如何知道哪个包 Rust 编译失败?

How to know which package failed Rust compilation?

我的 Cargo.toml 中有编译失败的依赖项(因为使用了太新的语言特性)。

我正在尝试通过降低依赖包版本来解决问题。

但是尝试这样做,我也很难理解我需要降低谁的包的版本:

这是我的 Cargo.toml:

[package]
name = "..."
version = "0.1.0"
authors = ["..."]
edition = "2018"

[dependencies]
tokio = { version = "<0.3.0", features = ["macros", "sync"] }
warp = ">=0.0.0"
...
   Compiling socket2 v0.4.0
     Running `rustc --crate-name socket2 --edition=2018 /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/socket2-0.4.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 -C metadata=d227fc33c8864b39 -C extra-filename=-d227fc33c8864b39 --out-dir /home/user/Projects/GoldFever/exchange-server-rust/target/debug/deps -L dependency=/home/user/Projects/GoldFever/exchange-server-rust/target/debug/deps --extern libc=/home/user/Projects/GoldFever/exchange-server-rust/target/debug/deps/liblibc-f603594c75a963a0.rmeta --cap-lints allow`
error[E0658]: `match` is not allowed in a `const fn`
   --> /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/socket2-0.4.0/src/lib.rs:156:9
    |
156 | /         match address {
157 | |             SocketAddr::V4(_) => Domain::IPV4,
158 | |             SocketAddr::V6(_) => Domain::IPV6,
159 | |         }
    | |_________^
    |
    = note: for more information, see https://github.com/rust-lang/rust/issues/49146

我不明白是哪个包依赖链导致了这个编译错误:

为什么要编译socket2 v0.4.0?我不知道哪个包需要它。我想查看导致 socket2 的依赖链,以了解要降低哪个包的版本以使其编译。

如果我尝试写:

socket2 = "<0.4.0"

不会阻止cargo构建socket2 v0.4.0。因此,它通过 Cargo.toml 中某物的依赖链构建。我认为在实践中没有足够简单的方法来查看完整链。

理想情况下,我想要一个程序,它会自动尝试减少已用软件包的版本,直到它变得可编译为止。那么?

Why was socket2 v0.4.0 compiled? I don't know which package requires it. I want to see the chain of dependencies that led to socket2 to know whose package's version to lower to make it compile.

这可以通过 运行 cargo tree -i socket2 (you may have to install the subcommand separately 在较旧的工具链上看到),对我来说看起来像这样:

socket2 v0.4.0
└── hyper v0.14.7
    └── warp v0.3.1
        └── tests v0.1.0 (C:\Users\kmdreko\Projects\rust-tests)

您可以尝试 warp = "0.2" 而不是 "0.3"