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error: non-defining opaque type use in defining scope
  --> $DIR/generic_duplicate_lifetime_param.rs:7:26
   |
LL | fn one<'a>(t: &'a ()) -> Two<'a, 'a> {
   |                          ^^^^^^^^^^^ generic argument `'a` used twice
   |
note: for this opaque type
  --> $DIR/generic_duplicate_lifetime_param.rs:5:20
   |
LL | type Two<'a, 'b> = impl std::fmt::Debug;
   |                    ^^^^^^^^^^^^^^^^^^^^

error: non-defining opaque type use in defining scope
  --> $DIR/generic_duplicate_lifetime_param.rs:9:5
   |
LL |     t
   |     ^
   |
note: lifetime used multiple times
  --> $DIR/generic_duplicate_lifetime_param.rs:5:10
   |
LL | type Two<'a, 'b> = impl std::fmt::Debug;
   |          ^^  ^^

error: aborting due to 2 previous errors