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error[E0261]: use of undeclared lifetime name `'x`
--> $DIR/gat-in-trait-path-undeclared-lifetime.rs:6:35
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LL | fn _f(arg : Box<dyn for<'a> X<Y<'x> = &'a [u32]>>) {}
| ^^ undeclared lifetime
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= 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 `'x` lifetime
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LL | fn _f(arg : Box<dyn for<'x, 'a> X<Y<'x> = &'a [u32]>>) {}
| +++
help: consider introducing lifetime `'x` here
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LL | fn _f<'x>(arg : Box<dyn for<'a> X<Y<'x> = &'a [u32]>>) {}
| ++++
error[E0582]: binding for associated type `Y` references lifetime `'a`, which does not appear in the trait input types
--> $DIR/gat-in-trait-path-undeclared-lifetime.rs:6:33
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LL | fn _f(arg : Box<dyn for<'a> X<Y<'x> = &'a [u32]>>) {}
| ^^^^^^^^^^^^^^^^^
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0261, E0582.
For more information about an error, try `rustc --explain E0261`.
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