Warn on 2 ^ n - author usually intends 2 ** n

[Zac-HD]

It's pretty rare for people to actually intend to do bitwise-or with constants; making this a lint error when the "base" is either 2 or 10 would likely save quite a few people some frustrating debugging (or silent errors)

[MichaReiser]

Thanks for opening this rule proposal.

I think we have to wait before #1774 is complete to add this rule because it is a "restriction" lint and somewhat opinionated.