tests/ui/type-alias-impl-trait/declared_but_never_defined.stderr


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error: unconstrained opaque type
  --> $DIR/declared_but_never_defined.rs:6:12
   |
LL | type Bar = impl std::fmt::Debug;
   |            ^^^^^^^^^^^^^^^^^^^^
   |
   = note: `Bar` must be used in combination with a concrete type within the same module

error: aborting due to previous error