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Thus, support it in `io_project` macro too. Also, update method= s > 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 Reviewed-by: Alexandre Courbot