blob: c5c943ec945f4c81df9d7bbc9878dccd1ee2b5a8 [file] [log] [blame]
extern crate failure;
#[macro_use] extern crate failure_derive;
use std::io;
use std::fmt;
use failure::{Backtrace, Fail};
#[derive(Fail, Debug)]
#[fail(display = "An error has occurred: {}", inner)]
struct WrapError {
#[cause] inner: io::Error,
}
#[test]
fn wrap_error() {
let inner = io::Error::from_raw_os_error(98);
let err = WrapError { inner };
assert!(err.cause().and_then(|err| err.downcast_ref::<io::Error>()).is_some());
}
#[derive(Fail, Debug)]
#[fail(display = "An error has occurred: {}", _0)]
struct WrapTupleError(#[cause] io::Error);
#[test]
fn wrap_tuple_error() {
let io_error = io::Error::from_raw_os_error(98);
let err: WrapTupleError = WrapTupleError(io_error);
assert!(err.cause().and_then(|err| err.downcast_ref::<io::Error>()).is_some());
}
#[derive(Fail, Debug)]
#[fail(display = "An error has occurred: {}", inner)]
struct WrapBacktraceError {
#[cause] inner: io::Error,
backtrace: Backtrace,
}
#[test]
fn wrap_backtrace_error() {
let inner = io::Error::from_raw_os_error(98);
let err: WrapBacktraceError = WrapBacktraceError { inner, backtrace: Backtrace::new() };
assert!(err.cause().and_then(|err| err.downcast_ref::<io::Error>()).is_some());
assert!(err.backtrace().is_some());
}
#[derive(Fail, Debug)]
enum WrapEnumError {
#[fail(display = "An error has occurred: {}", _0)]
Io(#[cause] io::Error),
#[fail(display = "An error has occurred: {}", inner)]
Fmt {
#[cause] inner: fmt::Error,
backtrace: Backtrace,
},
}
#[test]
fn wrap_enum_error() {
let io_error = io::Error::from_raw_os_error(98);
let err: WrapEnumError = WrapEnumError::Io(io_error);
assert!(err.cause().and_then(|err| err.downcast_ref::<io::Error>()).is_some());
assert!(err.backtrace().is_none());
let fmt_error = fmt::Error::default();
let err: WrapEnumError = WrapEnumError::Fmt { inner: fmt_error, backtrace: Backtrace::new() };
assert!(err.cause().and_then(|err| err.downcast_ref::<fmt::Error>()).is_some());
assert!(err.backtrace().is_some());
}