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Only allow #[serde(default)]` on structs

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This commit is contained in:
Thomas de Zeeuw 2017-02-21 00:15:00 +01:00
parent 9444db5f19
commit 7bee779514
3 changed files with 24 additions and 1 deletions
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9
serde_codegen_internals/src/attr.rs
View File

@ -167,7 +167,14 @@ impl Item {
// Parse `#[serde(default)]`
MetaItem(Word(ref name)) if name == "default" => {
default.set_true();
match item.body {
syn::Body::Struct(_) => {
default.set_true();
}
_ => {
cx.error("#[serde(default)] can only be used on structs")
}
}
}
// Parse `#[serde(bound="D: Serialize")]`

8
test_suite/tests/compile-fail/default-attribute/enum.rs Normal file
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@ -0,0 +1,8 @@
#[macro_use]
extern crate serde_derive;
#[derive(Deserialize)] //~ ERROR: proc-macro derive panicked
#[serde(default)] //~^ HELP: #[serde(default)] can only be used on structs
enum E {
S { f: u8 },
}

8
test_suite/tests/compile-fail/default-attribute/nameless_struct_fields.rs Normal file
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@ -0,0 +1,8 @@
#[macro_use]
extern crate serde_derive;
#[derive(Deserialize)] //~ ERROR: proc-macro derive panicked
#[serde(default)] //~^ HELP: #[serde(default)] can only be used on structs
struct T(u8, u8);
fn main() { }