{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"///"}]}
///                 let discr_exact = (variant_field.field("DISCR128_EXACT_LO" as u128) |
///             if variant_field.has_field("DISCR128_EXACT_LO") {
///                                   (variant_field.field("DISCR128_EXACT_HI") as u128 << 64);