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error[E0277]: the size for values of type `T` cannot be known at compilation time
--> $DIR/unsized-enum.rs:6:36
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LL | fn foo2<T: ?Sized>() { not_sized::<Foo<T>>() }
| - ^^^^^^ doesn't have a size known at compile-time
| |
| this type parameter needs to be `std::marker::Sized`
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note: required by a bound in `Foo`
--> $DIR/unsized-enum.rs:4:10
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LL | enum Foo<U> { FooSome(U), FooNone }
| ^ required by this bound in `Foo`
help: you could relax the implicit `Sized` bound on `U` if it were used through indirection like `&U` or `Box<U>`
--> $DIR/unsized-enum.rs:4:10
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LL | enum Foo<U> { FooSome(U), FooNone }
| ^ - ...if indirection were used here: `Box<U>`
| |
| this could be changed to `U: ?Sized`...
help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn foo2<T: ?Sized>() { not_sized::<Foo<T>>() }
LL + fn foo2<T>() { not_sized::<Foo<T>>() }
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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