{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
                let variant_source_info: IndexVec<VariantIdx, SourceInfo> =
                    iter::repeat(IndexVec::new()).take(CoroutineArgs::RESERVED_VARIANTS).collect();
                    iter::repeat(source_info).take(CoroutineArgs::RESERVED_VARIANTS).collect();