Add impls of the comparison operators for fixed-length arrays of lengths 0...32 and repair various cases where slices and fixed-length arrays were being compared.

src/libcore/lib.rs

@@ -126,6 +126,10 @@ pub mod tuple;
 pub mod unit;
 pub mod fmt;
 
+// note: does not need to be public
+#[cfg(not(stage0))]
+mod array;
+
 #[doc(hidden)]
 mod core {
     pub use panicking;