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Merge pull request #1205 from mitsuhiko/bugfix/tuple-struct-flatten

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Produce error message for use of flatten in tuple structs
This commit is contained in:
David Tolnay
2018-04-02 07:09:39 +02:00
committed by GitHub
parent 6f6c60867d 77376f39ea
commit 860241aa88
3 changed files with 42 additions and 1 deletions
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serde_derive_internals/src/check.rs
+10 -1
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@@ -49,11 +49,20 @@ fn check_flatten(cx: &Ctxt, cont: &Container) {
cx.error("#[serde(flatten)] cannot be used within enums");
}
}
Data::Struct(_, _) => {
Data::Struct(style, _) => {
for field in cont.data.all_fields() {
if !field.attrs.flatten() {
continue;
}
match style {
Style::Tuple => {
cx.error("#[serde(flatten)] cannot be used on tuple structs");
}
Style::Newtype => {
cx.error("#[serde(flatten)] cannot be used on newtype structs");
}
_ => {}
}
if field.attrs.skip_serializing() {
cx.error(
"#[serde(flatten] can not be combined with \