{"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
    let res = fx.bcx.ins().band_imm(lhs, 0x7fff);
    let rhs = fx.bcx.ins().bitcast(types::I16, MemFlags::new(), rhs);
    let sign = fx.bcx.ins().band_imm(rhs, 0x8000);