Remove useless import

src/dim.rs

@@ -1,5 +1,3 @@
-use core::cmp::Eq;
-
 pub trait Dimensional<T>: Index<uint, T> {
     static pure fn dim() -> uint;       // dim and size_of are pretty useless at the moment due to
     static pure fn size_of() -> uint;   // how Rust's static methods are currently implemented