Macros on rustbiteshttps://www.rustbites.com/tags/macros/Recent content in Macros on rustbitesHugoenSat, 30 May 2026 18:44:06 +0200171. assert_matches! — A Test Failure That Actually Tells You What Went Wronghttps://www.rustbites.com/posts/bite-171/Sat, 30 May 2026 09:00:00 +0100https://www.rustbites.com/posts/bite-171/<p><code>assert!(matches!(x, Foo::Bar))</code> panics with <code>assertion failed: matches!(x, Foo::Bar)</code> and zero hint about what <code>x</code> actually was. Rust 1.96 stabilises <code>assert_matches!</code>, which prints the offending value for you.</p>