mirror of https://github.com/rust-lang/rust
51 lines
1.8 KiB
Plaintext
51 lines
1.8 KiB
Plaintext
error[E0261]: use of undeclared lifetime name `'a`
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--> $DIR/issue-67510.rs:5:21
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LL | fn f(x: Box<dyn X<Y<'a> = &'a ()>>) {}
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| ^^ undeclared lifetime
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= note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
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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 ()>>) {}
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| +++++++
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help: consider introducing lifetime `'a` here
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LL | fn f<'a>(x: Box<dyn X<Y<'a> = &'a ()>>) {}
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| ++++
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error[E0261]: use of undeclared lifetime name `'a`
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--> $DIR/issue-67510.rs:5:28
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LL | fn f(x: Box<dyn X<Y<'a> = &'a ()>>) {}
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| ^^ undeclared lifetime
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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 ()>>) {}
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| +++++++
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help: consider introducing lifetime `'a` here
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LL | fn f<'a>(x: Box<dyn X<Y<'a> = &'a ()>>) {}
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| ++++
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error[E0038]: the trait `X` cannot be made into an object
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--> $DIR/issue-67510.rs:5:13
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LL | fn f(x: Box<dyn X<Y<'a> = &'a ()>>) {}
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| ^^^^^^^^^^^^^^^^^^^^^ `X` cannot be made into an object
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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>
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--> $DIR/issue-67510.rs:2:10
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LL | trait X {
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| - this trait cannot be made into an object...
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LL | type Y<'a>;
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| ^ ...because it contains the generic associated type `Y`
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= help: consider moving `Y` to another trait
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0038, E0261.
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For more information about an error, try `rustc --explain E0038`.
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