Rust的最新版本：
$ rustc --version
rustc 1.0.0-nightly (6c065fc8c 2015-02-17) (built 2015-02-18)
根据文档，它应该编译（并在之前编译）：
use serialize::base64;
use serialize::base64::{ToBase64, FromBase64};
但是它说
src/lib.rs:6:5: 6:22 error: unresolved import `serialize::base64`. There is no `base64` in `serialize`
src/lib.rs:6 use serialize::base64;
^~~~~~~~~~~~~~~~~
src/lib.rs:7:25: 7:33 error: unresolved import `serialize::base64::ToBase64`. Could not find `base64` in `serialize`
src/lib.rs:7 use serialize::base64::{ToBase64, FromBase64};
^~~~~~~~
src/lib.rs:7:35: 7:45 error: unresolved import `serialize::base64::FromBase64`. Could not find `base64` in `serialize`
src/lib.rs:7 use serialize::base64::{ToBase64, FromBase64};
^~~~~~~~~~
error: aborting due to 3 previous errors
您正在使用Nightlies，因此应参考Nightlies文档。
将serialize板条箱移至crates.io上的外部存储库以使用它，只需插入
[dependencies]
rustc-serialize = "0.2"
在您的计算机中，Cargo.toml然后使用以下命令将板条箱导入您的rust代码中：
extern crate "rustc-serialize" as rustc_serialize;
use rustc_serialize::base64;
您还应该将#[derive(Encodable)]和更改#[derive(Decodable)]为#[derive(RustcEncodable)]和#[derive(RustcDecodable)]
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