Stefan Monnier writes:

>>     New macro seq-let, providing destructuring support to seq.el
>
> How 'bout adding support for `seq' to pcase instead?
> I.e. add a (seq ...) pattern to pcase.
> You can do that with `pcase-defmacro'.

I pushed in commit 387e1e1 another version that is based on pcase.

As old versions of Emacs don't provide `pcase-defmacro', I kept the old
version of seq-let for backward compatibility.

Stefan, could you review my changes, I'm quite new with pcase.

Nico
-- 
Nicolas Petton
http://nicolas-petton.fr