1error[E0261]: use of undeclared lifetime name `'x` 2 --> $DIR/gat-in-trait-path-undeclared-lifetime.rs:8:35 3 | 4LL | fn _f(arg : Box<dyn for<'a> X<Y<'x> = &'a [u32]>>) {} 5 | - ^^ undeclared lifetime 6 | | 7 | help: consider introducing lifetime `'x` here: `<'x>` 8 | 9 = help: if you want to experiment with in-band lifetime bindings, add `#![feature(in_band_lifetimes)]` to the crate attributes 10 11error[E0582]: binding for associated type `Y` references lifetime `'a`, which does not appear in the trait input types 12 --> $DIR/gat-in-trait-path-undeclared-lifetime.rs:8:33 13 | 14LL | fn _f(arg : Box<dyn for<'a> X<Y<'x> = &'a [u32]>>) {} 15 | ^^^^^^^^^^^^^^^^^ 16 17error: aborting due to 2 previous errors 18 19Some errors have detailed explanations: E0261, E0582. 20For more information about an error, try `rustc --explain E0261`. 21