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error[E0038]: the trait `X` is not dyn compatible
--> $DIR/cg-in-dyn-issue-128176.rs:12:24
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LL | fn f2<'a>(arg: Box<dyn X<Y<1> = &'a ()>>) {}
| ^^^^^^^^^^^^^^^^^^^^ `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/cg-in-dyn-issue-128176.rs:8:10
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LL | trait X {
| - this trait is not dyn compatible...
LL | type Y<const N: i16>;
| ^ ...because it contains the generic associated type `Y`
= help: consider moving `Y` to another trait
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0038`.
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