From 547d843ccaa1349b074991f5ceeda722cf245824 Mon Sep 17 00:00:00 2001
From: Mingun <Alexander_Sergey@mail.ru>
Date: Sun, 11 Aug 2024 19:22:47 +0500
Subject: [PATCH] Remove dead code - serialize_struct_as_map always called when
 cattrs.has_flatten()==true

---
 serde_derive/src/ser.rs | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/serde_derive/src/ser.rs b/serde_derive/src/ser.rs
index a0291aff7..f745bf675 100644
--- a/serde_derive/src/ser.rs
+++ b/serde_derive/src/ser.rs
@@ -376,26 +376,8 @@ fn serialize_struct_as_map(
 
     let let_mut = mut_if(serialized_fields.peek().is_some() || tag_field_exists);
 
-    let len = if cattrs.has_flatten() {
-        quote!(_serde::__private::None)
-    } else {
-        let len = serialized_fields
-            .map(|field| match field.attrs.skip_serializing_if() {
-                None => quote!(1),
-                Some(path) => {
-                    let field_expr = get_member(params, field, &field.member);
-                    quote!(if #path(#field_expr) { 0 } else { 1 })
-                }
-            })
-            .fold(
-                quote!(#tag_field_exists as usize),
-                |sum, expr| quote!(#sum + #expr),
-            );
-        quote!(_serde::__private::Some(#len))
-    };
-
     quote_block! {
-        let #let_mut __serde_state = _serde::Serializer::serialize_map(__serializer, #len)?;
+        let #let_mut __serde_state = _serde::Serializer::serialize_map(__serializer, _serde::__private::None)?;
         #tag_field
         #(#serialize_fields)*
         _serde::ser::SerializeMap::end(__serde_state)