Method promoted_nested

crates/derive-impl/src/util.rs:536–547

(&self)

impl AttributeExt for Attribute {
    fn promoted_nested(&self) -> Result<PunctuatedNestedMeta> {
        let list = self.promoted_list().map_err(|mut e| {
            let name = self.get_ident().unwrap().to_string();
            e.combine(err_span!(
                self,
                r##"#[{name} = "..."] cannot be a name/value, you probably meant \
                 #[{name}(name = "...")]"##,
            ));
            e
        })?;
        Ok(list.nested)
    }
    fn ident_and_promoted_nested(&self) -> Result<(&Ident, PunctuatedNestedMeta)> {
        Ok((self.get_ident().unwrap(), self.promoted_nested()?))
    }