Feature request: bitwise ops or expression syntax for set operations

[toddlipcon]

Often times it's convenient to have a set of flags stored as a single variable (particularly when modeling legacy code). It would be great to support bitwise ops like &, |, ^, ~, etc, for arithmetic, to make this simpler.

Alternatively, one could use set[tMyFlagEnum], but that's also somewhat inconvenient today -- as far as I can tell there is no syntax for a literal set. It would be nice to be able to do:

var s : set[int];
s = {1,2,3};

(or if these features exist, they don't seem to be documented)