-
Notifications
You must be signed in to change notification settings - Fork 32
/
object-lifetime-default-ambiguous.rs
63 lines (50 loc) · 1.31 KB
/
object-lifetime-default-ambiguous.rs
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
// Test that if a struct declares multiple region bounds for a given
// type parameter, an explicit lifetime bound is required on object
// lifetimes within.
#![allow(dead_code)]
trait Test {
fn foo(&self) { }
}
struct Ref0<T:?Sized> {
r: *mut T
}
struct Ref1<'a,T:'a+?Sized> {
r: &'a T
}
struct Ref2<'a,'b:'a,T:'a+'b+?Sized> {
r: &'a &'b T
}
fn a<'a,'b>(t: Ref2<'a,'b, dyn Test>) {
//~^ ERROR lifetime bound for this object type cannot be deduced from context
}
fn b(t: Ref2<dyn Test>) {
//~^ ERROR lifetime bound for this object type cannot be deduced from context
}
fn c(t: Ref2<&dyn Test>) {
// In this case, the &'a overrides.
}
fn d(t: Ref2<Ref1<dyn Test>>) {
// In this case, the lifetime parameter from the Ref1 overrides.
}
fn e(t: Ref2<Ref0<dyn Test>>) {
// In this case, Ref2 is ambiguous, but Ref0 overrides with 'static.
}
fn f(t: &Ref2<dyn Test>) {
//~^ ERROR lifetime bound for this object type cannot be deduced from context
}
fn main() {
}
// ferrocene-annotations: fls_vhpwge5123cm
// Generic Parameters
//
// ferrocene-annotations: fls_ppd1xwve3tr7
// Raw Pointer Types
//
// ferrocene-annotations: fls_142vncdktbin
// Reference Types
//
// ferrocene-annotations: fls_9ucqbbd0s2yo
// Struct Types
//
// ferrocene-annotations: fls_jeoas4n6su4
// Trait and Lifetime Bounds