Method try_remove_name

crates/derive-impl/src/util.rs:552–587

(&mut self, item_name: &str)

    }

    fn try_remove_name(&mut self, item_name: &str) -> Result<Option<NestedMeta>> {
        self.try_meta_mut(|meta| {
            let nested = match meta {
                Meta::List(MetaList { nested, .. }) => Ok(nested),
                other => Err(syn::Error::new(
                    other.span(),
                    format!(
                        "#[{name}(...)] doesn't contain '{item}' to remove",
                        name = other.get_ident().unwrap(),
                        item = item_name
                    ),
                )),
            }?;

            let mut found = None;
            for (i, item) in nested.iter().enumerate() {
                let ident = if let Some(ident) = item.get_ident() {
                    ident
                } else {
                    continue;
                };
                if *ident != item_name {
                    continue;
                }
                if found.is_some() {
                    return Err(syn::Error::new(
                        item.span(),
                        format!("#[py..({item_name}...)] must be unique but found multiple times"),
                    ));
                }
                found = Some(i);
            }

            Ok(found.map(|idx| nested.remove(idx).into_value()))
        })
    }

    fn fill_nested_meta<F>(&mut self, name: &str, new_item: F) -> Result<()>
    where