Deserialize failed to derive on enums with tuple variant and flatten struct variant #1904
Description
This code is failed to compile due to panic in serde derive:
#[derive(Deserialize)]
enum Failed {
Tuple(f64, String),
Flatten {
#[serde(flatten)]
nested: Nested,
},
}Output:
Compiling playground v0.0.1 (/playground)
error: proc-macro derive panicked
--> src/lib.rs:30:10
|
30 | #[derive(Deserialize)]
| ^^^^^^^^^^^
|
= help: message: assertion failed: !cattrs.has_flatten()
error: aborting due to previous error
error: could not compile `playground`.
To learn more, run the command again with --verbose.Each variant individually and Serialize derive works well, problem is only in combination of tuple variant and struct variant, when struct variant contains flattened field.