error[E0375]: implementing `DispatchFromDyn` does not allow multiple fields to be coerced
  --> $DIR/dispatch-from-dyn-zst-transmute.rs:17:1
   |
LL | / impl<'a, T, U> DispatchFromDyn<Foo<'a, U>> for Foo<'a, 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.rs:13:5
   |
LL |     token: IsSendToken<U>,
   |     ^^^^^^^^^^^^^^^^^^^^^
LL |     ptr: &'a U,
   |     ^^^^^^^^^^

error: aborting due to 1 previous error

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