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error[E0658]: cannot cast `dyn A` to `dyn B`, trait upcasting coercion is experimental
--> $DIR/upcast-through-struct-tail.rs:10:5
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LL | x
| ^
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= note: see issue #65991 <https://github.com/rust-lang/rust/issues/65991> for more information
= help: add `#![feature(trait_upcasting)]` to the crate attributes to enable
= note: required when coercing `Box<Wrapper<(dyn A + 'a)>>` into `Box<Wrapper<(dyn B + 'a)>>`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
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