{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
                    let &(&impl1_def_id, impl_items1) = &impls_items[impl1_items_idx];
                for (i, &impl1_items_idx) in impl_blocks.iter().enumerate() {
                    res = res.and(self.check_for_duplicate_items_in_impl(impl1_def_id));