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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
#![allow(clippy::needless_late_init)]
use std::fmt::{self, Debug, Display};
use thiserror::Error;
pub struct NoFormat;
#[derive(Debug)]
pub struct DebugOnly;
pub struct DisplayOnly;
impl Display for DisplayOnly {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("display only")
}
}
#[derive(Debug)]
pub struct DebugAndDisplay;
impl Display for DebugAndDisplay {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("debug and display")
}
}
// Should expand to:
//
// impl<E> Display for EnumDebugField<E>
// where
// E: Debug;
//
// impl<E> Error for EnumDebugField<E>
// where
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub enum EnumDebugGeneric<E> {
#[error("{0:?}")]
FatalError(E),
}
// Should expand to:
//
// impl<E> Display for EnumFromGeneric<E>;
//
// impl<E> Error for EnumFromGeneric<E>
// where
// EnumDebugGeneric<E>: Error + 'static,
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub enum EnumFromGeneric<E> {
#[error("enum from generic")]
Source(#[from] EnumDebugGeneric<E>),
}
// Should expand to:
//
// impl<HasDisplay, HasDebug, HasNeither> Display
// for EnumCompound<HasDisplay, HasDebug, HasNeither>
// where
// HasDisplay: Display,
// HasDebug: Debug;
//
// impl<HasDisplay, HasDebug, HasNeither> Error
// for EnumCompound<HasDisplay, HasDebug, HasNeither>
// where
// Self: Debug + Display;
//
#[derive(Error)]
pub enum EnumCompound<HasDisplay, HasDebug, HasNeither> {
#[error("{0} {1:?}")]
DisplayDebug(HasDisplay, HasDebug),
#[error("{0}")]
Display(HasDisplay, HasNeither),
#[error("{1:?}")]
Debug(HasNeither, HasDebug),
}
impl<HasDisplay, HasDebug, HasNeither> Debug for EnumCompound<HasDisplay, HasDebug, HasNeither> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("EnumCompound")
}
}
#[test]
fn test_display_enum_compound() {
let mut instance: EnumCompound<DisplayOnly, DebugOnly, NoFormat>;
instance = EnumCompound::DisplayDebug(DisplayOnly, DebugOnly);
assert_eq!(format!("{}", instance), "display only DebugOnly");
instance = EnumCompound::Display(DisplayOnly, NoFormat);
assert_eq!(format!("{}", instance), "display only");
instance = EnumCompound::Debug(NoFormat, DebugOnly);
assert_eq!(format!("{}", instance), "DebugOnly");
}
// Should expand to:
//
// impl<E> Display for EnumTransparentGeneric<E>
// where
// E: Display;
//
// impl<E> Error for EnumTransparentGeneric<E>
// where
// E: Error,
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub enum EnumTransparentGeneric<E> {
#[error(transparent)]
Other(E),
}
// Should expand to:
//
// impl<E> Display for StructDebugGeneric<E>
// where
// E: Debug;
//
// impl<E> Error for StructDebugGeneric<E>
// where
// Self: Debug + Display;
//
#[derive(Error, Debug)]
#[error("{underlying:?}")]
pub struct StructDebugGeneric<E> {
pub underlying: E,
}
// Should expand to:
//
// impl<E> Error for StructFromGeneric<E>
// where
// StructDebugGeneric<E>: Error + 'static,
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub struct StructFromGeneric<E> {
#[from]
pub source: StructDebugGeneric<E>,
}
// Should expand to:
//
// impl<E> Display for StructTransparentGeneric<E>
// where
// E: Display;
//
// impl<E> Error for StructTransparentGeneric<E>
// where
// E: Error,
// Self: Debug + Display;
//
#[derive(Error, Debug)]
#[error(transparent)]
pub struct StructTransparentGeneric<E>(E);
|
