{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"FieldOrTupleIdx::Field(f)"}]}
            FieldOrTupleIdx::Field(f) => layout.field_offset(f).unwrap_or(0),
        fields.sort_by_key(|&(f, _)| match f {
            FieldOrTupleIdx::TupleIdx(f) => layout.tuple_field_offset(f).unwrap_or(0),