Implement Display for Identity.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name    = "nalgebra"
-version = "0.8.1"
+version = "0.8.2"
 authors = [ "Sébastien Crozet <developer@crozet.re>" ] # FIXME: add the contributors.
 
 description = "Linear algebra library for computer physics, computer graphics and general low-dimensional linear algebra for Rust."

src/structs/matrix.rs

@@ -35,6 +35,12 @@ impl Identity {
     }
 }
 
+impl fmt::Display for Identity {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Identity")
+    }
+}
+
 /// Square matrix of dimension 1.
 #[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]