From df0ceaab6fe52038b372a881d450fe3b672726d1 Mon Sep 17 00:00:00 2001
From: Chris Tsang <chris.2y3@outlook.com>
Date: Sat, 1 Jun 2024 18:45:34 +0100
Subject: [PATCH] recursive enum

---
 tests/hash_enum.rs | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/tests/hash_enum.rs b/tests/hash_enum.rs
index c7fd056..bf3494c 100644
--- a/tests/hash_enum.rs
+++ b/tests/hash_enum.rs
@@ -405,3 +405,42 @@ fn bound_3() {
     assert_ne!(unit_hash, struct_hash);
     assert_ne!(struct_hash, tuple_hash);
 }
+
+#[test]
+fn recursive_1() {
+    #[derive(Educe)]
+    #[educe(Hash)]
+    enum Enum {
+        Unit,
+        Unit2,
+        Boxed(Box<Enum>),
+    }
+
+    let unit_hash = {
+        let mut hasher = DefaultHasher::new();
+
+        Enum::Unit.hash(&mut hasher);
+
+        hasher.finish()
+    };
+
+    let unit2_hash = {
+        let mut hasher = DefaultHasher::new();
+
+        Enum::Unit2.hash(&mut hasher);
+
+        hasher.finish()
+    };
+
+    let unit3_hash = {
+        let mut hasher = DefaultHasher::new();
+
+        Enum::Boxed(Box::new(Enum::Unit)).hash(&mut hasher);
+
+        hasher.finish()
+    };
+
+    assert_ne!(unit_hash, unit2_hash);
+    assert_ne!(unit_hash, unit3_hash);
+    assert_ne!(unit2_hash, unit3_hash);
+}
\ No newline at end of file