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.
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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