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error[E0746]: return type cannot have an unboxed trait object
--> $DIR/E0746.rs:8:13
|
LL | fn foo() -> dyn Trait { Struct }
| ^^^^^^^^^ 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 foo() -> impl Trait { Struct }
| ~~~~
help: alternatively, box the return type, and wrap all of the returned values in `Box::new`
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LL | fn foo() -> Box<dyn Trait> { Box::new(Struct) }
| ++++ + +++++++++ +
error[E0746]: return type cannot have an unboxed trait object
--> $DIR/E0746.rs:11:13
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LL | fn bar() -> dyn Trait {
| ^^^^^^^^^ doesn't have a size known at compile-time
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= help: if there were a single returned type, you could use `impl Trait` instead
help: box the return type, and wrap all of the returned values in `Box::new`
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LL ~ fn bar() -> Box<dyn Trait> {
LL | if true {
LL ~ return Box::new(0);
LL | }
LL ~ Box::new(42)
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error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0746`.
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