diff --git a/src/utils.rs b/src/utils.rs
index a9ef028..2bde138 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -22,3 +22,9 @@ pub macro n {
         $s.next().unwrap()
     }
 }
+
+pub macro di {
+    ($left: expr, $right: expr) => {
+        std::mem::discriminant(&$left) == std::mem::discriminant(&$right)
+    }
+}