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
|
// check-pass
struct CustomEq;
impl Eq for CustomEq {}
impl PartialEq for CustomEq {
fn eq(&self, _: &Self) -> bool {
false
}
}
#[derive(PartialEq, Eq)]
enum Foo {
Bar,
Baz,
Qux(CustomEq),
}
// We know that `BAR_BAZ` will always be `Foo::Bar` and thus eligible for structural matching, but
// dataflow will be more conservative.
const BAR_BAZ: Foo = if 42 == 42 {
Foo::Bar
} else {
Foo::Qux(CustomEq)
};
fn main() {
match Foo::Qux(CustomEq) {
BAR_BAZ => panic!(),
//~^ WARN must be annotated with `#[derive(PartialEq, Eq)]`
//~| NOTE the traits must be derived
//~| NOTE StructuralEq.html for details
//~| WARN this was previously accepted
//~| NOTE see issue #73448
//~| NOTE `#[warn(nontrivial_structural_match)]` on by default
_ => {}
}
}
|
