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error[E0038]: the trait `X` is not dyn compatible
--> $DIR/bounds.rs:7:15
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LL | fn f() -> Box<dyn X<U = u32>> {
| ^^^^^^^^^^^^^^ `X` 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/bounds.rs:4:13
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LL | trait X {
| - this trait is not dyn compatible...
LL | type U: PartialEq<Self>;
| ^^^^^^^^^^^^^^^ ...because it uses `Self` as a type parameter
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0038`.
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