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Support deserializing a flattened internally tagged enum #1245

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merged 2 commits into from May 6, 2018
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@dtolnay dtolnay commented May 6, 2018

Fixes #1189.

@dtolnay dtolnay requested a review from mitsuhiko May 6, 2018 04:43
The fact that the tag entry is consumed was only observable if there is
a later flattened map field, at which point the behavior is already
confusing anyway.

    #[derive(Deserialize)]
    struct Example {
        #[serde(flatten)]
        a: InternallyTagged,
        #[serde(flatten)]
        rest: BTreeMap<String, Value>,
    }

Before this simplification the map would receive all the fields of the
internally tagged enum but not its tag, after it receives all the fields
including the tag.
@dtolnay dtolnay merged commit 6374467 into master May 6, 2018
@dtolnay dtolnay deleted the flat branch May 6, 2018 20:45
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