mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 14:55:26 +00:00
3ff758877f
When encountering `-> Trait`, suggest `-> Box<dyn Trait>` (instead of `-> Box<Trait>`. If there's a single returned type within the `fn`, suggest `-> impl Trait`.
23 lines
643 B
Plaintext
23 lines
643 B
Plaintext
error[E0746]: return type cannot have an unboxed trait object
|
|
--> $DIR/issue-18107.rs:4:5
|
|
|
|
|
LL | dyn AbstractRenderer
|
|
| ^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
|
|
|
|
help: consider returning an `impl Trait` instead of a `dyn Trait`
|
|
|
|
|
LL | impl AbstractRenderer
|
|
| ~~~~
|
|
help: alternatively, box the return type, and wrap all of the returned values in `Box::new`
|
|
|
|
|
LL ~ Box<dyn AbstractRenderer>
|
|
LL |
|
|
LL | {
|
|
LL | match 0 {
|
|
LL ~ _ => Box::new(unimplemented!())
|
|
|
|
|
|
|
error: aborting due to 1 previous error
|
|
|
|
For more information about this error, try `rustc --explain E0746`.
|