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error[E0309]: the parameter type `Self` may not live long enough
  --> $DIR/async-lifetimes.rs:9:43
   |
LL |     async fn foo(&'a self, key: &'b T) -> (&'a Self, &'b T);
   |                                           ^^^^^^^^^^^^^^^^^
   |
   = help: consider adding an explicit lifetime bound `Self: 'a`...
   = note: ...so that the reference type `&'a Self` does not outlive the data it points at

error[E0309]: the parameter type `T` may not live long enough
  --> $DIR/async-lifetimes.rs:9:43
   |
LL |     async fn foo(&'a self, key: &'b T) -> (&'a Self, &'b T);
   |                                           ^^^^^^^^^^^^^^^^^ ...so that the reference type `&'b T` does not outlive the data it points at
   |
help: consider adding an explicit lifetime bound...
   |
LL | trait MyTrait<'a, 'b, T: 'b> {
   |                        ++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0309`.