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
|
error[E0261]: use of undeclared lifetime name `'a`
--> $DIR/issue-67510.rs:5:21
|
LL | fn f(x: Box<dyn X<Y<'a> = &'a ()>>) {}
| ^^ undeclared lifetime
|
= note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
help: consider making the bound lifetime-generic with a new `'a` lifetime
|
LL | fn f(x: Box<dyn for<'a> X<Y<'a> = &'a ()>>) {}
| +++++++
help: consider introducing lifetime `'a` here
|
LL | fn f<'a>(x: Box<dyn X<Y<'a> = &'a ()>>) {}
| ++++
error[E0261]: use of undeclared lifetime name `'a`
--> $DIR/issue-67510.rs:5:28
|
LL | fn f(x: Box<dyn X<Y<'a> = &'a ()>>) {}
| ^^ undeclared lifetime
|
help: consider making the bound lifetime-generic with a new `'a` lifetime
|
LL | fn f(x: Box<dyn for<'a> X<Y<'a> = &'a ()>>) {}
| +++++++
help: consider introducing lifetime `'a` here
|
LL | fn f<'a>(x: Box<dyn X<Y<'a> = &'a ()>>) {}
| ++++
error[E0038]: the trait `X` cannot be made into an object
--> $DIR/issue-67510.rs:5:13
|
LL | fn f(x: Box<dyn X<Y<'a> = &'a ()>>) {}
| ^^^^^^^^^^^^^^^^^^^^^ `X` cannot be made into an object
|
note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/issue-67510.rs:2:10
|
LL | trait X {
| - this trait cannot be made into an object...
LL | type Y<'a>;
| ^ ...because it contains the generic associated type `Y`
= help: consider moving `Y` to another trait
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0038, E0261.
For more information about an error, try `rustc --explain E0038`.
|
