If you are writing a basic fn main() -> ! in Rust, there are two pitfalls using the rp-hal as it is:

1. You don't get any useful methods on your GPIO pins unless you import the right embedded-hal traits
2. The embedded-hal traits insist the methods (like fn set_high()) return a Result<(), Self::Error> even though on RP2040 setting a pin high cannot fail. We set type Error = core::convert:Infallible but this still has to be handled with .unwrap() or let _ = , otherwise you get a warning.

We should implement inherent methods on the type called set_high() and set_low() which return nothing. We can defer to these methods in the implementation of the embedded-hal methods, and then only people using the traits (i.e. driver authors) have to worry about the return type.