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Merge pull request #2553 from Mingun/default-on-tuples

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Allow `#[serde(default)]` on tuple structs
This commit is contained in:
David Tolnay
2023-08-05 22:12:10 -07:00
committed by GitHub
parent 4d93e9f44c 5c33931422
commit 73931692b2
13 changed files with 230 additions and 60 deletions
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serde_derive/src/internals/attr.rs
+10 -10
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@@ -396,20 +396,20 @@ impl Container {
if let Some(path) = parse_lit_into_expr_path(cx, DEFAULT, &meta)? {
match &item.data {
syn::Data::Struct(syn::DataStruct { fields, .. }) => match fields {
syn::Fields::Named(_) => {
syn::Fields::Named(_) | syn::Fields::Unnamed(_) => {
default.set(&meta.path, Default::Path(path));
}
syn::Fields::Unnamed(_) | syn::Fields::Unit => {
let msg = "#[serde(default = \"...\")] can only be used on structs with named fields";
syn::Fields::Unit => {
let msg = "#[serde(default = \"...\")] can only be used on structs with fields";
cx.syn_error(meta.error(msg));
}
},
syn::Data::Enum(_) => {
let msg = "#[serde(default = \"...\")] can only be used on structs with named fields";
let msg = "#[serde(default = \"...\")] can only be used on structs with fields";
cx.syn_error(meta.error(msg));
}
syn::Data::Union(_) => {
let msg = "#[serde(default = \"...\")] can only be used on structs with named fields";
let msg = "#[serde(default = \"...\")] can only be used on structs with fields";
cx.syn_error(meta.error(msg));
}
}
@@ -418,20 +418,20 @@ impl Container {
// #[serde(default)]
match &item.data {
syn::Data::Struct(syn::DataStruct { fields, .. }) => match fields {
syn::Fields::Named(_) => {
syn::Fields::Named(_) | syn::Fields::Unnamed(_) => {
default.set(meta.path, Default::Default);
}
syn::Fields::Unnamed(_) | syn::Fields::Unit => {
let msg = "#[serde(default)] can only be used on structs with named fields";
syn::Fields::Unit => {
let msg = "#[serde(default)] can only be used on structs with fields";
cx.error_spanned_by(fields, msg);
}
},
syn::Data::Enum(_) => {
let msg = "#[serde(default)] can only be used on structs with named fields";
let msg = "#[serde(default)] can only be used on structs with fields";
cx.syn_error(meta.error(msg));
}
syn::Data::Union(_) => {
let msg = "#[serde(default)] can only be used on structs with named fields";
let msg = "#[serde(default)] can only be used on structs with fields";
cx.syn_error(meta.error(msg));
}
}