From 27bfe381d981a0cfc197290887e097560a992f06 Mon Sep 17 00:00:00 2001
From: Eduard Bopp <eduard.bopp@aepsil0n.de>
Date: Tue, 3 Feb 2015 19:17:15 +0100
Subject: [PATCH] Workaround internal compiler error

The associated type bound here was not parsed correctly. This is likely due to
the ICE described in rust-lang/rust#20413.
---
 src/lib.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 274a0ca7..b01c089a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -98,7 +98,7 @@ extern crate quickcheck;
 extern crate test;
 
 use std::cmp;
-use std::ops::Neg;
+use std::ops::{Neg, Mul};
 pub use traits::{
     Absolute,
     AbsoluteRotate,
@@ -608,7 +608,12 @@ pub fn append_rotation_wrt_center<LV: Neg<Output = LV> + Copy,
 
 /// Builds a rotation matrix from `r`.
 #[inline(always)]
-pub fn to_rot_mat<N, LV, AV, R: RotationMatrix<N, LV, AV>>(r: &R) -> R::Output {
+pub fn to_rot_mat<N, LV, AV, R, M>(r: &R) -> M
+    where R: RotationMatrix<N, LV, AV, Output=M>,
+          M: Mat<N, LV, AV> + Rotation<AV> + Col<LV> + Copy,
+          LV: Mul<M, Output=LV> + Copy,
+{
+    // FIXME: rust-lang/rust#20413
     r.to_rot_mat()
 }