diff --git a/src/lib.rs b/src/lib.rs
index 51983f0..1880634 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -15,7 +15,7 @@
 
 #![crate_type = "rlib"]
 #![crate_type = "dylib"]
-#![feature(old_impl_check, plugin, core, std_misc, custom_derive)]
+#![feature(plugin, core, std_misc, custom_derive)]
 
 //! Computer graphics-centric math.
 //!
diff --git a/src/line.rs b/src/line.rs
index 595faf6..3156cbb 100644
--- a/src/line.rs
+++ b/src/line.rs
@@ -15,28 +15,35 @@
 
 //! Line segments
 
+use std::marker::PhantomData;
 use num::{BaseNum, BaseFloat, Zero, zero, One, one};
 use point::{Point, Point2, Point3};
-use vector::{Vector, Vector2};
+use vector::{Vector, Vector2, Vector3};
 use ray::{Ray2};
 use intersect::Intersect;
 
 /// A generic directed line segment from `origin` to `dest`.
 #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable)]
-pub struct Line<P> {
+pub struct Line<S, V, P> {
     pub origin: P,
     pub dest: P,
+    phantom_s: PhantomData<S>,
+    phantom_v: PhantomData<V>
 }
 
-#[old_impl_check]
-impl<S: BaseNum, V: Vector<S>, P: Point<S, V>>  Line<P> {
-    pub fn new(origin: P, dest: P) -> Line<P> {
-        Line { origin:origin, dest:dest }
+impl<S: BaseNum, V: Vector<S>, P: Point<S, V>>  Line<S, V, P> {
+    pub fn new(origin: P, dest: P) -> Line<S, V, P> {
+        Line {
+            origin: origin,
+            dest: dest,
+            phantom_v: PhantomData,
+            phantom_s: PhantomData
+        }
     }
 }
 
-pub type Line2<S> = Line<Point2<S>>;
-pub type Line3<S> = Line<Point3<S>>;
+pub type Line2<S> = Line<S, Vector2<S>, Point2<S>>;
+pub type Line3<S> = Line<S, Vector3<S>, Point3<S>>;
 
 /// Determines if an intersection between a ray and a line segment is found.
 impl<S: BaseFloat> Intersect<Option<Point2<S>>> for (Ray2<S>, Line2<S>) {