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error[E0746]: return type cannot have an unboxed trait object
--> $DIR/issue-91803.rs:3:43
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LL | fn or<'a>(first: &'static dyn Foo<'a>) -> dyn Foo<'a> {
| ^^^^^^^^^^^ doesn't have a size known at compile-time
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= note: for information on `impl Trait`, see <https://doc.rust-lang.org/book/ch10-02-traits.html#returning-types-that-implement-traits>
help: use `impl Foo<'a>` as the return type, as all return paths are of type `Box<_>`, which implements `Foo<'a>`
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LL | fn or<'a>(first: &'static dyn Foo<'a>) -> impl Foo<'a> {
| ~~~~~~~~~~~~
error: aborting due to previous error
For more information about this error, try `rustc --explain E0746`.
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