error[E0310]: the parameter type `U` may not live long enough
  --> $DIR/regions-close-object-into-object-4.rs:9:5
   |
LL |     Box::new(B(&*v)) as Box<dyn X>
   |     ^^^^^^^^
   |     |
   |     the parameter type `U` must be valid for the static lifetime...
   |     ...so that the type `U` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL | fn i<'a, T, U: 'static>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {
   |              +++++++++

error[E0310]: the parameter type `U` may not live long enough
  --> $DIR/regions-close-object-into-object-4.rs:9:5
   |
LL |     Box::new(B(&*v)) as Box<dyn X>
   |     ^^^^^^^^^^^^^^^^
   |     |
   |     the parameter type `U` must be valid for the static lifetime...
   |     ...so that the type `U` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL | fn i<'a, T, U: 'static>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {
   |              +++++++++

error[E0310]: the parameter type `U` may not live long enough
  --> $DIR/regions-close-object-into-object-4.rs:9:5
   |
LL |     Box::new(B(&*v)) as Box<dyn X>
   |     ^^^^^^^^^^^^^^^^
   |     |
   |     the parameter type `U` must be valid for the static lifetime...
   |     ...so that the type `U` will meet its required lifetime bounds
   |
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
help: consider adding an explicit lifetime bound
   |
LL | fn i<'a, T, U: 'static>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {
   |              +++++++++

error: lifetime may not live long enough
  --> $DIR/regions-close-object-into-object-4.rs:9:5
   |
LL | fn i<'a, T, U>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {
   |      -- lifetime `'a` defined here
LL |     Box::new(B(&*v)) as Box<dyn X>
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
   |
help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `v`
   |
LL | fn i<'a, T, U>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'a> {
   |                                                    ~~
help: alternatively, add an explicit `'static` bound to this reference
   |
LL | fn i<'a, T, U>(v: Box<(dyn A<U> + 'static)>) -> Box<dyn X + 'static> {
   |                   ~~~~~~~~~~~~~~~~~~~~~~~~~

error[E0515]: cannot return value referencing local data `*v`
  --> $DIR/regions-close-object-into-object-4.rs:9:5
   |
LL |     Box::new(B(&*v)) as Box<dyn X>
   |     ^^^^^^^^^^^---^^^^^^^^^^^^^^^^
   |     |          |
   |     |          `*v` is borrowed here
   |     returns a value referencing data owned by the current function

error[E0310]: the parameter type `U` may not live long enough
  --> $DIR/regions-close-object-into-object-4.rs:9:14
   |
LL |     Box::new(B(&*v)) as Box<dyn X>
   |              ^^^^^^
   |              |
   |              the parameter type `U` must be valid for the static lifetime...
   |              ...so that the type `U` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL | fn i<'a, T, U: 'static>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {
   |              +++++++++

error: aborting due to 6 previous errors

Some errors have detailed explanations: E0310, E0515.
For more information about an error, try `rustc --explain E0310`.