Change the assert_eq message to be more verbose.

Closes #6221
2013-07-10 13:07:26 -04:00 · 2013-07-10 13:07:26 -04:00 · 8dc6445e38
commit 8dc6445e38
parent 8fa09736ef
1 changed files with 2 additions and 1 deletions
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@ -531,7 +531,8 @@ pub fn core_macros() -> @str {
                let expected_val = $expected;
                // check both directions of equality....
                if !((given_val == expected_val) && (expected_val == given_val)) {
-                    fail!(\"left: %? does not equal right: %?\", given_val, expected_val);
+                    fail!(\"assertion failed: `(left == right) && (right == \
+                    left)` (left: `%?`, right: `%?`)\", given_val, expected_val);
                }
            }
        )