failing compile

main.rs

#[derive(Debug)]
struct Point {
    x: f64,
    y: f64,
}

impl std::ops::Add for Point {
    type Output = Point;
    fn add(self, rhs: Point) -> Point {
        Point::new(self.x + rhs.x, self.y + rhs.y)
    }
}

impl std::ops::Sub for Point {
    type Output = Point;
    fn sub(self, rhs: Point) -> Point {
        Point::new(self.x - rhs.x, self.y - rhs.y)
    }
}

impl Point {
    pub fn new(x: f64, y: f64) -> Point {
        Point { x: x, y: y }
    }

    pub fn zero() -> Point {
        Point::new(0.0, 0.0)
    }

    pub fn abs(&self) -> Point {
        Point::new(self.x.abs(), self.y.abs())
    }

    pub fn rotate_by_center(&self, rotate: Angle) -> Point {
        self.rotate(Point::zero(), rotate)
    }

    pub fn rotate(&self, center: Point, rotate: Angle) -> Point {
        let rad = match rotate {
            Angle::Degree(deg) => 2.0 * deg * std::f64::consts::PI,
            Angle::Radian(rad) => rad,
        };
        let vec = self - center;
        let nx = vec.x * rad.cos() - vec.y * rad.sin();
        let ny = vec.x * rad.sin() + vec.y * rad.cos();
        Point::new(nx, ny)
    }
}

enum Angle {
    Degree(f64),
    Radian(f64),
}

fn main() {}