| error[E0792]: expected generic lifetime parameter, found `'_` | |
| --> $DIR/impl-fn-predefined-lifetimes.rs:8:9 | |
| | | |
| LL | fn a<'a>() -> impl Fn(&'a u8) -> (impl Debug + '_) { | |
| | -- this generic parameter must be used with a generic lifetime parameter | |
| LL | |x| x | |
| | ^ | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0792`. |