Re: master ea93326: Add `union' and `intersection' to rx (bug#37849)

[Mattias Engdegård]

11 dec. 2019 kl. 16.10 skrev Stefan Monnier <address@hidden>:

> But as a user now I wonder what's the difference between `or` and
> `union` and also why there has to be a difference.

You've convinced me -- plain 'or' is better. I've pushed a patch.

As a pleasing side-effect, some existing rx expressions are now more optimised:
(or (any "a-z") (any "0-9")) now becomes "[0-9a-z]" instead of "[a-z]\\|[0-9]".

The no-class argument restriction is still there, but could perhaps be lifted 
(partially) later on.