From fd94bd984e6e0772f501e57f9b2f36a3ac420640 Mon Sep 17 00:00:00 2001
From: Tim Chevalier <chevalier@alum.wellesley.edu>
Date: Tue, 14 May 2013 13:02:54 -0700
Subject: [PATCH] testsuite: Add passing test for #4107

---
 src/test/run-pass/issue-4107.rs | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 src/test/run-pass/issue-4107.rs

diff --git a/src/test/run-pass/issue-4107.rs b/src/test/run-pass/issue-4107.rs
new file mode 100644
index 00000000000..94a42db047e
--- /dev/null
+++ b/src/test/run-pass/issue-4107.rs
@@ -0,0 +1,33 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+    let id: &Mat2<float> = &Matrix::identity();
+}
+
+pub trait Index<Index,Result> { }
+pub trait Dimensional<T>: Index<uint, T> { }
+
+pub struct Mat2<T> { x: () }
+pub struct Vec2<T> { x: () }
+
+impl<T> Dimensional<Vec2<T>> for Mat2<T> { }
+impl<T> Index<uint, Vec2<T>> for Mat2<T> { }
+
+impl<T> Dimensional<T> for Vec2<T> { }
+impl<T> Index<uint, T> for Vec2<T> { }
+
+pub trait Matrix<T,V>: Dimensional<V> {
+    fn identity() -> Self;
+}
+
+impl<T> Matrix<T, Vec2<T>> for Mat2<T> {
+    fn identity() -> Mat2<T> { Mat2{ x: () } }
+}