Implement a newtype that wraps an existing type and implements a public trait

wrap_inner_trait.rs

pub struct ToggleThing<T> {
    inner: T
}

impl<T> StatefulOutputPin for ToggleThing<T>
    where T: StatefulOutputPin + OutputPin
{
    fn is_set_high(&self) -> Result<bool, Self::Error> {
        self.inner.is_set_high()
    }

    fn is_set_low(&self) -> Result<bool, Self::Error> {
        self.inner.is_set_low()
    }
}

impl<T> OutputPin for ToggleThing<T>
    where T: StatefulOutputPin + OutputPin
{
    type Error = T::Error;

    fn set_low(&mut self) -> Result<(), Self::Error> {
        self.inner.set_low()
    }

    fn set_high(&mut self) -> Result<(), Self::Error> {
        self.inner.set_high()
    }
}

impl<T> toggleable::Default for ToggleThing<T>
where T: StatefulOutputPin + OutputPin
{ }