{"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
    let (low, lhs_high) = fx.bcx.ins().isplit(lhs);
    let rhs = fx.bcx.ins().bitcast(types::I128, MemFlags::new(), rhs);
    let (_, rhs_high) = fx.bcx.ins().isplit(rhs);