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Do not generate DeserializeSeed impl when not needed

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This function is called for untagged, internally and externally tagged enums,
but `deserializer` parameter is `None` only for the latest. Only when it's `None`
`DeserializeSeed` impl is used
This commit is contained in:
Mingun
2023-02-27 21:08:30 +05:00
parent c7393614ff
commit 38c130a303
1 changed files with 2 additions and 1 deletions
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serde_derive/src/de.rs
+2 -1
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@@ -954,6 +954,7 @@ fn deserialize_struct(
lifetime: _serde::__private::PhantomData, lifetime: _serde::__private::PhantomData,
} }
}; };
let need_seed = deserializer.is_none();
let dispatch = if let Some(deserializer) = deserializer { let dispatch = if let Some(deserializer) = deserializer {
quote! { quote! {
_serde::Deserializer::deserialize_any(#deserializer, #visitor_expr) _serde::Deserializer::deserialize_any(#deserializer, #visitor_expr)
@@ -999,7 +1000,7 @@ fn deserialize_struct(
_ => None, _ => None,
}; };
let visitor_seed = if is_enum && cattrs.has_flatten() { let visitor_seed = if need_seed && is_enum && cattrs.has_flatten() {
Some(quote! { Some(quote! {
impl #de_impl_generics _serde::de::DeserializeSeed<#delife> for __Visitor #de_ty_generics #where_clause { impl #de_impl_generics _serde::de::DeserializeSeed<#delife> for __Visitor #de_ty_generics #where_clause {
type Value = #this_type #ty_generics; type Value = #this_type #ty_generics;