From d5e6436b287eb1b9f97a8b49e90458a6c2a3605a Mon Sep 17 00:00:00 2001
From: Tanner Rogalsky <tanner@tannerrogalsky.com>
Date: Sun, 17 May 2020 12:14:30 -0400
Subject: [PATCH] Add tests validating Serialize derivation for packed structs.

---
 test_suite/tests/test_macros.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/test_suite/tests/test_macros.rs b/test_suite/tests/test_macros.rs
index c0c807ec..bcd16b48 100644
--- a/test_suite/tests/test_macros.rs
+++ b/test_suite/tests/test_macros.rs
@@ -1878,3 +1878,19 @@ fn test_internally_tagged_newtype_variant_containing_unit_struct() {
         ],
     );
 }
+
+#[deny(safe_packed_borrows)]
+#[test]
+fn test_packed_struct_can_derive_serialize() {
+    #[derive(Copy, Clone, Serialize)]
+    #[repr(packed, C)]
+    struct PackedC {
+        t: f32,
+    }
+
+    #[derive(Copy, Clone, Serialize)]
+    #[repr(C, packed)]
+    struct CPacked {
+        t: f32,
+    }
+}