error: lifetime may not live long enough
  --> $DIR/regions-bounds.rs:9:12
   |
LL | fn a_fn1<'a,'b>(e: TupleStruct<'a>) -> TupleStruct<'b> {
   |          -- -- lifetime `'b` defined here
   |          |
   |          lifetime `'a` defined here
LL |     return e;
   |            ^ returning this value requires that `'a` must outlive `'b`

error: lifetime may not live long enough
  --> $DIR/regions-bounds.rs:13:12
   |
LL | fn a_fn3<'a,'b>(e: Struct<'a>) -> Struct<'b> {
   |          -- -- lifetime `'b` defined here
   |          |
   |          lifetime `'a` defined here
LL |     return e;
   |            ^ returning this value requires that `'a` must outlive `'b`

error: aborting due to 2 previous errors