Re: [PATCH v2 03/16] rust: io: support register projections

> `IoLoc`s themselves just describe a projection from a region to a concrete
> register. Thus, support it in `io_project` macro too. Also, update methods
> that operate on `IoLoc` to use I/O projection.
> 
> Documentation of `io_project!` is not expanded yet as the example works
> better when `register!` type can specify base type. `io_read!` and
> `io_write!` gains the ability to operate on registers as corollary of the
> capability of `io_project!`. Examples are not added because `read` and
> `write` is still preferrably used instead.
> 
> Signed-off-by: Gary Guo <[email protected]>

Sashiko has reviewed this patch and found no issues. It looks great!

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