error: lifetime may not live long enough
  --> $DIR/ret-impl-trait-one.rs:12:80
   |
LL |   async fn async_ret_impl_trait1<'a, 'b>(a: &'a u8, b: &'b u8) -> impl Trait<'a> {
   |  ________________________________--__--__________________________________________^
   | |                                |   |
   | |                                |   lifetime `'b` defined here
   | |                                lifetime `'a` defined here
LL | |
LL | |     (a, b)
LL | | }
   | |_^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b`

error: aborting due to previous error