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pub trait DacExt {
    fn constrain(self) -> Dac;
}

impl DacExt for Dac {
    fn constrain(self) -> Dac {
        Dac {}
    }
}

pub struct Dac {}

// IMPLEMENT PERIPHERAL AFTER THIS LINE

#[cfg(test)]
mod tests {

    #[test]
    fn nothing() {
        // Do nothing test
    }
}