From 2ba97394fb5e5c32b52ab8d82aed45b85fef0db7 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Mon, 25 Jan 2021 13:27:15 -0800
Subject: [PATCH] Substitute Self in output of Serialize derive

---
 serde_derive/src/lib.rs | 4 ++--
 serde_derive/src/ser.rs | 8 ++++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/serde_derive/src/lib.rs b/serde_derive/src/lib.rs
index f10baac0..8d1464ec 100644
--- a/serde_derive/src/lib.rs
+++ b/serde_derive/src/lib.rs
@@ -79,8 +79,8 @@ mod try;
 
 #[proc_macro_derive(Serialize, attributes(serde))]
 pub fn derive_serialize(input: TokenStream) -> TokenStream {
-    let input = parse_macro_input!(input as DeriveInput);
-    ser::expand_derive_serialize(&input)
+    let mut input = parse_macro_input!(input as DeriveInput);
+    ser::expand_derive_serialize(&mut input)
         .unwrap_or_else(to_compile_errors)
         .into()
 }
diff --git a/serde_derive/src/ser.rs b/serde_derive/src/ser.rs
index 91154dc6..c663c3b0 100644
--- a/serde_derive/src/ser.rs
+++ b/serde_derive/src/ser.rs
@@ -6,10 +6,14 @@ use bound;
 use dummy;
 use fragment::{Fragment, Match, Stmts};
 use internals::ast::{Container, Data, Field, Style, Variant};
-use internals::{attr, Ctxt, Derive};
+use internals::{attr, replace_receiver, Ctxt, Derive};
 use pretend;
 
-pub fn expand_derive_serialize(input: &syn::DeriveInput) -> Result<TokenStream, Vec<syn::Error>> {
+pub fn expand_derive_serialize(
+    input: &mut syn::DeriveInput,
+) -> Result<TokenStream, Vec<syn::Error>> {
+    replace_receiver(input);
+
     let ctxt = Ctxt::new();
     let cont = match Container::from_ast(&ctxt, input, Derive::Serialize) {
         Some(cont) => cont,