--- /dev/null
+error: at least one trait must be specified
+ --> $DIR/generic_not_used.rs:8:33
+ |
+LL | type WrongGeneric<T: 'static> = impl 'static;
+ | ^^^^^^^^^^^^
+
+warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> $DIR/generic_not_used.rs:3:32
+ |
+LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
+ | ^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `#[warn(incomplete_features)]` on by default
+ = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
+
+error: type parameter `V` is part of concrete type but not used in parameter list for the `impl Trait` type alias
+ --> $DIR/generic_not_used.rs:11:73
+ |
+LL | fn wrong_generic<U: 'static, V: 'static>(_: U, v: V) -> WrongGeneric<U> {
+ | _________________________________________________________________________^
+LL | |
+LL | | v
+LL | | }
+ | |_^
+
+error: aborting due to 2 previous errors; 1 warning emitted
+