Re: [PATCH v9 12/27] rust: add `kernel` crate

[comex]

> On Sep 20, 2022, at 6:39 PM, Gary Guo <gary@xxxxxxxxxxx> wrote:
> 
> It should be noted however, atomic context is not something that a
> token can represent. You can only use tokens to restrict what you *can*
> do, but not what you *can't* do. There is no negative reasoning with
> tokens, you can't create a function that can only be called when you
> don't have token.

On the other hand, it ought to be feasible to implement that kind of ’negative reasoning' as a custom lint.  It might not work as well as something built into the language, but it should work decently well, and could serve as a prototype for a future built-in feature.