From fffcd7766285133b88433706ed32bb9b1dee781c Mon Sep 17 00:00:00 2001
From: Todd Gamblin <tgamblin@llnl.gov>
Date: Mon, 13 Nov 2017 00:22:59 -0700
Subject: [PATCH] Allow types and 'any' in variant definitions. (#4524)

- Previously variant values had to be a tuple or a callable predicate.

- This allows 'any' as shorthand for `lambda x: True` and type objects
  as shorthand for "any value of this type".

- Makes variant definitions more readable, keeps lambdas out of
  packages for common cases.