From c7110a8036f530efd8917a79ea4054e055bfee36 Mon Sep 17 00:00:00 2001
From: Mingun <Alexander_Sergey@mail.ru>
Date: Sat, 25 Feb 2023 22:17:27 +0500
Subject: [PATCH] Fix generation of non-existent lifetime 'de when enum
 contains a #[serde(flatten)] field and a 'static reference

---
 serde_derive/src/de.rs       |  2 +-
 test_suite/tests/test_gen.rs | 50 ++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/serde_derive/src/de.rs b/serde_derive/src/de.rs
index a703adaf7d..f9d23926cb 100644
--- a/serde_derive/src/de.rs
+++ b/serde_derive/src/de.rs
@@ -1006,7 +1006,7 @@ fn deserialize_struct(
 
                 fn deserialize<__D>(self, __deserializer: __D) -> _serde::__private::Result<Self::Value, __D::Error>
                 where
-                    __D: _serde::Deserializer<'de>,
+                    __D: _serde::Deserializer<#delife>,
                 {
                     _serde::Deserializer::deserialize_map(__deserializer, self)
                 }
diff --git a/test_suite/tests/test_gen.rs b/test_suite/tests/test_gen.rs
index c053d69031..f6782f68f2 100644
--- a/test_suite/tests/test_gen.rs
+++ b/test_suite/tests/test_gen.rs
@@ -892,3 +892,53 @@ pub struct RemotePackedNonCopyDef {
 impl Drop for RemotePackedNonCopyDef {
     fn drop(&mut self) {}
 }
+
+//////////////////////////////////////////////////////////////////////////
+
+/// Regression tests for <https://github.com/serde-rs/serde/issues/2371>
+#[allow(dead_code)]
+mod static_and_flatten {
+    use super::*;
+
+    #[derive(Deserialize)]
+    struct Nested;
+
+    #[derive(Deserialize)]
+    enum ExternallyTagged {
+        Flatten {
+            #[serde(flatten)]
+            nested: Nested,
+            string: &'static str,
+        },
+    }
+
+    #[derive(Deserialize)]
+    #[serde(tag = "tag")]
+    enum InternallyTagged {
+        Flatten {
+            #[serde(flatten)]
+            nested: Nested,
+            string: &'static str,
+        },
+    }
+
+    #[derive(Deserialize)]
+    #[serde(tag = "tag", content = "content")]
+    enum AdjacentlyTagged {
+        Flatten {
+            #[serde(flatten)]
+            nested: Nested,
+            string: &'static str,
+        },
+    }
+
+    #[derive(Deserialize)]
+    #[serde(untagged)]
+    enum UntaggedWorkaround {
+        Flatten {
+            #[serde(flatten)]
+            nested: Nested,
+            string: &'static str,
+        },
+    }
+}