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error[E0038]: the trait `Foo` is not dyn compatible
--> $DIR/issue-38604.rs:14:21
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LL | let _f: Box<dyn Foo> =
| ^^^ `Foo` is not dyn compatible
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note: for a trait to be dyn compatible it needs to allow building a vtable
for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
--> $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 is not dyn compatible...
= help: only type `()` implements `Foo`; consider using it directly instead.
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0038`.
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