[bsder]

> The idea of checking that a pin is "only used in one place" doesn't really jive with how I think about microcontroller programming.

I'm with you, but ...

I find that most SDKs invariably grow a C macro system for "Configure this pin/register/whatever and yell if somebody tries to reconfigure it".

The fact that Rust is baking this in up front is not unwarranted.