{"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"let"}]}
    let bits = fx.bcx.ins().iconcat(low, high);
    let high = fx.bcx.ins().band_imm(high, 0x7fff_ffff_ffff_ffff_u64 as i64);
    fx.bcx.ins().bitcast(types::F128, MemFlags::new(), bits)