{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
            let containing_impl_is_for_trait = match &containing_item.kind {
            let containing_item = tcx.hir_expect_item(parent_def_id);
                hir::ItemKind::Impl(impl_) => impl_.of_trait.is_some(),