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pub trait HrpwmExt { fn constrain(self) -> Hrpwm; } impl HrpwmExt for Hrpwm { fn constrain(self) -> Hrpwm { Hrpwm {} } } pub struct Hrpwm {} // IMPLEMENT PERIPHERAL AFTER THIS LINE #[cfg(test)] mod tests { #[test] fn nothing() { // Do nothing test } }