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error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/issue-38604.rs:14:13
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LL | let _f: Box<dyn Foo> =
| ^^^^^^^^^^^^ `Foo` cannot be made into an object
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note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/issue-38604.rs:2:22
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LL | trait Foo where u32: Q<Self> {
| --- ^^^^^^^ ...because it uses `Self` as a type parameter
| |
| this trait cannot be made into an object...
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/issue-38604.rs:15:9
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LL | Box::new(());
| ^^^^^^^^^^^^ `Foo` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/issue-38604.rs:2:22
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LL | trait Foo where u32: Q<Self> {
| --- ^^^^^^^ ...because it uses `Self` as a type parameter
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn Foo>>` for `Box<()>`
= note: required by cast to type `Box<dyn Foo>`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0038`.
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