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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/de.rs
+5
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@@ -1,5 +1,6 @@
use crate::fragment::{Expr, 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, ungroup, Ctxt, Derive};
use crate::{bound, dummy, pretend, this};
@@ -22,6 +23,8 @@ pub fn expand_derive_deserialize(input: &mut syn::DeriveInput) -> syn::Result<To
precondition(&ctxt, &cont);
ctxt.check()?;
let allow_deprecated = allow_deprecated(input)?;
let ident = &cont.ident;
let params = Parameters::new(&cont);
let (de_impl_generics, _, ty_generics, where_clause) = split_with_de_lifetime(&params);
@@ -34,6 +37,7 @@ pub fn expand_derive_deserialize(input: &mut syn::DeriveInput) -> syn::Result<To
let used = pretend::pretend_used(&cont, params.is_packed);
quote! {
#[automatically_derived]
#allow_deprecated
impl #de_impl_generics #ident #ty_generics #where_clause {
#vis fn deserialize<__D>(__deserializer: __D) -> #serde::__private::Result<#remote #ty_generics, __D::Error>
where
@@ -49,6 +53,7 @@ pub fn expand_derive_deserialize(input: &mut syn::DeriveInput) -> syn::Result<To
quote! {
#[automatically_derived]
#allow_deprecated
impl #de_impl_generics #serde::Deserialize<#delife> for #ident #ty_generics #where_clause {
fn deserialize<__D>(__deserializer: __D) -> #serde::__private::Result<Self, __D::Error>
where