error[E0495]: cannot infer an appropriate lifetime for borrow expression due to conflicting requirements
  --> $DIR/regions-close-object-into-object-2.rs:10:11
   |
LL |     box B(&*v) as Box<X> //~ ERROR cannot infer
   |           ^^^
   |
note: first, the lifetime cannot outlive the lifetime 'a as defined on the function body at 9:6...
  --> $DIR/regions-close-object-into-object-2.rs:9:6
   |
LL | fn g<'a, T: 'static>(v: Box<A<T>+'a>) -> Box<X+'static> {
   |      ^^
note: ...so that the type `(dyn A<T> + 'a)` is not borrowed for too long
  --> $DIR/regions-close-object-into-object-2.rs:10:11
   |
LL |     box B(&*v) as Box<X> //~ ERROR cannot infer
   |           ^^^
   = note: but, the lifetime must be valid for the static lifetime...
   = note: ...so that the expression is assignable:
           expected std::boxed::Box<(dyn X + 'static)>
              found std::boxed::Box<dyn X>

error: aborting due to previous error

For more information about this error, try `rustc --explain E0495`.