如何修复 Encodable/Decodable 弃用? [英] How do I fix Encodable/Decodable deprecation?

问题描述

一些存储库(例如 https://github.com/sebcrozet/nalgebra)有错误

A few repos (e.g. https://github.com/sebcrozet/nalgebra) have errors along the lines of

warning: deriving(Decodable) is deprecated in favor of deriving(RustcDecodable).

用 RustcDecodable 替换 Decodable 原因

error: attempt to bound type parameter with a nonexistent trait `rustc_serialize::Decoder`

如何更新这些内容?

推荐答案

我相信你的错误来自 这个提交:

I believe that your error comes from this commit:

此提交完成了 in-tree 的弃用故事序列化库.编译器现在会在任何时候发出警告它遇到 deriving(Encodable) 或 deriving(Decodable)，并且库本身现在标记为 #[unstable] 用于当功能暂存时已启用.

This commit completes the deprecation story for the in-tree serialization library. The compiler will now emit a warning whenever it encounters deriving(Encodable) or deriving(Decodable), and the library itself is now marked #[unstable] for when feature staging is enabled.

所有序列化用户都可以迁移到 rustc-serialize crate在 crates.io 上，它提供了与libserialize 库内树.新的派生模式被命名为RustcEncodable 和 RustcDecodable 并且需要 extern crate"rustc-serialize" 作为 rustc_serialize 在 crate 根，以便正确展开.

All users of serialization can migrate to the rustc-serialize crate on crates.io which provides the exact same interface as the libserialize library in-tree. The new deriving modes are named RustcEncodable and RustcDecodable and require extern crate "rustc-serialize" as rustc_serialize at the crate root in order to expand correctly.

要迁移所有 crate，请将以下内容添加到您的 Cargo.toml:

To migrate all crates, add the following to your Cargo.toml:

[dependencies]
rustc-serialize = "0.1.1"

然后将以下内容添加到您的 crate 根目录中:

And then add the following to your crate root:

extern crate "rustc-serialize" as rustc_serialize;

最后，将 Encodable 和 Decodable 派生模式重命名为RustcEncodable 和 RustcDecodable.

Finally, rename Encodable and Decodable deriving modes to RustcEncodable and RustcDecodable.

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