{"ast_node_type":"function","tokens":[{"end":93,"kind":"keyword","start":0,"text":"fn"}]}
    fn check_autodiff(&self, _hir_id: HirId, _attr: &Attribute, span: Span, target: Target) {
    /// Checks if `#[autodiff]` is applied to an item other than a function item.
        debug!("check_autodiff");