1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
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());
assert!(err.backtrace().unwrap().is_empty());
assert!(err.backtrace().unwrap().to_string().trim().is_empty());
}
#[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());
assert!(err.backtrace().unwrap().is_empty());
assert!(err.backtrace().unwrap().to_string().trim().is_empty());
}
|
