{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"iter::repeat(IndexVec::new()).take(CoroutineArgs::RESERVED_VARIANTS).collect();"}]}
                    iter::repeat(IndexVec::new()).take(CoroutineArgs::RESERVED_VARIANTS).collect();
                let variant_fields: IndexVec<VariantIdx, IndexVec<FieldIdx, CoroutineSavedLocal>> =
                let variant_source_info: IndexVec<VariantIdx, SourceInfo> =