Rust/Rocket 无法编译 `state` 和 `pear_codegen`

Question

我开始使用 Rust 和 Rocket。

我正在按照 Rocket Getting Started 的说明进行操作，我得到了 "error: Could not compile state." 完整的日志在这里：`

~/.cargo/bin/cargo run Updating registry https://github.com/rust-lang/crates.io-index Downloading rocket_codegen v0.3.3 Downloading rocket v0.3.3
Compiling gcc v0.3.54 Compiling smallvec v0.4.4 Compiling libc v0.2.34 Compiling version_check v0.1.3 Compiling language-tags v0.2.2 Compiling serde v1.0.23 Compiling state v0.3.2 error[E0554]: #![feature] may not be used on the stable release channel --> /Users/ktenjin/.cargo/registry/src/github.com-1ecc6299db9ec823/state-0.3.2/src/lib.rs:1:1 | 1 | #![feature(const_fn)] | ^^^^^^^^^^^^^^^^^^^^^

error[E0554]: #![feature] may not be used on the stable release channel --> /Users/ktenjin/.cargo/registry/src/github.com-1ecc6299db9ec823/state-0.3.2/src/lib.rs:2:1 | 2 | #![feature(const_unsafe_cell_new)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: #![feature] may not be used on the stable release channel --> /Users/ktenjin/.cargo/registry/src/github.com-1ecc6299db9ec823/state-0.3.2/src/lib.rs:3:1 | 3 | #![feature(const_atomic_usize_new)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: #![feature] may not be used on the stable release channel --> /Users/ktenjin/.cargo/registry/src/github.com-1ecc6299db9ec823/state-0.3.2/src/lib.rs:4:1 | 4 | #![feature(const_atomic_bool_new)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 4 previous errors

error: Could not compile state. warning: build failed, waiting for other jobs to finish... error: build failed

我又运行了，我得到了

error: Could not compile pear_codegen.

我该如何解决这个问题。请帮忙！谢谢！

Answer 1

教程中的rocket tutorial states that you need rust nightly in order to compile it. In order to install nightly, you do as they say in this page他们link：

1. install rustup
2. 做rustup default nightly

这些都在文档中，所以应该很明显。但根据我自己的经验，我经常会错过那些显而易见的事情，因为从一门新语言开始很难，而且你已经跳过了很多障碍，而这些可能只是让你跌跌撞撞的一个障碍。