{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
                let f_in_trait = f_in_trait.as_local()?;
            implemented_trait_item.and_then(|f_in_trait| {
                if let Node::TraitItem(ti) = self.infcx.tcx.hir_node_by_def_id(f_in_trait)