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Detect extraneous fields before generating From

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David Tolnay 2019-10-12 17:26:48 -07:00
parent 2492735b67
commit 0e8d1baa69
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1 changed files with 8 additions and 0 deletions
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8
impl/src/valid.rs
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@ -135,6 +135,14 @@ fn check_field_attrs(fields: &[Field]) -> Result<()> {
));
}
}
if let Some(from_field) = from_field {
if fields.len() > 1 {
return Err(Error::new_spanned(
from_field.attrs.from,
"deriving From requires no fields other than source",
));
}
}
Ok(())
}