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Add warning to RawValue docs regarding untagged enums #704

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Add warning to RawValue docs regarding untagged enums #704

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2 changes: 2 additions & 0 deletions src/raw.rs
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Expand Up @@ -23,6 +23,8 @@ use serde::ser::{Serialize, SerializeStruct, Serializer};
/// `RawValue` is only available if serde\_json is built with the `"raw_value"`
/// feature.
///
/// For [technical reasons](https://github.com/serde-rs/json/issues/497), `RawValue` can't be used with untagged enums at the moment. Trying to deserialize to an untagged enum with `RawValue`, therefore, always fails with an error.
///
/// ```toml
/// [dependencies]
/// serde_json = { version = "1.0", features = ["raw_value"] }
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