Rename assert_eq arguments to left and right.

The names expected and actual are not used anymore in the output. It also
removes the confusion that the argument order is the opposite of junit.

Author: nielsegberts

src/libstd/macros.rs

@@ -120,14 +120,14 @@ macro_rules! assert(
 /// ```
 #[macro_export]
 macro_rules! assert_eq(
-    ($given:expr , $expected:expr) => ({
-        match (&($given), &($expected)) {
-            (given_val, expected_val) => {
+    ($left:expr , $right:expr) => ({
+        match (&($left), &($right)) {
+            (left_val, right_val) => {
                 // check both directions of equality....
-                if !((*given_val == *expected_val) &&
-                     (*expected_val == *given_val)) {
+                if !((*left_val == *right_val) &&
+                     (*right_val == *left_val)) {
                     panic!("assertion failed: `(left == right) && (right == left)` \
-                           (left: `{}`, right: `{}`)", *given_val, *expected_val)
+                           (left: `{}`, right: `{}`)", *left_val, *right_val)
                 }
             }
         }