{"ast_node_type":"variable","tokens":[{"end":33,"kind":"keyword","start":0,"text":"let"}]}
                        let msb =
                        let lsb = fx.bcx.ins().iconst(types::I64, niche_value as u64 as i64);
                            fx.bcx.ins().iconst(types::I64, (niche_value >> 64) as u64 as i64);