// Read environment variable, panic if it is not present let path = std::env::var("IMPORTANT_PATH").unwrap(); In the "expect as error message" style we would use expect to describe that the environment variable was not set when it should have been: 代码语言:javascript 代码运行次数:...
use std::fs::read_to_string; #[derive(thiserror::Error, Debug)] enum MyCustomError { #[error("环境变量不存在")] EnvironmentVariableNotFound(#[from] std::env::VarError), #[error(transparent)] IOError(#[from] std::io::Error), } // 方法里可能会发生VarError或std::io::Error错误,...
运行结果: thread'main'panicked at'error occured',src\main.rs:3:5note:runwith`RUST_BACKTRACE=1`environment variable to display a backtrace. 很显然,程序并不能如约运行到 println!("Hello, Rust") ,而是在 panic! 宏被调用时停止了运行。 不可恢复的错误一定会导致程序受到致命的打击而终止运行。 让...
;println!("{}", html);Ok(())}fn render() -> Result<String, MyError> {let file = std::env::var("MARKDOWN")?;let source = read_to_string(file)?;Ok(source)}#[derive(thiserror::Error, Debug)]enum MyError {#[error("Environment variable not found")]EnvironmentVariableNot...
panicked at src/main.rs:3:38:// called `Result::unwrap()` on an `Err` value: FromUtf8Error { bytes: [72, 101, 108, 108, 255, 255], error: Utf8Error { valid_up_to: 4, error_len: Some(1) } }// note: run with `RUST_BACKTRACE=1` environment variable to display a ...
note: run withRUST_BACKTRACE=1environment variable to display a backtracepanic reover: Err( Any { .. }, ) exit ok! ### 2.1 使用 `panic!` 的 backtrace可以使用 `RUST_BACKTRACE=1 cargo run` 来得到一个 backtrace,backtrace 是一个执行到目前位置所有被调用的函数的列表。Rust 的 backtrace 跟其...
thread'main'panicked at'crash',src/main.rs:8:5note:runwith`RUST_BACKTRACE=1`environment variable to display a backtrace 它告诉我们,main 函数所在的线程崩溃了,发生的代码位置是 src/main.rs 中的第 8 行第 5 个字符(去除该行前面的空字符) ...
RUST_SRC_PATH environment variable must be set to point to the src directory of a rust checkout. E.g. "/home/foouser/src/rust/src" Racer Error: 是因为安装racer步骤不完整, 需要将rust源码中src拷贝到rust安装目录中,然后设置环境变量
thread'main'panickedat'library/core/src/panicking.rs:220:5:unsafeprecondition(s)violated:slice::from_raw_partsrequiresthepointertobealignedandnon-null,andthetotalsizeoftheslicenottoexceed`isize::MAX`',note:runwith`RUST_BACKTRACE=1`environmentvariabletodisplayabacktrace ...
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', src/main.rs:4:37note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace ...