error: lifetime may not live long enough --> $DIR/regions-close-object-into-object-2.rs:9:5 | LL | fn g<'a, T: 'static>(v: Box<dyn A<T> + '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 g<'a, T: 'static>(v: Box<dyn A<T> + 'a>) -> Box<dyn X + 'a> { | ~~ help: alternatively, add an explicit `'static` bound to this reference | LL | fn g<'a, T: 'static>(v: Box<(dyn A<T> + 'static)>) -> Box<dyn X + 'static> { | ~~~~~~~~~~~~~~~~~~~~~~~~~ error[E0515]: cannot return value referencing local data `*v` --> $DIR/regions-close-object-into-object-2.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: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0515`.