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pub trait PortExt {
    fn constrain(self) -> Port;
}

impl PortExt for Port {
    fn constrain(self) -> Port {
        Port {}
    }
}

pub struct Port {}

// IMPLEMENT PERIPHERAL AFTER THIS LINE

#[cfg(test)]
mod tests {

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