tests/ui/feature-gates/feature-gate-trait_upcasting.stderr

   1 error[E0658]: cannot cast `dyn Bar` to `dyn Foo`, trait upcasting coercion is experimental
   2   --> $DIR/feature-gate-trait_upcasting.rs:11:25
   3    |
   4 LL |     let foo: &dyn Foo = bar;
   5    |                         ^^^
   6    |
   7    = note: see issue #65991 <https://github.com/rust-lang/rust/issues/65991> for more information
   8    = help: add `#![feature(trait_upcasting)]` to the crate attributes to enable
   9    = note: required when coercing `&dyn Bar` into `&dyn Foo`
  10
  11 error: aborting due to previous error
  12
  13 For more information about this error, try `rustc --explain E0658`.