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
|
// This file tests the exhaustiveness algorithm on opaque constants. Most of the examples give
// unnecessary warnings because const_to_pat.rs converts a constant pattern to a wildcard when the
// constant is not allowed as a pattern. This is an edge case so we may not care to fix it.
// See also https://github.com/rust-lang/rust/issues/78057
#![deny(unreachable_patterns)]
#[derive(PartialEq)]
struct Foo(i32);
impl Eq for Foo {}
const FOO: Foo = Foo(42);
const FOO_REF: &Foo = &Foo(42);
const FOO_REF_REF: &&Foo = &&Foo(42);
#[derive(PartialEq)]
struct Bar;
impl Eq for Bar {}
const BAR: Bar = Bar;
#[derive(PartialEq)]
enum Baz {
Baz1,
Baz2
}
impl Eq for Baz {}
const BAZ: Baz = Baz::Baz1;
fn main() {
match FOO {
FOO => {}
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
_ => {} // should not be emitting unreachable warning
//~^ ERROR unreachable pattern
}
match FOO_REF {
FOO_REF => {}
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
Foo(_) => {} // should not be emitting unreachable warning
//~^ ERROR unreachable pattern
}
// This used to cause an ICE (https://github.com/rust-lang/rust/issues/78071)
match FOO_REF_REF {
FOO_REF_REF => {}
//~^ WARNING must be annotated with `#[derive(PartialEq, Eq)]`
//~| WARNING this was previously accepted by the compiler but is being phased out
Foo(_) => {}
}
match BAR {
Bar => {}
BAR => {} // should not be emitting unreachable warning
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
//~| ERROR unreachable pattern
_ => {}
//~^ ERROR unreachable pattern
}
match BAR {
BAR => {}
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
Bar => {} // should not be emitting unreachable warning
//~^ ERROR unreachable pattern
_ => {}
//~^ ERROR unreachable pattern
}
match BAR {
BAR => {}
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
BAR => {} // should not be emitting unreachable warning
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
//~| ERROR unreachable pattern
_ => {} // should not be emitting unreachable warning
//~^ ERROR unreachable pattern
}
match BAZ {
BAZ => {}
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
Baz::Baz1 => {} // should not be emitting unreachable warning
//~^ ERROR unreachable pattern
_ => {}
//~^ ERROR unreachable pattern
}
match BAZ {
Baz::Baz1 => {}
BAZ => {}
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
_ => {}
//~^ ERROR unreachable pattern
}
match BAZ {
BAZ => {}
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
Baz::Baz2 => {} // should not be emitting unreachable warning
//~^ ERROR unreachable pattern
_ => {} // should not be emitting unreachable warning
//~^ ERROR unreachable pattern
}
type Quux = fn(usize, usize) -> usize;
fn quux(a: usize, b: usize) -> usize { a + b }
const QUUX: Quux = quux;
match QUUX {
QUUX => {}
QUUX => {}
_ => {}
}
#[derive(PartialEq, Eq)]
struct Wrap<T>(T);
const WRAPQUUX: Wrap<Quux> = Wrap(quux);
match WRAPQUUX {
WRAPQUUX => {}
WRAPQUUX => {}
Wrap(_) => {}
}
match WRAPQUUX {
Wrap(_) => {}
WRAPQUUX => {} // detected unreachable because we do inspect the `Wrap` layer
//~^ ERROR unreachable pattern
}
#[derive(PartialEq, Eq)]
enum WhoKnows<T> {
Yay(T),
Nope,
};
const WHOKNOWSQUUX: WhoKnows<Quux> = WhoKnows::Yay(quux);
match WHOKNOWSQUUX {
WHOKNOWSQUUX => {}
WhoKnows::Yay(_) => {}
WHOKNOWSQUUX => {} // detected unreachable because we do inspect the `WhoKnows` layer
//~^ ERROR unreachable pattern
WhoKnows::Nope => {}
}
}
|
