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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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help: consider returning an `impl Trait` instead of a `dyn Trait`
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LL - fn or<'a>(first: &'static dyn Foo<'a>) -> dyn Foo<'a> {
LL + fn or<'a>(first: &'static dyn Foo<'a>) -> impl Foo<'a> {
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help: alternatively, box the return type, and wrap all of the returned values in `Box::new`
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LL | fn or<'a>(first: &'static dyn Foo<'a>) -> Box<dyn Foo<'a>> {
| ++++ +
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0746`.
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