78 lines
2.5 KiB
Rust
78 lines
2.5 KiB
Rust
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use serde_derive::Deserialize;
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fn d<T>() -> T {
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unimplemented!()
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}
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/// No errors expected:
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/// - if both fields are provided, both gets value from data
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/// - if only one field is provided, the second gets default value
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#[derive(Deserialize)]
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struct T1(u8, #[serde(default = "d")] u8);
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/// Errors expected -- the first field can get default value only if sequence is
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/// empty, but that mean that all other fields cannot be deserialized without
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/// errors, so the `#[serde(default)]` attribute is superfluous
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#[derive(Deserialize)]
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struct T2(#[serde(default = "d")] u8, u8, u8);
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/// No errors expected:
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/// - if both fields are provided, both gets value from data
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/// - if only one field is provided, the second gets default value
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/// - if none fields are provided, both gets default value
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#[derive(Deserialize)]
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struct T3(#[serde(default = "d")] u8, #[serde(default = "d")] u8);
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////////////////////////////////////////////////////////////////////////////////
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize, Default)]
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#[serde(default)]
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struct T1D(#[serde(default = "d")] u8, u8);
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize, Default)]
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#[serde(default)]
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struct T2D(u8, #[serde(default = "d")] u8);
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize, Default)]
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#[serde(default)]
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struct T3D(#[serde(default = "d")] u8, #[serde(default = "d")] u8);
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////////////////////////////////////////////////////////////////////////////////
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize)]
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#[serde(default = "d")]
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struct T1Path(#[serde(default)] u8, u8);
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize)]
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#[serde(default = "d")]
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struct T2Path(u8, #[serde(default)] u8);
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize)]
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#[serde(default = "d")]
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struct T3Path(#[serde(default)] u8, #[serde(default)] u8);
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////////////////////////////////////////////////////////////////////////////////
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize)]
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#[serde(default = "d")]
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struct T1PathD(#[serde(default = "d")] u8, u8);
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize)]
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#[serde(default = "d")]
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struct T2PathD(u8, #[serde(default = "d")] u8);
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/// No errors expected -- missing fields gets default values
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#[derive(Deserialize)]
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#[serde(default = "d")]
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struct T3PathD(#[serde(default = "d")] u8, #[serde(default = "d")] u8);
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fn main() {}
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