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Allow internal tag field in untagged variant #2646

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merged 1 commit into from Nov 7, 2023
Merged

Allow internal tag field in untagged variant #2646

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3 changes: 3 additions & 0 deletions serde_derive/src/internals/check.rs
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Expand Up @@ -318,6 +318,9 @@ fn check_internal_tag_field_name_conflict(cx: &Ctxt, cont: &Container) {
for variant in variants {
match variant.style {
Style::Struct => {
if variant.attrs.untagged() {
continue;
}
for field in &variant.fields {
let check_ser =
!(field.attrs.skip_serializing() || variant.attrs.skip_serializing());
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94 changes: 94 additions & 0 deletions test_suite/tests/test_macros.rs
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Expand Up @@ -814,6 +814,100 @@ fn test_internally_tagged_enum() {
);
}

#[test]
fn test_internally_tagged_enum_with_untagged_variant() {
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(tag = "kind")]
enum InternallyTagged {
Tagged {
a: u8,
},
#[serde(untagged)]
Untagged {
kind: String,
b: u8,
},
}

assert_de_tokens(
&InternallyTagged::Tagged { a: 1 },
&[
Token::Map { len: Some(2) },
Token::Str("kind"),
Token::Str("Tagged"),
Token::Str("a"),
Token::U8(1),
Token::MapEnd,
],
);

assert_tokens(
&InternallyTagged::Tagged { a: 1 },
&[
Token::Struct {
name: "InternallyTagged",
len: 2,
},
Token::Str("kind"),
Token::Str("Tagged"),
Token::Str("a"),
Token::U8(1),
Token::StructEnd,
],
);

assert_de_tokens(
&InternallyTagged::Untagged {
kind: "Foo".to_owned(),
b: 2,
},
&[
Token::Map { len: Some(2) },
Token::Str("kind"),
Token::Str("Foo"),
Token::Str("b"),
Token::U8(2),
Token::MapEnd,
],
);

assert_tokens(
&InternallyTagged::Untagged {
kind: "Foo".to_owned(),
b: 2,
},
&[
Token::Struct {
name: "InternallyTagged",
len: 2,
},
Token::Str("kind"),
Token::Str("Foo"),
Token::Str("b"),
Token::U8(2),
Token::StructEnd,
],
);

assert_tokens(
&InternallyTagged::Untagged {
kind: "Tagged".to_owned(),
b: 2,
},
&[
Token::Struct {
name: "InternallyTagged",
len: 2,
},
Token::Str("kind"),
Token::Str("Tagged"),
Token::Str("b"),
Token::U8(2),
Token::StructEnd,
],
);
}

#[test]
fn test_internally_tagged_bytes() {
#[derive(Debug, PartialEq, Deserialize)]
Expand Down