pub trait Sub<Rhs = Self> {
    type Output;
    // Required method
    fn sub(self, rhs: Rhs) -> Self::Output;
}Expand description
The subtraction operator -.
Note that Rhs is Self by default, but this is not mandatory. For
example, std::time::SystemTime implements Sub<Duration>, which permits
operations of the form SystemTime = SystemTime - Duration.
§Examples
§Subtractable points
use std::ops::Sub;
#[derive(Debug, Copy, Clone, PartialEq)]
struct Point {
    x: i32,
    y: i32,
}
impl Sub for Point {
    type Output = Self;
    fn sub(self, other: Self) -> Self::Output {
        Self {
            x: self.x - other.x,
            y: self.y - other.y,
        }
    }
}
assert_eq!(Point { x: 3, y: 3 } - Point { x: 2, y: 3 },
           Point { x: 1, y: 0 });§Implementing Sub with generics
Here is an example of the same Point struct implementing the Sub trait
using generics.
use std::ops::Sub;
#[derive(Debug, PartialEq)]
struct Point<T> {
    x: T,
    y: T,
}
// Notice that the implementation uses the associated type `Output`.
impl<T: Sub<Output = T>> Sub for Point<T> {
    type Output = Self;
    fn sub(self, other: Self) -> Self::Output {
        Point {
            x: self.x - other.x,
            y: self.y - other.y,
        }
    }
}
assert_eq!(Point { x: 2, y: 3 } - Point { x: 1, y: 0 },
           Point { x: 1, y: 3 });