error[E0412]: cannot find type `T` in this scope
  --> $DIR/transmute-to-tail-with-err.rs:3:26
   |
LL | struct Bar(Box<dyn Trait<T>>);
   |                          ^ not found in this scope
   |
help: you might be missing a type parameter
   |
LL | struct Bar<T>(Box<dyn Trait<T>>);
   |           +++

error: aborting due to previous error

For more information about this error, try `rustc --explain E0412`.