Method from_attr

crates/derive-impl/src/util.rs:265–268

(item_ident: Ident, attr: &Attribute)

    const ALLOWED_NAMES: &'static [&'static str];

    fn from_attr(item_ident: Ident, attr: &Attribute) -> Result<Self> {
        let (meta_ident, nested) = attr.ident_and_promoted_nested()?;
        Self::from_nested(item_ident, meta_ident.clone(), nested.into_iter())
    }

    fn from_nested<I>(item_ident: Ident, meta_ident: Ident, nested: I) -> Result<Self>
    where