Hmm... I've been using &refs for the enums. Not the same as shared resource, but has semantic similarities:
```rust
impl StatusLed {
    fn port_pin(&self) -> (Port, u8) {
        match self {
            Self::Fix => (Port::C, 13),
            Self::RxMode => (Port::C, 14),
        }
    }

    pub fn turn_on(&self) {
        let (port, pin) = self.port_pin();
        gpio::set_high(port, pin);
    }
    pub fn turn_off(&self) {
        let (port, pin) = self.port_pin();
        gpio::set_low(port, pin);
    }
}

```