Facebook 从 Java 到 Rust | Buck 的未来

• https://developers.facebook.com/blog/post/2021/07/01/future-of-buck
• 翻译from rust社区--张汉东

Rust错误处理项目组正在朝着什么方向努力

use std::fmt;

// We have a program that loads a config and expects that
// loading the config will always succeed.
fn main() {
let _config = load_config()
        .expect("config is always valid and exists");
}

// We have a dummy implementation of load_config which
// always errors, since we're just focusing on diagnostics
// here.
fn load_config() -> Result<(), Error> {
Err(Error(SourceError))
}

// And we have an error type that just prints "invalid
// config" and has a source error which just prints "config
// file does not exist"
#[derive(Debug)]
struct Error(SourceError);

impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str("invalid config")
    }
}

impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
Some(&self.0)
    }
}

#[derive(Debug)]
struct SourceError;

impl fmt::Display for SourceError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str("config file does not exist")
    }
}

impl std::error::Error for SourceError {}

$ cargo run
thread 'main' panicked at 'config is always valid and exists: Error(SourceError)', main.rs:4:33
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

$ cargo run
thread 'main' panicked at 'config is always valid and exists', src/main.rs:4:33

Error:
0: invalid config
1: config file does not exist

note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

• https://blog.rust-lang.org/inside-rust/2021/07/01/What-the-error-handling-project-group-is-working-towards.html

在 Rust 中使用'wasmi'轻松托管wasm模块

• https://blog.knoldus.com/hosting-wasm-modules-in-rust-easily-using-wasmi/

RFC 3107 即将被合并 ｜ 允许枚举类型使用

#[derive(Default)]
enum Option<T> {
#[default]
None,
Some(T),
}

• https://github.com/rust-lang/rfcs/pull/3107

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