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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 | enum Foo<U> { FooSome(U), FooNone }
| - required by this bound in `Foo`
LL | fn foo1<T>() { not_sized::<Foo<T>>() } // Hunky dory.
LL | fn foo2<T: ?Sized>() { not_sized::<Foo<T>>() }
| - ^^^^^^ doesn't have a size known at compile-time
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| this type parameter needs to be `std::marker::Sized`
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= help: the trait `std::marker::Sized` is not implemented for `T`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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