diff options
Diffstat (limited to 'tests/ui/error-codes/E0746.stderr')
| -rw-r--r-- | tests/ui/error-codes/E0746.stderr | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/tests/ui/error-codes/E0746.stderr b/tests/ui/error-codes/E0746.stderr index 2153b59ad..9fe90ab7b 100644 --- a/tests/ui/error-codes/E0746.stderr +++ b/tests/ui/error-codes/E0746.stderr @@ -4,11 +4,14 @@ error[E0746]: return type cannot have an unboxed trait object LL | fn foo() -> dyn Trait { Struct } | ^^^^^^^^^ doesn't have a size known at compile-time | - = 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 Trait` as the return type, as all return paths are of type `Struct`, which implements `Trait` +help: return an `impl Trait` instead of a `dyn Trait`, if all returned values are the same type | LL | fn foo() -> impl Trait { Struct } - | ~~~~~~~~~~ + | ~~~~ +help: box the return type, and wrap all of the returned values in `Box::new` + | +LL | fn foo() -> Box<dyn Trait> { Box::new(Struct) } + | ++++ + +++++++++ + error[E0746]: return type cannot have an unboxed trait object --> $DIR/E0746.rs:11:13 @@ -16,11 +19,18 @@ error[E0746]: return type cannot have an unboxed trait object LL | fn bar() -> dyn Trait { | ^^^^^^^^^ doesn't have a size known at compile-time | - = 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 Trait` as the return type, as all return paths are of type `{integer}`, which implements `Trait` +help: return an `impl Trait` instead of a `dyn Trait`, if all returned values are the same type | LL | fn bar() -> impl Trait { - | ~~~~~~~~~~ + | ~~~~ +help: box the return type, and wrap all of the returned values in `Box::new` + | +LL ~ fn bar() -> Box<dyn Trait> { +LL | if true { +LL ~ return Box::new(0); +LL | } +LL ~ Box::new(42) + | error: aborting due to 2 previous errors |