Cargo.toml：

x
[dependencies]
anyhow = "1.0.55"
thiserror = "1.0.35"

src/main.rs：

xxxxxxxxxx
use thiserror::Error;
use anyhow;

#[derive(Debug, Error)]
pub enum MyError {
    #[error("caused by error type one: {0:?}")]
    ErrorTypeOne(String),

    #[error("caused by error type two: reason -> {reason:?}")]
    ErrorTypeTwo {
        reason: String,
    },
}


fn main() {
    let result = my_test_fn();
    println!("error? {}", result.is_err());
    if result.is_err() {
        result.unwrap();
    }
}


fn my_test_fn() -> anyhow::Result<i32> {
    Err(MyError::ErrorTypeTwo { reason: "custom reason".to_string() }.into())
}