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error[E0375]: implementing the trait `CoerceUnsized` requires multiple coercions
  --> $DIR/issue-26905.rs:16:40
   |
LL | impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<MyRc<U>> for MyRc<T>{ }
   |                                        ^^^^^^^^^^^^^^^^^^^^^^ requires multiple coercions
   |
   = note: `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced
   = note: currently, 2 fields need coercions: `_ptr` (`*const T` to `*const U`), `_boo` (`NotPhantomData<T>` to `NotPhantomData<U>`)

error: aborting due to previous error

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