in
a `pcase` or `pcase-let` statement.


        Stefan