pub trait CheckedSub<Rhs = Self> {
type Output;
// Required method
fn checked_sub(self, other: Rhs) -> Option<Self::Output>
where Self: Sized;
}pub trait CheckedSub<Rhs = Self> {
type Output;
// Required method
fn checked_sub(self, other: Rhs) -> Option<Self::Output>
where Self: Sized;
}