cargo 使用国内源镜像，引用 substrate 的 Contracts Pallet Crate 编译错误

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问题

1. cargo 编译很慢

2. 学习 https://substrate.dev/docs/en/tutorials/add-contracts-pallet/ 时，编译报错

    ...pallet-contracts v3.0.0error[E0308]: mismatched types--> /home/dhbm/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-df7c3c540f42cdbd/pallet-contracts-3.0.0/src/exec.rs:802:30|802 |         <T as Config>::Event::from(event).into(),|                                    ^^^^^ expected associated type, found enum `pallet::Event`|= note: expected associated type `<T as frame_system::Config>::Event`found enum `pallet::Event<T>`= help: consider constraining the associated type `<T as frame_system::Config>::Event` to `pallet::Event<T>` or calling a method that returns `<T as frame_system::Config>::Event`= note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.htmlerror: aborting due to previous error...
   

解决方案

当前使用的是 清华 源镜像，重新找了

https://cargo.budshome.com/reference/source-replacement.html

这里的脚本，挨个切换

$ cd ~/.cargo
$ cat config

[source.crates-io]
registry = "https://github.com/rust-lang/crates.io-index"# 指定镜像
# replace-with = '镜像源名' # 如：tuna、sjtu、ustc，或者 rustcc
# replace-with = 'ustc'
# replace-with = 'tuna'
# replace-with = 'sjtu'
# replace-with = 'rustcc'# 以下列举了 4 个 可用源，可以自行选用其中一个，注释掉以上对应的 replace-with
# 20210427 这个 ustc 怎么不能用呢 
# 中国科学技术大学
[source.ustc]
registry = "https://mirrors.ustc.edu.cn/crates.io-index"
# >>> 或者 <<<
# registry = "git://mirrors.ustc.edu.cn/crates.io-index"# 上海交通大学
[source.sjtu]
registry = "https://mirrors.sjtug.sjtu.edu.cn/git/crates.io-index/"# 清华大学
[source.tuna]
registry = "https://mirrors.tuna.tsinghua.edu.cn/git/crates.io-index.git"# rustcc社区
[source.rustcc]
registry = "https://code.aliyun.com/rustcc/crates.io-index.git"

错误处理

1. 以前遇到过的

      Downloaded block-padding v0.1.5 (registry `git://mirrors.ustc.edu.cn/crates.io-index`)Downloaded bs58 v0.3.1 (registry `git://mirrors.ustc.edu.cn/crates.io-index`)error: failed to download from `https://crates-io.proxy.ustclug.org/api/v1/crates/globset/0.4.5/download`
   

2. 今天遇到的错误

   …
   error[E0308]: mismatched types
   –> /home/dhbm/.cargo/registry/src/mirrors.sjtug.sjtu.edu.cn-4f7dbcce21e258a2/pallet-contracts-3.0.0/src/exec.rs:802:30
   |
   802 | ::Event::from(event).into(),
   | ^^^^^ expected associated type, found enum pallet::Event
   |
   = note: expected associated type <T as frame_system::Config>::Event
   found enum pallet::Event<T>
   = help: consider constraining the associated type <T as frame_system::Config>::Event to pallet::Event<T> or calling a method that returns <T as frame_system::Config>::Event
   = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html

   error: aborting due to previous error
   …

解决错误

1. 分别切换了 tuna ， sjtu ， ustc ，都是一样的错误
   可能国内源还没有同步下来，只好改回原始的 source.crates-io （注释掉所有的 replace-with）

   漫长等待之后。还是这个错误啊！

   那么还是换回去 tuna 源镜像
   ** 切换源镜像无需重启

2. 切换一下 rustc 缺省版本

   $ rustup default nightly-2021-04-15-x86_64-unknown-linux-gnu

    info: using existing install for 'nightly-2021-04-15-x86_64-unknown-linux-gnu'info: default toolchain set to 'nightly-2021-04-15-x86_64-unknown-linux-gnu'nightly-2021-04-15-x86_64-unknown-linux-gnu unchanged - rustc 1.53.0-nightly (16bf626a3 2021-04-14
   

   切换之前
   cargo --version

    cargo 1.48.0-nightly (75615f8e6 2020-09-29)
   

   现在
   $ cargo --version

    cargo 1.53.0-nightly (65d57e6f3 2021-04-04)
   

   3. 改回 tuna 源镜像，重新编译，终于 ok！

   $ cargo build --release

   Compiling node-template v3.0.0 (/home/dhbm/3.0.2/substrate-node-template/node)Building [=======================> ] 917/919: node-template 
   

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