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error[E0261]: use of undeclared lifetime name `'a`
--> $DIR/issue-67510.rs:5:21
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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
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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
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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
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LL | fn f(x: Box<dyn X<Y<'a> = &'a ()>>) {}
| ^^^^^^^^^^^^^^^^^^^^^ `X` cannot be made into an object
|
note: for a trait to be "object safe" 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
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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`.
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