warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/generic_duplicate_lifetime_param.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: non-defining opaque type use in defining scope
  --> $DIR/generic_duplicate_lifetime_param.rs:10:26
   |
LL | fn one<'a>(t: &'a ()) -> Two<'a, 'a> {
   |                          ^^^^^^^^^^^
   |
note: lifetime used multiple times
  --> $DIR/generic_duplicate_lifetime_param.rs:8:10
   |
LL | type Two<'a, 'b> = impl std::fmt::Debug;
   |          ^^  ^^

error: aborting due to previous error; 1 warning emitted