+warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> $DIR/no-unsize-coerce-dyn-trait.rs:1:12
+ |
+LL | #![feature(dyn_star, trait_upcasting)]
+ | ^^^^^^^^
+ |
+ = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
+ = note: `#[warn(incomplete_features)]` on by default
+
+error[E0308]: mismatched types
+ --> $DIR/no-unsize-coerce-dyn-trait.rs:11:26
+ |
+LL | let y: Box<dyn* B> = x;
+ | ----------- ^ expected trait `B`, found trait `A`
+ | |
+ | expected due to this
+ |
+ = note: expected struct `Box<dyn* B>`
+ found struct `Box<dyn* A>`
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0308`.