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error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/issue-38604.rs:24:13
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LL | let _f: Box<Foo> = //~ ERROR `Foo` cannot be made into an object
| ^^^^^^^^ the trait `Foo` cannot be made into an object
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= note: the trait cannot use `Self` as a type parameter in the supertraits or where-clauses
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/issue-38604.rs:25:9
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LL | Box::new(()); //~ ERROR `Foo` cannot be made into an object
| ^^^^^^^^^^^^ the trait `Foo` cannot be made into an object
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= note: the trait cannot use `Self` as a type parameter in the supertraits or where-clauses
= note: required because of the requirements on the impl of `std::ops::CoerceUnsized<std::boxed::Box<dyn Foo>>` for `std::boxed::Box<()>`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0038`.
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