extern crate failure;
#[macro_use]
extern crate failure_derive;
use std::fmt;
use std::io;
use failure::{Backtrace, Fail};
#[derive(Fail, Debug)]
#[fail(display = "An error has occurred: {}", inner)]
struct WrapError {
#[fail(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(#[fail(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 {
#[fail(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(#[fail(cause)] io::Error),
#[fail(display = "An error has occurred: {}", inner)]
Fmt {
#[fail(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());
}