| error[E0792]: expected generic type parameter, found `impl Foo` |
| --> $DIR/double-wrap-with-defining-use.rs:7:26 |
| | |
| LL | fn a(x: impl Foo) -> impl Foo { |
| | -------- this generic parameter must be used with a generic type parameter |
| LL | if true { x } else { a(a(x)) } |
| | ^^^^^^^ |
| |
| error: type parameter `impl Foo` is part of concrete type but not used in parameter list for the `impl Trait` type alias |
| --> $DIR/double-wrap-with-defining-use.rs:7:26 |
| | |
| LL | if true { x } else { a(a(x)) } |
| | ^^^^^^^ |
| |
| error: aborting due to 2 previous errors |
| |
| For more information about this error, try `rustc --explain E0792`. |
