Use enums

src/main.rs

@@ -1,4 +1,5 @@
 use std::ops::{Add, Div, Mul, Sub};
+use std::collections::
 
 #[derive(Copy, Clone)]
 struct Vector3 {
@@ -120,6 +121,7 @@ impl Sphere {
 enum Geometry {
     Sphere(Sphere),
     Plane(Plane),
+    Line(Line),
 }
 
 fn main() {
@@ -140,6 +142,7 @@ fn main() {
         match geo {
             Geometry::Sphere(s) => println!("A Sphere"),
             Geometry::Plane(p) => println!("A Plane"),
+            Geometry::Line(l) => println!("A Line"),
         }
     }
 }