Get cgmath building in beta by removing remaining unstable feature use. Benching is unstable and therefore only available on nightly; removed from travis in the interim.

.travis.yml

@@ -22,7 +22,6 @@ env:
 script:
   - cargo build
   - cargo test
-  - cargo bench
   - cargo doc
 after_script:
   # the doc directory needs to be in the root for rust-ci

src/angle.rs

@@ -276,10 +276,11 @@ impl<S: BaseFloat> One for Deg<S> {
     fn one() -> Deg<S> { deg(one()) }
 }
 
+const PI_2: f64 = f64::consts::PI * 2f64;
 impl<S: BaseFloat>
 Angle<S> for Rad<S> {
     #[inline] fn from<A: Angle<S>>(theta: A) -> Rad<S> { theta.to_rad() }
-    #[inline] fn full_turn() -> Rad<S> { rad(cast(f64::consts::PI_2).unwrap()) }
+    #[inline] fn full_turn() -> Rad<S> { rad(cast(PI_2).unwrap()) }
 }
 
 impl<S: BaseFloat>

src/lib.rs

@@ -15,7 +15,6 @@
 
 #![crate_type = "rlib"]
 #![crate_type = "dylib"]
-#![feature(plugin, core, custom_derive)]
 
 //! Computer graphics-centric math.
 //!

src/rotation.rs

@@ -133,7 +133,6 @@ pub trait Rotation3<S: BaseNum>: Rotation<S, Vector3<S>, Point3<S>>
 /// matrix:
 ///
 /// ```no_run
-/// #![feature(core)]
 /// use cgmath::rad;
 /// use cgmath::Vector2;
 /// use cgmath::{Matrix, ToMatrix2};

src/transform.rs

@@ -14,6 +14,7 @@
 // limitations under the License.
 
 use std::fmt;
+use std::marker::PhantomFn;
 
 use rust_num::{zero, one};
 
@@ -237,7 +238,10 @@ impl<S: BaseFloat + 'static> Transform3<S> for AffineMatrix3<S> {}
 
 /// A trait that allows extracting components (rotation, translation, scale)
 /// from an arbitrary transformations
-pub trait ToComponents<S, V: Vector<S>, P: Point<S, V>, R: Rotation<S, V, P>> {
+// PhantomFn works around a beta bug in deteriming the usage of S/P, and should be safely removed
+// when PhantomFn deprecation lands in stable.
+pub trait ToComponents<S: BaseNum, V: Vector<S>, P: Point<S, V>, R: Rotation<S, V, P>> 
+    : PhantomFn<S> + PhantomFn<P> {
     /// Extract the (scale, rotation, translation) triple
     fn decompose(&self) -> (V, R, V);
 }