error[E0309]: the parameter type `T` may not live long enough
  --> $DIR/projection-where-clause-none.rs:14:5
   |
LL | fn foo<'a, T>() -> &'a ()
   |        -- the parameter type `T` must be valid for the lifetime `'a` as defined here...
...
LL |     bar::<T::Output>()
   |     ^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL |     T: MyTrait<'a> + 'a,
   |                    ++++

error: aborting due to 1 previous error

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