31 lines
865 B
Rust
31 lines
865 B
Rust
use darling::FromMeta;
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// This usage of `from_word` is invalid because unit structs already generate a from_word
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// method, and we don't allow using the from_word override when it conflicts with the macro's
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// "normal" operation.
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#[derive(FromMeta)]
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#[darling(from_word = || Ok(Unit))]
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struct Unit;
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fn newtype_from_word() -> darling::Result<Newtype> {
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Ok(Newtype(true))
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}
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// This usage of `from_word` is invalid because newtype structs call the inner type's `from_meta`
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// directly from their `from_meta`, so the custom `from_word` will never be called in normal usage.
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#[derive(FromMeta)]
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#[darling(from_word = newtype_from_word)]
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struct Newtype(bool);
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#[derive(FromMeta)]
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#[darling(from_word = || Ok(Wordy::Options { thing: "Hello".to_string() }))]
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enum Wordy {
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#[darling(word)]
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Normal,
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Options {
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thing: String,
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},
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}
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fn main() {}
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