error[E0375]: implementing `DispatchFromDyn` does not allow multiple fields to be coerced
  --> $DIR/dispatch-from-dyn-zst-transmute-zst-nonzst.rs:17:1
   |
LL | / impl<T, U> DispatchFromDyn<Dispatchable<U, i32>> for Dispatchable<T, ()>
LL | |
LL | | where
LL | |     T: Unsize<U> + ?Sized,
LL | |     U: ?Sized,
   | |______________^
   |
note: the trait `DispatchFromDyn` may only be implemented when a single field is being coerced
  --> $DIR/dispatch-from-dyn-zst-transmute-zst-nonzst.rs:13:5
   |
LL |     _ptr: Box<T>,
   |     ^^^^^^^^^^^^
LL |     z: Z,
   |     ^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0375`.