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error: this `Deref` implementation is covered by an implicit supertrait coercion
--> $DIR/deref-upcast-behavioral-change.rs:17:1
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LL | impl<'a> Deref for dyn Foo + 'a {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `dyn Foo` implements `Deref<Target = dyn Bar<u32>>` which conflicts with supertrait `Bar<i32>`
...
LL | type Target = dyn Bar<u32> + 'a;
| -------------------------------- target type is a supertrait of `dyn Foo`
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #89460 <https://github.com/rust-lang/rust/issues/89460>
note: the lint level is defined here
--> $DIR/deref-upcast-behavioral-change.rs:1:9
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LL | #![deny(deref_into_dyn_supertrait)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error
|
