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error[E0375]: implementing the trait `CoerceUnsized` requires multiple coercions
--> $DIR/E0375.rs:10:12
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LL | impl<T, U> CoerceUnsized<Foo<U, T>> for Foo<T, U> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^ requires multiple coercions
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= note: `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced
= note: currently, 2 fields need coercions: `b` (`T` to `U`), `c` (`U` to `T`)
error: aborting due to previous error
For more information about this error, try `rustc --explain E0375`.
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