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add #[allow(deprecated)] to derive implementations

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Allow deprecated in the `Serialize`/`Deserialize`
derive implementations. This allows you to
deprecate structs, enums, struct fields, or enum
variants and not get compiler warnings/errors
about use of deprecated thing. We only do this
if `#[deprecated]` or `#[allow(deprecated)]` exist
on the root object or the variants of the root
object (if it is an enum).

Resolves #2195
This commit is contained in:
Ryan Crisanti
2025-01-08 13:26:17 -05:00
parent da3998acfb
commit ae38b27aee
9 changed files with 164 additions and 0 deletions
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serde_derive/src/ser.rs
+4
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@@ -1,5 +1,6 @@
use crate::fragment::{Fragment, Match, Stmts};
use crate::internals::ast::{Container, Data, Field, Style, Variant};
use crate::internals::deprecated::allow_deprecated;
use crate::internals::name::Name;
use crate::internals::{attr, replace_receiver, Ctxt, Derive};
use crate::{bound, dummy, pretend, this};
@@ -18,6 +19,7 @@ pub fn expand_derive_serialize(input: &mut syn::DeriveInput) -> syn::Result<Toke
};
precondition(&ctxt, &cont);
ctxt.check()?;
let allow_deprecated = allow_deprecated(input)?;
let ident = &cont.ident;
let params = Parameters::new(&cont);
@@ -30,6 +32,7 @@ pub fn expand_derive_serialize(input: &mut syn::DeriveInput) -> syn::Result<Toke
let used = pretend::pretend_used(&cont, params.is_packed);
quote! {
#[automatically_derived]
#allow_deprecated
impl #impl_generics #ident #ty_generics #where_clause {
#vis fn serialize<__S>(__self: &#remote #ty_generics, __serializer: __S) -> #serde::__private::Result<__S::Ok, __S::Error>
where
@@ -43,6 +46,7 @@ pub fn expand_derive_serialize(input: &mut syn::DeriveInput) -> syn::Result<Toke
} else {
quote! {
#[automatically_derived]
#allow_deprecated
impl #impl_generics #serde::Serialize for #ident #ty_generics #where_clause {
fn serialize<__S>(&self, __serializer: __S) -> #serde::__private::Result<__S::Ok, __S::Error>
where