{"ast_node_type":"other","tokens":[{"end":21,"kind":"keyword","start":0,"text":"nb_locals:"}]}
    nb_locals: usize,
fn coroutine_saved_local_eligibility<VariantIdx: Idx, FieldIdx: Idx, LocalIdx: Idx>(
    variant_fields: &IndexSlice<VariantIdx, IndexVec<FieldIdx, LocalIdx>>,