[rustc.git] / vendor / failure / examples / simple.rs

#[macro_use]
extern crate failure;

use failure::Fail;

#[derive(Debug, Fail)]
#[fail(display = "my error")]
struct MyError;

#[derive(Debug, Fail)]
#[fail(display = "my wrapping error")]
struct WrappingError(#[fail(cause)] MyError);

fn bad_function() -> Result<(), WrappingError> {
    Err(WrappingError(MyError))
}

fn main() {
    for cause in Fail::iter_chain(&bad_function().unwrap_err()) {
        println!("{}: {}", cause.name().unwrap_or("Error"), cause);
    }
}
Commit	Line	Data
8faf50e0 XL	1	#[macro_use]
	2	extern crate failure;
	3
	4	use failure::Fail;
	5
	6	#[derive(Debug, Fail)]
	7	#[fail(display = "my error")]
	8	struct MyError;
	9
	10	#[derive(Debug, Fail)]
	11	#[fail(display = "my wrapping error")]
	12	struct WrappingError(#[fail(cause)] MyError);
	13
	14	fn bad_function() -> Result<(), WrappingError> {
	15	Err(WrappingError(MyError))
	16	}
	17
	18	fn main() {
9fa01778 XL	19	for cause in Fail::iter_chain(&bad_function().unwrap_err()) {
9fa01778 XL	20	println!("{}: {}", cause.name().unwrap_or("Error"), cause);
8faf50e0 XL	21	}
8faf50e0 XL	22	}